阅读说明：本技术 路堑地段无砟轨道抗上拱路基结构、施工及设计方法 (Anti-arching roadbed structure of ballastless track of cutting section, construction method and design method ) 是由 周和祥 余雷 吴沛沛 李宁 付铭川 周成 胡超 曾永红 龚建辉 肖昌睿 陈伟志 于 2020-06-29 设计创作，主要内容包括：本发明涉及路基工程领域,特别是路堑地段无砟轨道抗上拱路基结构、施工及设计方法,其中,路基结构包括沿线路纵向设置的承载板,所述承载板两侧分别连接有竖向设置的立臂板,所述立臂板用于阻挡路堑对应侧的边坡土体,所述承载板的至少一侧伸出对应的所述立臂板,并伸入对应侧的所述边坡土体中,所述承载板连接有预应力锚索,所述预应力锚索底部伸入持力层中,所述承载板底部设置有弹性压缩层,至少一个所述预应力锚索贯穿所述弹性压缩层。本发明所述的一种路堑地段无砟轨道抗上拱路基结构,能够有效控制软岩深路堑地段无砟轨道路堑地段上拱变形,同时保证边坡稳定,以满足高速铁路对线路平顺性和边坡稳定性的要求。(The invention relates to the field of roadbed engineering, in particular to an anti-arching roadbed structure of a ballastless track of a cutting section, construction and a design method, wherein the roadbed structure comprises a bearing plate arranged along the longitudinal direction of a line, two sides of the bearing plate are respectively connected with a vertical arm plate which is arranged vertically, the vertical arm plate is used for blocking a side slope soil body on the corresponding side of the cutting, at least one side of the bearing plate extends out of the corresponding vertical arm plate and extends into the side slope soil body on the corresponding side, the bearing plate is connected with prestressed anchor cables, the bottoms of the prestressed anchor cables extend into a bearing layer, the bottom of the bearing plate is provided with an elastic compression layer, and at least one prestressed anchor cable penetrates through the elastic compression layer. The cut section anti-arching roadbed structure of the ballastless track of the cut section can effectively control the arching deformation of the cut section of the ballastless track of the soft rock deep cut section, and simultaneously ensures the stability of the side slope so as to meet the requirements of a high-speed railway on the smoothness of the line and the stability of the side slope.)

1. The utility model provides an anti hunch road bed structure that goes up of cutting ground section ballastless track, a serial communication port, include along loading board (1) of the vertical setting of circuit, loading board (1) both sides are connected with arm plate (2) of founding of vertical setting respectively, arm plate (2) are used for blockking side slope soil body (6) that the cutting corresponds the side, at least one side of loading board (1) is stretched out and is corresponded arm plate (2) of founding to stretch into corresponding side in the side slope soil body (6), loading board (1) are connected with prestressed anchorage cable (5), prestressed anchorage cable (5) bottom is stretched into and is held in strength layer (8), loading board (1) bottom is provided with elastic compression layer (4), at least one prestressed anchorage cable (5) run through elastic compression layer (4).

2. The cut segment ballastless track anti-arching roadbed structure of claim 1, wherein both sides of the bearing plate (1) extend out of the corresponding vertical arm plate (2) and into the side slope soil body (6) on the corresponding side.

3. The cut segment ballastless track anti-arching roadbed structure of claim 2, wherein the bearing plate (1) and the vertical arm plate (2) are an integrally cast structural member.

4. The cut segment ballastless track anti-arching roadbed structure of claim 1, wherein the elastic compression layer (4) is adapted to the bearing plate (1), and all the prestressed anchor cables (5) penetrate through the elastic compression layer (4).

5. The cut segment ballastless track anti-arching roadbed structure according to claim 4, wherein the elastic compression layer (4) is a structural member made of rubber plate, SBS modified asphalt plate or polystyrene foam plate, and the compression modulus of the elastic compression layer (4) is lower than that of the arching soft rock layer (7).

6. The cut segment ballastless track anti-arching roadbed structure of any one of claims 1 to 5, wherein the number of the prestressed anchor cables (5) is a plurality, and at least one prestressed anchor cable (5) is connected with a part of the bearing plate (1) extending out of the vertical arm plate (2).

