阅读说明：本技术 一种土质地基路肩桩板墙加固结构及设计方法 (Soil foundation road shoulder pile slab wall reinforcing structure and design method ) 是由 姚裕春 王晓刚 刘昕 袁碧玉 张良 罗强 钱昊 李准 陈雅婷 于 2020-06-15 设计创作，主要内容包括：本发明公开了一种土质地基路肩桩板墙加固结构及设计方法,包括加固件、路堤工程和桩板墙结构；桩板墙结构包括至少两个加固桩,至少两个加固桩沿线路纵向间隔设置在地基中,加固件埋设在加固桩一侧的地基中,路堤工程分层填筑在加固桩另一侧的地基上。在加固桩桩前设置加固件从而增加加固桩桩前的地基土水平抗力,可以有效控制加固桩的水平变形、减小加固桩的设置深度,施工简单安全且经济性好,确定复合桩基设置的平面位置和深度范围,可以有效提高复合桩基的利用效率,复合桩基的设置深度为复合桩基加固前的变形影响区深度,能确保加固桩的抗变形能力具有足够的安全储备,具有施工简单、安全、经济性好的特点。(The invention discloses a soil texture foundation road shoulder pile slab wall reinforcing structure and a design method, wherein the soil texture foundation road shoulder pile slab wall reinforcing structure comprises a reinforcing member, an embankment project and a pile slab wall structure; the pile slab wall structure comprises at least two reinforcing piles, the at least two reinforcing piles are arranged in a foundation at intervals along a longitudinal line, reinforcing members are buried in the foundation on one side of the reinforcing piles, and embankment engineering is filled on the foundation on the other side of the reinforcing piles in a layered mode. Thereby set up the reinforcement before the stake of reinforcement stake and increase the resistance of foundation soil level before the stake of reinforcement stake, can the horizontal deformation of effective control reinforcement stake, reduce the depth of setting up of reinforcement stake, the simple safety and economic nature of construction are good, confirm the plane position and the degree of depth scope that composite pile foundation set up, can effectively improve composite pile foundation's utilization efficiency, composite pile foundation's the depth of setting up is the deformation influence zone degree of depth before the composite pile foundation consolidates, the anti deformability that can ensure the reinforcement stake has sufficient safe deposit, and the construction is simple, safety, economic nature is good characteristics.)

1. A soil texture road shoulder pile slab wall reinforcing structure is characterized by comprising a reinforcing member (4), an embankment project (3) and a pile slab wall structure;

the pile-plate wall structure comprises at least two reinforcing piles (1), wherein the at least two reinforcing piles (1) are longitudinally arranged in a foundation at intervals along a line, and the reinforcing members (4) are buried in the foundation on one side of each reinforcing pile (1);

and the embankment project (3) is filled on the foundation on the other side of the reinforcing pile (1) in a layered mode.

2. A soil-based road shoulder pile panel wall reinforcing structure according to claim 1, wherein the top of the reinforcing pile (1) protrudes out of the foundation, and the reinforcing member (4) is buried in the foundation within the width of the section of the reinforcing pile (1).

3. A soil-based road shoulder pile panel wall reinforcing structure according to claim 2, wherein the number of said reinforcing members (4) is at least two, and at least two of said reinforcing members (4) are laid in a row at intervals in a horizontal direction.

4. A soil-based road shoulder pile plate wall reinforcing structure according to claim 3, wherein the pile plate wall structure further comprises at least two retaining plates (2), the retaining plates (2) are located on the foundation behind the reinforcing piles (1), at least two retaining plates (2) are arranged on the foundation behind the reinforcing piles (1) in the vertical direction, and two ends of each retaining plate (2) are respectively connected with the adjacent reinforcing piles (1).

5. A soil-based road shoulder pile panel wall reinforcing structure according to claim 1, wherein the reinforcing member (4) comprises a composite pile foundation, and the composite pile foundation adopts a cement mixing pile or a CFG pile.

6. A design method of a soil texture road shoulder pile plate wall reinforcing structure is characterized by comprising the following steps:

s1: calculating active soil pressure of embankment filling soil behind the curb pile plate wall;

s2: the pile length and the pile section of a reinforced pile (1) in the pile-planning plate wall structure are determined;

s3: calculating the length and the maximum depth of a deformation influence area of the soil foundation in front of the reinforcing pile (1);

s4: constructing a composite pile foundation in a soil foundation deformation influence area before the reinforcing pile (1), and calculating the composite horizontal resistance strength of the soil foundation after the composite pile foundation is reinforced;

s5: according to the composite horizontal resistance strength of the soil foundation before the pile reinforced by the composite pile foundation, the pile width section size of the reinforced pile (1) is not changed, the steps S1 and S2 are repeated, and the final anchoring section length of the reinforced pile (1) is calculated according to the stress judgment standard;

s6: and (3) carrying out structural reinforcement design according to the stress of the reinforcing pile (1).

