阅读说明：本技术 雨期时软基地区的路基施工方法 (Roadbed construction method for soft foundation area in rainy period ) 是由 朱松 苗闫闫 崔松明 肖帅 方吉 于 2019-09-09 设计创作，主要内容包括：本发明提出了一种雨期时软基地区的路基施工方法,其特征在于,包括：步骤一：进行软基处理；步骤二：设置排水垫层；步骤三：在所述排水垫层上侧铺设硬质石料；步骤四：在所述硬质石料上铺设海砂；步骤五：在所述海砂铺设完成后,通过高压水枪对所述海砂进行浇水；步骤六：通过振动压路机对铺设所述海砂后的硬质石料进行碾压；步骤七：对所述硬质石料的孔隙率进行检测,当所述孔隙率小于25％时,停止碾压；步骤八：重复所述步骤三-七,直至填筑到下路堤顶为止。可以看出,采用上述雨期时软基地区的路基施工方法进行路基施工,成功地解决了软基地区雨期路基填筑的难题,大大节约了成本,加快了施工效率。(The invention provides a roadbed construction method in a soft foundation area in a rainy period, which is characterized by comprising the following steps: the method comprises the following steps: carrying out soft foundation treatment; step two: arranging a drainage cushion layer; step three: paving hard stones on the upper side of the drainage cushion layer; step four: paving sea sand on the hard stone; step five: after the sea sand is laid, watering the sea sand by a high-pressure water gun; step six: rolling the hard stone materials on which the sea sand is laid by a vibratory roller; step seven: detecting the porosity of the hard stone, and stopping rolling when the porosity is less than 25%; step eight: and repeating the third step to the seventh step until the top of the embankment is filled. Therefore, the roadbed construction method in the soft foundation area in the rainy period is adopted to carry out roadbed construction, the difficult problem of roadbed filling in the soft foundation area in the rainy period is successfully solved, the cost is greatly saved, and the construction efficiency is accelerated.)

1. A roadbed construction method for a soft foundation area in a rainy period is characterized by comprising the following steps:

the method comprises the following steps: carrying out soft foundation treatment;

step two: arranging a drainage cushion layer;

step three: paving hard stones on the upper side of the drainage cushion layer;

step four: paving sea sand on the hard stone;

step five: after the sea sand is laid, watering the sea sand by a high-pressure water gun;

step six: rolling the hard stone materials on which the sea sand is laid by a vibratory roller;

step seven: detecting the porosity of the hard stone, and stopping rolling when the porosity is less than 25%;

step eight: repeating the third step to the seventh step until the third step and the seventh step are filled to the top of the embankment on the lower road;

step nine: filling the sea sand layer by layer until the sea sand reaches a preset overload elevation, wherein the compaction degree of the sea sand is more than 90%;

step ten: after the subgrade is settled and stabilized, removing the sea sand above the top of the roadbed;

step eleven: compacting the sea sand on the top of the roadbed by a road roller;

step twelve: paving a layer of impermeable geotextile on the top of the road bed;

step thirteen: and carrying out construction of a pavement structure layer.

2. The method of constructing a roadbed in a soft foundation region during a rainy period according to claim 1, wherein in the step one, the soft foundation treatment is performed according to design requirements.

3. The roadbed construction method of the soft foundation region in the rainy period as claimed in claim 1, wherein the drainage cushion layer is laid on the soft foundation by using crushed stones with the particle size of 0-50mm, the laying thickness of the drainage cushion layer is 300-500mm, and the laying width exceeds the design sideline by 300-600 mm.

4. The method of constructing a roadbed in a soft foundation region during a rainy period according to claim 3, wherein the drainage mat layer is compacted after the drainage mat layer is laid.

5. The method of constructing a roadbed in a soft foundation area during a rainy period as claimed in claim 1, wherein the grain size of the hard stone is 400mm or less, the thickness of the hard stone to be laid is 600mm or less, and the hard stone is leveled by a bulldozer after the hard stone is laid.

6. The method of constructing a roadbed in a soft foundation area during a rainy period according to claim 1, wherein the thickness of the laid sea sand is 50 to 150mm, and the sea sand is leveled by a leveler after the sea sand is laid.

7. The method as claimed in claim 1, wherein the area of the sea sand is 1500-2000 m/watering area when the high pressure water gun is used to water the sea sand²。

8. The method of constructing a roadbed in a soft foundation region during a rainy period according to claim 1, wherein the hard stone material after the sea sand is laid is kept in a wet state while being crushed by a vibration roller.

9. The method of constructing a roadbed in a soft foundation area during a rainy period according to claim 1, wherein in the step ten, the sea sand on the top of the roadbed is removed when the settlement of the roadbed is less than 9mm for 2 consecutive months per month.

10. The method of constructing a roadbed in a soft foundation region in a rainy period according to claim 1, wherein the sea sand on the top of the roadbed is compacted by the roller, and the compaction degree of the sea sand is equal to or greater than a specification requirement.