7. A construction method for forming an arch-resisting roadbed structure of the ballastless track of the cutting section according to any one of claims 1 to 6, which is characterized by comprising the following steps:

A1. excavating cutting slopes in a grading manner, and excavating slope toe of the slopes to the elevation of the bearing plate (1);

A2. leveling a substrate, longitudinally digging a groove on the substrate, and laying the elastic compression layer (4) in the groove;

A3. the bearing plate (1) and the vertical arm plate (2) are constructed on the elastic compression layer (4), and a cable hole for installing the prestressed anchor cable (5) is reserved on the bearing plate (1);

A4. applying a prestressed anchor cable (5), performing pressure grouting on the part of the prestressed anchor cable (5) extending into the bearing layer (8), and tensioning the prestressed anchor cable (5) after the grout is solidified;

A5. and backfilling and compacting the side slope soil body (6) of the bearing plate (1) extending out of the upper part of the vertical arm plate (2) in a layered manner.

8. The construction method according to claim 7, wherein the step A3 is specifically as follows:

A31. erecting a construction template on the elastic compression layer (4);

A32. placing a steel reinforcement cage of the bearing plate (1) and a steel reinforcement cage of the vertical arm plate (2) in the construction template, connecting a main rib of the bearing plate (1) and a main rib of the vertical arm plate (2) by welding, determining the position of each prestressed anchor cable (5), and reserving a cable hole for installing the prestressed anchor cable (5);

A33. and pouring concrete in the construction template to form the bearing plate (1) and the vertical arm plate (2).

9. A method for designing an anti-arching roadbed structure of a cutting section ballastless track is characterized by comprising the following steps:

s1, establishing a roadbed structure design model based on the structural form and the size parameters of the arch-up resisting roadbed structure of the ballastless track of the cutting section according to any one of claims 1 to 6;

s2, deadweight G of soil body_SInputting the roadbed structure design model, outputting the minimum design parameter of the single prestressed anchor cable (5), and selecting the final size parameter of the prestressed anchor cable (5) according to the minimum design parameter, wherein the self weight G of the soil body_SThe weight of the soil body of the side slope soil body (6) borne by the bearing plate (1) is measured along the longitudinal direction of the line every linear meter.

10. The design method according to claim 9, wherein step S2 is specifically:

s21, establishing a side slope soil body model according to the side slope size of the cutting section, and enabling the side slope soil body model to meet the following requirements: when the depth of the bearing plate (1) extending into the side slope soil body (6) is input, the self weight G of the soil body is output_S，

S22, weighting the soil body G_SInputting the roadbed structure design model and outputting the minimum design parameters of the single pre-stressed anchor cable (5);

and S23, selecting the final size parameter of the prestressed anchor cable (5) according to the minimum design parameter.

Technical Field

The invention relates to the field of roadbed engineering, in particular to an arch-up resisting roadbed structure of a cutting section ballastless track, construction and a design method.

Background

With the rapid development of the high-speed railway in China, a soft rock deep cutting section is inevitably encountered in the process of construction, the soft rock deep cutting section comprises a foundation and side slope soil bodies on two sides of the foundation, and the foundation comprises an upper arch soft rock layer and a supporting layer which are arranged from top to bottom. The soft rock generally has the properties of water swelling and unloading rheology, and the soft rock can cause the occurrence of roadbed upwarp diseases to a certain extent, thereby seriously threatening the operation safety of a high-speed railway. And the ballastless track of the high-speed railway has strict control on the deformation of the roadbed, the adjustable quantity of a track fastener is small, and the arching disease is difficult to cure in the operation period.

Disclosure of Invention

The invention aims to: aiming at the existing technology, soft rock generally has the properties of water swelling and unloading rheology, and can seriously threaten the operation safety of a high-speed railway; the ballastless track of the high-speed railway has strict control on deformation of a roadbed and solves the problem of difficulty in arching disease control in an operation period, and the arching-resistant roadbed structure, construction and design method of the ballastless track of the cutting section are provided, so that arching deformation of the cutting section of the ballastless track of the soft rock deep cutting section can be effectively controlled, and meanwhile, the side slope is ensured to be stable, so that the requirements of the high-speed railway on smoothness of the track and the stability of the side slope are met.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides an anti hunch road bed structure that goes up of cutting district ballastless track, includes the loading board that vertically sets up along the circuit, the loading board both sides are connected with the arm plate that stands of vertical setting respectively, it is used for blockking the side slope soil body that the cutting corresponds the side to stand the arm plate, stretch out the correspondence in at least one side of loading board stand the arm plate to stretch into corresponding side in the side slope soil body, the loading board is connected with the prestressed anchorage cable, prestressed anchorage cable bottom stretches into in the holding power layer, the loading board bottom is provided with the elasticity compression layer, at least one the prestressed anchorage cable runs through the elasticity compression layer.