7. The method of claim 6, wherein in step S1, the formula for calculating the active earth pressure of the embankment filling behind the shoulder pile sheet wall is:

in the formula: in the formula P_aActive soil pressure, gamma is soil volume weight, H fill height, K_aIs the active soil pressure coefficient.

8. The method for designing a soil-based shoulder pile plate wall reinforcing structure according to claim 6, wherein in step S3, the length and the maximum depth of the deformation affected zone of the soil-based foundation before the reinforcing piles (1) are calculated according to the active soil pressure of the embankment filling soil, the geological condition of the foundation, the cantilever height of the reinforcing piles (1) and the size of the reinforcing piles (1);

the judgment standard of the deformation influence area is as follows:

σ_i≤σ_s

in the formula: sigma_iFor calculating the horizontal stress, σ, at the length of the anchor section 1/4 of the reinforcement pile (1)_sThe horizontal resistance strength of the soil foundation;

the calculation formula of the maximum depth of the deformation influence area of the soil foundation in front of the reinforcing pile (1) is as follows:

d_h＝L/4

in the formula: d_hThe maximum depth of the deformation influence of the soil foundation is set, and L is the length of the anchoring section of the reinforcing pile (1);

the calculation formula of the length of the deformation influence area of the soil foundation in front of the reinforcing pile (1) is as follows:

in the formula: s is the length of the deformation influence area of the soil foundation in front of the pile,the internal friction angle of the foundation soil before the pile.

9. The method of claim 8, wherein in step S4, the formula for calculating the composite horizontal resistance strength of the soil foundation after the composite pile foundation is reinforced is:

σ_F＝[mσ_p+(1-m)σ_s].ξ

in the formula: sigma_FHorizontal resistance strength of soil foundation in front of pile after reinforcing composite pile foundation_pThe horizontal resistance strength of the composite pile foundation, m is the area replacement rate of the composite pile foundation, ξ is the deformation incongruous influence coefficient of the composite pile foundation and the soil foundation, generally 0.5-0.8 is taken, and the strength of the natural soil body is large and small.

Technical Field

The invention relates to the field of pile slab wall engineering, in particular to a soil texture road shoulder pile slab wall reinforcing structure and a design method.

Background

The road shoulder pile plate wall has good embankment slope-collecting effect and good anti-seismic performance, and is widely applied to roadbed engineering. The design specification of the railway subgrade retaining structure makes a limiting requirement on the deformation of the reinforcing pile: the deformation control requirement of the pile top is not more than 10cm (6 cm of a high-speed railway), and the deformation of the anchoring point is not more than 1 cm.

The soil foundation sets up road shoulder stake siding wall structure, for the deformation of effective control reinforcing pile, can adopt to reduce reinforcing pile and set up interval, increase reinforcing pile length, increase measures such as the cross-sectional dimension of reinforcing pile, but these measures make the engineering investment of reinforcing pile great to when the pile length of reinforcing pile is darker, construction difficulty, safety risk are big. The reinforcement structure and the design method thereof are of great significance for effectively controlling the deformation of the soil foundation road shoulder pile plate wall and having good economical efficiency and construction safety.

Disclosure of Invention

The invention aims to: aiming at the problems in the prior art, a soil texture road shoulder pile plate wall reinforcing structure and a design method are provided.

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

a soil foundation road shoulder pile slab wall reinforcing structure comprises a reinforcing member, an embankment project and a pile slab wall structure;

the pile-slab wall structure comprises at least two reinforcing piles, the at least two reinforcing piles are longitudinally arranged in the foundation at intervals along a line, and reinforcing members are buried in the foundation on one side of each reinforcing pile;

and the embankment engineering is filled on the foundation on the other side of the reinforcing pile in a layered mode.

Through above-mentioned structure, stake siding wall structure sets up the reinforcement thereby increasing the horizontal resistance of foundation soil before the stake of reinforcement stake including the reinforcement stake before the stake of reinforcement stake, can the horizontal deformation of effective control reinforcement stake, reduce the depth of setting of reinforcement stake, and construction is simple, safety, economic nature are good.

In a preferred embodiment of the present invention, the top of the reinforcing pile extends out of the foundation, and the reinforcing member is embedded in the foundation within the width of the cross section of the reinforcing pile.

In a preferred embodiment of the present invention, the number of the reinforcing members is at least two, and the at least two reinforcing members are embedded in a row at intervals in the horizontal direction.

As a preferable scheme of the present invention, the pile plate wall structure further includes at least two retaining plates, the retaining plates are located on the foundation behind the reinforcing piles, the at least two retaining plates are vertically disposed on the foundation behind the reinforcing piles, and both ends of the retaining plates are respectively connected to adjacent reinforcing piles.

