Calculation for lateral earth pressure on rigid retaining wall with flexible cushion

LIANG Lisheng; GUO Junyuan; WANG Huifang

doi:10.11835/j.issn.2096-6717.2023.056

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Calculation for lateral earth pressure on rigid retaining wall with flexible cushion

Civil Engineering | 更新时间：2023-11-21

- Calculation for lateral earth pressure on rigid retaining wall with flexible cushion
- Journal of Civil and Environmental Engineering Vol. 45, Issue 6, Pages: 158-164(2023)
- 作者机构：
  
  1.山西工程技术学院土木工程系；矿区生态修复与固废资源化省市共建山西省重点实验室培育基地，山西阳泉 045000
  2.太原理工大学土木工程学院，太原 030024
- 作者简介：
  
  LIANG Lisheng (1972- ), associate professor, main research interest: geotechnical engineering, E-mail: mnliangll_009@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(52008285)
- DOI：10.11835/j.issn.2096-6717.2023.056
  CLC： TU476.4
- Received：22 February 2023，
  
  Published：25 December 2023
- 稿件说明：
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梁利生,郭俊源,王慧芳.含柔性垫层的刚性挡土墙土压力计算方法[J].土木与环境工程学报,2023,45(06):158-164.

LIANG Lisheng,GUO Junyuan,WANG Huifang.Calculation for lateral earth pressure on rigid retaining wall with flexible cushion[J].Journal of Civil and Environmental Engineering,2023,45(06):158-164.
梁利生,郭俊源,王慧芳.含柔性垫层的刚性挡土墙土压力计算方法[J].土木与环境工程学报,2023,45(06):158-164. DOI： 10.11835/j.issn.2096-6717.2023.056.

LIANG Lisheng,GUO Junyuan,WANG Huifang.Calculation for lateral earth pressure on rigid retaining wall with flexible cushion[J].Journal of Civil and Environmental Engineering,2023,45(06):158-164. DOI： 10.11835/j.issn.2096-6717.2023.056.

摘要

在刚性挡土墙与填土之间设置柔性垫层能减小作用于挡土墙的土压力，但目前仍缺乏针对设置聚苯乙烯土工泡沫（EPS）柔性垫层的刚性挡土墙土压力计算方法。将EPS柔性垫层的压缩量视为墙后填土的位移量，考虑挡土墙后土拱效应，基于挡土墙土压力-位移的关系曲线，引入迭代法进行收敛计算，得到设置EPS柔性垫层的刚性挡土墙土压力计算方法。该计算方法的优势是可在EPS柔性垫层压缩量未知的情况下求解土压力，即可应用工程设计阶段。建立FLAC3D有限差分数值模型，对推导的理论解进行验证，并对EPS柔性垫层减载效果进行分析。结果表明：基于土压力-位移关系曲线并采用迭代法得出的墙后设置EPS柔性垫层的刚性挡土墙土压力理论解具有较好的合理性。在EPS柔性垫层弹性模量不变的情况下，EPS柔性垫层减小土压力的效果随着EPS柔性垫层厚度的增加而增强；在EPS柔性垫层厚度一定的情况下，随着EPS柔性垫层弹性模量的增加，其减小土压力的效果逐渐减弱。

Abstract

The installation of polystyrene geofoam (EPS) inclusions between the rigid retaining wall and backfill can reduce the earth pressure acting on the retaining wall. To date

there is a lack of the calculation method for the earth pressure on rigid retaining walls with EPS inclusions. In this study

the compression from geofoam inclusions is equated to the displacement of the backfill

and the soil arching behind the retaining wall is considered. Based on the displacement-dependent earth-pressure model (DDEP)

the iterative method is introduced for the convergence calculation

and then the theoretical solution is obtained to calculate the earth pressure on the rigid retaining wall with EPS inclusion. The advantage of the proposed method is that it can be used to solve the earth pressure when the EPS compression modulus is not provided. A series of FLAC3D numerical models is established to verify the proposed method and analyze the load reduction effect of EPS inclusions. The proposed theoretical solutions based on the DDEP model and iterative method are in preferably consistency with the numerical results. Effect of EPS on reducing the earth pressure increases with increase of the thickness of EPS inclusions when EPS elastic modulus is constant

and decreases with increase of the elastic modulus of EPS inclusions while EPS thickness is constant.

关键词

Keywords

references

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