The invention relates to an uplift resisting roadbed structure of a cutting section ballastless track, which comprises bearing plates arranged along the longitudinal direction of a line, wherein two sides of each bearing plate are respectively connected with a vertical arm plate which is arranged vertically, each vertical arm plate is used for blocking a side slope soil body on the corresponding side of a cutting so as to ensure the stability of a side slope, at least one side of each bearing plate extends out of the corresponding vertical arm plate and extends into the side slope soil body on the corresponding side, the self-weight back pressure of the side slope soil bodies on the two sides of the cutting can be fully utilized, and the uplift resisting capability of the roadbed structure of the scheme is further enhanced; the bottom of the bearing plate is provided with an elastic compression layer, and a certain amount of upward arching allowance is reserved through the elastic compression layer, so that the influence of upward arching of an upward arching soft rock layer on a ballastless track is greatly reduced; the bearing plate is connected with prestressed anchor cables, the bottoms of the prestressed anchor cables extend into the bearing layer, at least one prestressed anchor cable penetrates through the elastic compression layer, and the anti-arching capacity of the structure can be greatly improved by using the tensile force of the anchor cables.

In conclusion, the cut arch-resisting roadbed structure of the cutting section ballastless track can effectively control the cut arch-up deformation of the soft rock deep cutting section ballastless track, and simultaneously ensure the stability of the side slope, so as to meet the requirements of a high-speed railway on the smoothness of the track and the stability of the side slope.

Preferably, the two sides of the bearing plate extend out of the corresponding vertical arm plates and extend into the side slope soil body on the corresponding side.

Preferably, the bearing plate and the vertical arm plate are structural members formed by casting integrally.

The bearing plate, the vertical arm plate and the wing plate are poured into a whole, so that the sealing performance of the structure is improved, and the base upper arch caused by water environment change can be effectively reduced.

Preferably, the elastic compression layer is matched with the bearing plate, the area of the elastic compression layer corresponds to that of the bearing plate, the bottom of the bearing plate is prevented from being in direct contact with the upper arch soft rock layer, and the influence of the upper arch soft rock layer on the ballastless track is better eliminated.

Preferably, the elastic compression layer comprises a plurality of elastic compression layer units, and all the elastic compression layer units are arranged at intervals along the line in the transverse direction.

Preferably, the elastic compression layer is a structural member made of a rubber plate, an SBS modified asphalt plate or a polystyrene foam plate, and the compression modulus of the elastic compression layer is lower than that of the upper soft rock layer.

Preferably, the thickness of the elastic compression layer is 0.4-0.6m, and under the existing standard design condition, the thickness of the elastic compression layer is 0.4-0.6m, so that the energy dissipation requirement can be met, the elastic compression layer is not wasted, and the cost performance is highest.

Preferably, the number of the prestressed anchor cables is a plurality, and at least one prestressed anchor cable is connected with the part of the bearing plate extending out of the vertical arm plate.

The prestressed anchor cables are arranged, and at least one prestressed anchor cable is connected with the part of the bearing plate extending out of the vertical arm plate, so that the prestressed anchor cables apply more reasonable pretensioning force on the bearing plate, and the anti-arching capability of the structure can be better improved by utilizing the tensioning force of the anchor cables.

Preferably, the prestressed anchor cables are arranged at intervals.

The application also discloses a construction method for forming the anti-arching roadbed structure of the ballastless track of the cutting section, which comprises the following steps:

A1. excavating cutting slopes in a grading manner, and excavating slope toe of the slope to the elevation of the bearing plate;

A2. leveling a substrate, longitudinally digging a groove on the substrate, and paving the elastic compression layer in the groove;

A3. constructing the bearing plate and the vertical arm plate on the elastic compression layer, and reserving a cable hole for installing the prestressed anchor cable on the bearing plate;

A4. applying a prestressed anchor cable, performing pressure grouting on the part of the prestressed anchor cable extending into the bearing layer, and tensioning the prestressed anchor cable after the slurry is solidified;

A5. and backfilling in layers and compacting the slope soil body of the bearing plate extending out of the upper part of the vertical arm plate part.

The construction method for forming the anti-arching roadbed structure of the cutting section ballastless track has the advantages that the whole construction process is simple, the construction is reasonable, the anti-arching roadbed structure of the cutting section ballastless track can effectively meet the requirements of a high-speed railway on smoothness of a line and stability of a side slope, no extra large-scale mechanical assistance is needed in the whole process, and the construction method is economical and reasonable.