In a preferred embodiment of the present invention, the reinforcement member includes a composite pile foundation, and the composite pile foundation is a soil cement mixing pile or a CFG pile.

A design method of a soil foundation road shoulder pile slab wall reinforcing structure comprises the following steps:

s1: calculating active soil pressure of embankment filling soil behind the curb pile plate wall;

s2: planning the pile length and the pile section of a reinforced pile in a pile slab wall structure;

s3: calculating the length and the maximum depth of a deformation influence area of the soil foundation in front of the reinforcing pile;

s4: constructing a composite pile foundation in a soil foundation deformation influence area before the pile is reinforced, and calculating the composite horizontal resistance strength of the soil foundation after the composite pile foundation is reinforced;

s5: according to the composite horizontal resistance strength of the soil foundation before the pile reinforced by the composite pile foundation, the pile width section size of the reinforced pile is not changed, the steps S1 and S2 are repeated, and the final anchoring section length of the reinforced pile is calculated according to the stress judgment standard;

s6: and carrying out structural reinforcement design according to the stress of the reinforcing pile.

By the method, the plane position and the depth range of the composite pile foundation are determined, the utilization efficiency of the composite pile foundation can be effectively improved, the setting depth of the composite pile foundation is the depth of a deformation influence area before the composite pile foundation is reinforced, the anti-deformation capacity of the reinforcing pile can be guaranteed to have enough safe reserve, the composite pile foundation is set for reducing the setting depth of the reinforcing pile, and the method has the advantages of being simple in construction, safe and good in economical efficiency.

As a preferred embodiment of the present invention, in step S1, the formula for calculating the active soil pressure of the embankment filling soil behind the shoulder pile panel wall is:

in the formula: in the formula P_aActive soil pressure, gamma is soil volume weight, H fill height, K_aIs the active soil pressure coefficient.

As a preferred scheme of the present invention, in step S3, calculating the length and the maximum depth of the deformation affected zone of the soil foundation before the reinforcing pile according to the active soil pressure of the embankment filling soil, the geological condition of the foundation, the cantilever height of the reinforcing pile and the size of the reinforcing pile;

the judgment standard of the deformation influence area is as follows:

σ_i≤σ_s

in the formula: sigma_iFor calculating the horizontal stress, σ, at the length of the stiffening pile anchor section 1/4_sThe horizontal resistance strength of the soil foundation;

the calculation formula of the maximum depth of the deformation influence area of the soil foundation before the reinforcing pile is as follows:

d_h＝L/4

in the formula: d_hThe maximum depth of the soil foundation deformation influence is set, and L is the anchoring section length of the reinforcing pile;

the calculation formula of the length of the deformation influence area of the soil foundation before the reinforcing pile is as follows:

in the formula: s is the length of the deformation influence area of the soil foundation in front of the pile,the internal friction angle of the foundation soil before the pile.

As a preferred embodiment of the present invention, in step S4, the formula for calculating the composite horizontal resistance strength of the soil foundation after the composite pile foundation is reinforced is as follows:

σ_F＝[mσ_p+(1-m)σ_s].ξ

in the formula: sigma_FHorizontal resistance strength of soil foundation in front of pile after reinforcing composite pile foundation_pThe horizontal resistance strength of the composite pile foundation, m is the area replacement rate of the composite pile foundation, ξ is the deformation incongruous influence coefficient of the composite pile foundation and the soil foundation, generally 0.5-0.8 is taken, the strength of the natural soil body is large, and the strength is small;

in the step S5, the ballastless track high-speed railway stress determination standard:

σ_i≤0.3σ_F

the stress judgment standard of the high-speed railway with the ballast track is as follows:

σ_i≤(0.3-0.5)σ_F

the stress judgment standard of the ballast track common speed railway is as follows:

σ_i≤(0.5-0.7)σ_F

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

1. pile board wall structure sets up the reinforcement thereby increasing the horizontal resistance of foundation soil before the stake of reinforcement stake including the reinforcement stake, can the horizontal deformation of effective control reinforcement stake, reduce the depth of setting of reinforcement stake, and the construction is simple safety and economic nature good.

2. The method has the advantages that the method fully considers the deformation uncoordinated influence between the composite pile foundation and the soil foundation, and can meet the judgment standards of ballastless track high-speed railways, ballasted track high-speed railways and ballasted track ordinary speed railways with different deformation control standards.

Drawings

Fig. 1 is a schematic structural view of a soil-based road shoulder pile slab wall reinforcing structure according to the invention.

Fig. 2 is a top view of a soil-based road shoulder pile slab wall reinforcing structure according to the present invention.

Icon: 1-reinforcing piles; 2-a soil retaining plate; 3-embankment engineering; 4-a reinforcement.

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.