Technical Field

The invention relates to the technical field of highway engineering, in particular to a roadbed construction method in a soft foundation area in a rainy period.

Background

At present, when a road is constructed, when the road passes through a plain area and a low-hill area, part of road sections to be constructed are marshland and excavation sections, soil resources around the place where the road to be constructed is located are deficient, and meanwhile, when the duration of rainy seasons of the area where the road to be constructed is located is long, the construction difficulty is increased. Therefore, how to carry out roadbed filling construction of the highway in the rainy period becomes a problem to be solved urgently.

Disclosure of Invention

In view of the above, the invention provides a roadbed construction method in a soft foundation area in a rainy period, and aims to solve the problem that roadbed filling cannot be performed in the soft foundation area in a rainy season.

In one aspect, the invention provides a roadbed construction method in a soft foundation area in a rainy period, which is characterized by comprising the following steps:

the method comprises the following steps: carrying out soft foundation treatment;

step two: arranging a drainage cushion layer;

step three: paving hard stones on the upper side of the drainage cushion layer;

step four: paving sea sand on the hard stone;

step five: after the sea sand is laid, watering the sea sand by a high-pressure water gun;

step six: rolling the hard stone materials on which the sea sand is laid by a vibratory roller;

step seven: detecting the porosity of the hard stone, and stopping rolling when the porosity is less than 25%;

step eight: repeating the third step to the seventh step until the third step and the seventh step are filled to the top of the embankment on the lower road;

step nine: filling the sea sand layer by layer until the sea sand reaches a preset overload elevation, wherein the compaction degree of the sea sand is more than 90%;

step ten: after the subgrade is settled and stabilized, removing the sea sand above the top of the roadbed;

step eleven: compacting the sea sand on the top of the roadbed by a road roller;

step twelve: paving a layer of impermeable geotextile on the top of the road bed;

step thirteen: and carrying out construction of a pavement structure layer.

Further, in the first step, the soft foundation treatment is carried out according to design requirements.

Further, the drainage cushion layer is paved on the soft foundation by adopting crushed stones with the particle size of 0-50mm, the paving thickness of the drainage cushion layer is 300-600mm, and the paving width exceeds the designed sideline by 300-600 mm.

Further, after the drainage cushion layer is paved, the drainage cushion layer is compacted.

Further, the grain size of the hard stones is less than or equal to 400mm, the paving thickness of the hard stones is less than or equal to 600mm, and the hard stones are leveled by a bulldozer after the paving of the hard stones is completed.

Further, the laying thickness of the sea sand is 50-150mm, and the sea sand is leveled by a grader after the sea sand is laid.

Further, when the sea sand is watered by a high-pressure water gun, the watering area is 1500-2000m²。

Further, when the hard stone material paved with the sea sand is rolled by a vibratory roller, the hard stone material is kept in a wet state.

Further, in the step ten, when the settlement of the roadbed is less than 9mm every month for 2 consecutive months, removing the sea sand on the top of the roadbed.

Further, when the sea sand on the top of the road bed is compacted by the road roller, the compaction degree of the sea sand is more than or equal to the specification requirement.

Compared with the prior art, the invention has the beneficial effects that the drainage cushion layer is arranged on the soft base layer, the hard stone layer is laid on the upper side of the drainage cushion layer, and the sea sand is filled above the hard stone layer, so that the sea sand is filled into the gaps of stones of the hard stone layer, the structural stability of the hard stone layer is enhanced, and the stability of the roadbed is improved. After the sea sand is paved on the hard stone materials through the sea sand, a plurality of sea sand filling layers are arranged, overload prepressing is carried out, after the prepressing is finished, the sea sand on the top of the roadbed is compacted through a road roller, and a pavement structure layer is constructed after the roadbed is settled stably. Therefore, the roadbed construction method in the soft foundation area in the rainy period is adopted to carry out roadbed construction, the difficult problem of roadbed filling in the soft foundation area in the rainy period is successfully solved, the cost is greatly saved, and the construction efficiency is accelerated.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a flowchart of a roadbed construction method in a soft foundation area in a rainy period according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, the embodiment provides a roadbed construction method in a soft foundation area in a rainy period, which includes the following steps:

step one, S101: carrying out soft foundation treatment;

step two S102: arranging a drainage cushion layer;

step three, S103: paving hard stones on the upper side of the drainage cushion layer;

step four S104: paving sea sand on the hard stone;

step five S105: after the sea sand is laid, watering the sea sand by a high-pressure water gun;

step six S106: rolling the hard stone materials on which the sea sand is laid by a vibratory roller;

step seven S107: detecting the porosity of the hard stone, and stopping rolling when the porosity is less than 25%;

step eight S108: repeating the third step S103 to the seventh step S107 until the top of the embankment is filled;

step nine S109: filling the sea sand layer by layer until the sea sand reaches a preset overload elevation, wherein the compaction degree of the sea sand is more than 90%;

step ten S110: after the subgrade is settled and stabilized, removing the sea sand above the top of the roadbed;

step eleven S111: compacting the sea sand on the top of the roadbed by a road roller;

step twelve S112: paving a layer of impermeable geotextile on the top of the road bed;

step thirteen S113: and carrying out construction of a pavement structure layer.