Preferably, the step a3 is specifically:

A31. erecting a construction template on the elastic compression layer,

A32. placing a steel reinforcement cage of the bearing plate and a steel reinforcement cage of the vertical arm plate in the construction template, connecting a main rib of the bearing plate and a main rib of the vertical arm plate by welding, determining the position of each prestressed anchor cable, and reserving cable holes for mounting the prestressed anchor cables;

A33. and pouring concrete in the construction template to form the bearing plate and the vertical arm plate.

The application also discloses a design method of the anti-arching roadbed structure of the ballastless track of the cutting section, which comprises the following steps:

s1, establishing a roadbed structure design model based on the structural form and size parameters of the arch-up resisting roadbed structure of the cutting section ballastless track;

s2, deadweight G of soil body_SInputting the roadbed structure design model, outputting the minimum design parameter of a single prestressed anchor cable, and selecting the final size parameter of the prestressed anchor cable according to the minimum design parameter, wherein the self weight G of the soil body_SThe weight of the soil mass of the slope soil mass borne by the bearing plate is longitudinally every linear meter along the line.

The design method for the anti-arching roadbed structure of the ballastless track of the cutting section can scientifically and reasonably develop the anti-arching design of the arching structure on the ballastless track roadbed, has clear mechanical principle, clear derivation thought and simple calculation process, ensures the stress safety of the structure of the invention, and provides reliable basis for engineering design calculation.

Preferably, step S2 is specifically:

s21, establishing a side slope soil body model according to the side slope size of the cutting section, and enabling the side slope soil body model to meet the following requirements: when the depth of the loading plate extending into the side slope soil body is input, the self weight G of the soil body is output_S，

S22, weighting the soil body G_SInputting the roadbed structure design model and outputting the minimum design parameter of the single prestressed anchor cable;

and S23, selecting the final size parameter of the prestressed anchor cable according to the minimum design parameter.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the cut section anti-arching roadbed structure of the ballastless track of the cut section can effectively control the arching deformation of the cut section of the ballastless track of the soft rock deep cut section, and simultaneously ensures the stability of the side slope so as to meet the requirements of a high-speed railway on the smoothness of the line and the stability of the side slope.

2. According to the anti-arching roadbed structure of the ballastless track of the cutting section, the bearing plate, the vertical arm plate and the wing plate are cast into a whole, so that the sealing performance of the structure is improved, and the arching of the substrate caused by water environment change can be effectively reduced.

3. According to the anti-arching roadbed structure of the ballastless track of the cutting section, the elastic compression layer is matched with the bearing plate, the area of the elastic compression layer corresponds to that of the bearing plate, the bottom of the bearing plate is prevented from being in direct contact with the upper arching soft rock layer, and the influence of the upper arching soft rock layer on the ballastless track is better eliminated

4. According to the anti-arching roadbed structure of the ballastless track of the cutting section, the prestressed anchor cables are arranged, and at least one prestressed anchor cable is connected with the part, extending out of the vertical arm plate, of the bearing plate, so that the pre-tensioning force exerted on the bearing plate by the prestressed anchor cables is more reasonable, and the anti-arching capability of the structure can be better improved by using the tensile force of the anchor cables.

5. The construction method for forming the anti-arching roadbed structure of the cutting section ballastless track has the advantages that the whole construction process is simple, the construction is reasonable, the anti-arching roadbed structure of the cutting section ballastless track can effectively meet the requirements of a high-speed railway on smoothness of a line and stability of a side slope, no extra large-scale mechanical assistance is needed in the whole process, and the construction method is economical and reasonable.

6. The design method for the anti-arching roadbed structure of the ballastless track of the cutting section can scientifically and reasonably develop the anti-arching design of the arching structure on the ballastless track roadbed, has clear mechanical principle, clear derivation thought and simple calculation process, ensures the stress safety of the structure of the invention, and provides reliable basis for engineering design calculation.

Drawings

Fig. 1 is a structural schematic view (cross section) of an anti-arching roadbed structure of a cutting section ballastless track of the invention.

Fig. 2 is a structural schematic view (overlooking) of an arch-resisting roadbed structure of a cutting section ballastless track of the invention.

Icon: 1-a carrier plate; 2-arm standing plate; 3-wing plate; 4-an elastically compressible layer; 5-prestressed anchorage cable; 6-side slope soil body; 7-upper arch soft rock stratum; 8-a support layer; 9-ballastless track.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.