含柔性垫层的刚性挡土墙土压力计算方法
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作者单位:

1.山西工程技术学院 土木工程系;2.太原理工大学土木工程学院

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TU476.4

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Calculation Method for Lateral Earth Pressure on Rigid Retaining Wall with Flexible Cushion
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1.Shanxi Institute of Technology;2.College of Civil Engineering,Taiyuan University of Technology,Taiyuan

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    摘要:

    在刚性挡土墙与填土之间设置柔性垫层可减小作用于挡土墙的土压力,但目前针对设置EPS的刚性挡土墙仍缺乏相应的土压力计算方法。将EPS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,得出了设置EPS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压缩量未知的情况下求解土压力,即可应用工程设计阶段。随后,建立一系列FLAC3D有限差分数值模型,验证所得出的理论解,并对EPS垫层减载效果进行分析。结果表明:所推导的墙后设置EPS垫层的刚性挡土墙土压力理论解具有较好的合理性。EPS减小土压力的效果随着EPS的厚度的增加而增强,随着EPS的弹性模量的增加而减弱。

    Abstract:

    The installation of 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, 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 the EPS inclusion. The advantage of the proposed method is that it can be used to solve the earth pressure when the EPS compression is unknown, in other words, the proposed method can be used for the engineering design. A series of FLAC3D finite difference numerical models is established to verify the proposed method and analyze the load reduction effect of EPS inclusions. The results showed that the proposed theoretical solutions are in preferably consistency with the numerical results. The effect of EPS on reducing the earth pressure increases with the increase of the thickness of EPS inclusions, and decreases with the increase of the elastic modulus of EPS inclusions.

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历史
  • 收稿日期:2023-02-22
  • 最后修改日期:2023-04-04
  • 录用日期:2023-04-21
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