Specifically, in step S101, the soft foundation processing is performed according to design requirements. That is, the soft base course of the road is first processed, and when the soft base course is processed, the soft base course is processed according to the predetermined design requirement.

Specifically, the second step S102: when the drainage cushion is arranged, the concrete implementation of the drainage cushion is that crushed stones with the particle size of 0-50mm are adopted to be paved on the soft foundation, the paving thickness of the drainage cushion is 300-600mm, and the paving width exceeds the design sideline 300-600 mm. Specifically, during construction drainage bed course, drainage bed course adopts 0-37.5 mm's gravel material to lay, and the thickness of paving of gravel material is 300 and supplyes 500mm, and the width of paving respectively widens design sideline 500 mm. After paving of the crushed stones, the crushed stones are properly compacted.

Specifically, the drainage mat is compacted after the drainage mat is laid, that is, the crushed stones are properly compacted after the paving of the crushed stones is completed.

Specifically, step three, S103: and paving hard stones on the upper side of the drainage cushion layer, wherein in specific implementation, the grain diameter of the hard stones is less than or equal to 400mm, the paving thickness of the hard stones is less than or equal to 600mm, and after the hard stones are paved, leveling the hard stones by using a bulldozer. Namely, the hard stone is paved on the drainage cushion layer, the grain diameter of the stone is not more than 400mm, the paving thickness is not more than 600mm, and the hard stone is leveled by a bulldozer.

Specifically, in step four S104: and in the process of paving the sea sand on the hard stone material, the paving thickness of the sea sand is 50-150mm, and a grader is used for leveling the sea sand after the sea sand is paved.

Specifically, in step five S105: after the sea sand is laid, the sea sand is watered by a high-pressure water gun, and when the sea sand is watered by the high-pressure water gun, the watering area is 1500-2000m2 each time. Concretely, the paved sea sand is watered by a high-pressure water gun, the sea sand is flushed into the gap of the stone material through water power, and the area of each watering is 1500-2000m²Preferably, if the sea sand cannot fill the gaps of the stone, the amount of the sea sand is continuously increased until the sea sand fills the entire gaps of the stone.

Specifically, in step six S106: and during rolling the hard stone material paved with the sea sand by the vibratory roller, keeping the hard stone material in a wet state when rolling the hard stone material paved with the sea sand by the vibratory roller. In particular, the sea sand is filled with hard stonesImmediately rolling the gaps by using a vibratory roller with the weight of more than or equal to 20 tons, wherein the rolling is carried out under the condition that stones are completely wet, otherwise watering is needed, and the rolling area of each section is not more than 2000m under the condition that one roller works²。

Specifically, in step nine S109: and (3) filling the sea sand layer by layer until the sea sand is filled to a preset overload elevation and the compaction degree of the sea sand is more than 90%, paving the sea sand layer by layer on the hard stone material, and carrying out overload prepressing operation once when one layer of the sea sand is paved so as to ensure the compaction degree of each layer of the sea sand.

Specifically, in step ten S110: and after the subgrade is settled and stabilized, removing the sea sand above the top of the roadbed, and removing the sea sand above the top of the roadbed when the settlement of the subgrade is less than 9mm every month for 2 months.

Specifically, in step eleven S111: in the process of compacting the sea sand on the top of the roadbed by the road roller, the compaction degree of the sea sand is more than or equal to the standard requirement when the sea sand on the top of the roadbed is compacted by the road roller, namely, the compaction degree of the sea sand from the embankment to the top of the roadbed can naturally reach or exceed the standard requirement after the roadbed is settled and stabilized under the action of overload compression and rainwater.

Specifically, in step twelve S112: and paving a layer of impermeable geotextile on the top of the roadbed, and paving a layer of impermeable geotextile of 9.5KN on the top of the roadbed.

It can be seen that the roadbed construction method in the soft foundation area in the rainy period

Through set up the drainage bed course on soft basic unit, lay the stereoplasm stone layer at drainage bed course upside to fill sea sand above the stereoplasm stone layer, so that in the gap of the building stones of sea sand filling to the stereoplasm stone layer, with the structural stability of reinforcing stereoplasm stone layer, thereby improved the stability of road bed. After the sea sand is paved on the hard stone materials through the sea sand, a plurality of sea sand filling layers are arranged, overload prepressing is carried out, after the prepressing is finished, the sea sand on the top of the roadbed is compacted through a road roller, and a pavement structure layer is constructed after the roadbed is settled stably. Therefore, the roadbed construction method in the soft foundation area in the rainy period is adopted to carry out roadbed construction, the difficult problem of roadbed filling in the soft foundation area in the rainy period is successfully solved, the cost is greatly saved, and the construction efficiency is accelerated.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.