Numerical simulation analysis and mechanism study of soil cave type ground subsidence

XUE Fenfen; XIE Wanli; WANG Yuchen; LIU Xinpeng

doi:10.16152/j.cnki.xdxbzr.2024-01-010

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Numerical simulation analysis and mechanism study of soil cave type ground subsidence

Engineering Geological Disasters | 更新时间：2024-01-18

- Numerical simulation analysis and mechanism study of soil cave type ground subsidence
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 1, Pages: 84-92(2024)
- 作者机构：
  
  西北大学　地质学系/大陆动力学国家重点实验室/西安市黄土动力灾害防控与地质环境修复重点实验室，陕西　西安　710069
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2024-01-010
  CLC：
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XUE Fenfen, XIE Wanli, WANG Yuchen, et al. Numerical simulation analysis and mechanism study of soil cave type ground subsidence. [J]. Journal of Northwest University (Natural Science Edition) 54(1):84-92(2024)
DOI：

XUE Fenfen, XIE Wanli, WANG Yuchen, et al. Numerical simulation analysis and mechanism study of soil cave type ground subsidence. [J]. Journal of Northwest University (Natural Science Edition) 54(1):84-92(2024) DOI： 10.16152/j.cnki.xdxbzr.2024-01-010.

摘要

以研究区发生的10例地面塌陷为研究对象，在野外调查的基础上结合研究区的地质环境条件和工程地质资料，分析了研究区的基础地质背景及地面塌陷的发育条件，综合归纳了研究区地面塌陷的类型，揭示了不同地面塌陷类型的诱因、时空分布特征及塌陷形成机制。最后，采用有限差分软件FLAC3D模拟了地道开挖、建房、地下水位抬升、强降雨等条件下地面塌陷的发展过程。通过对土层内部的应力应变，以及地道周围土体、地表位移等分析，揭示了研究区地面塌陷的形成机理。研究结果表明，居民建房增加上覆荷载，地下水位抬升引起洞室周围土体变形、洞室扩大，在季节性强降雨的影响下，地表会产生大的沉降。

Abstract

Ten cases of ground subsidence in the study area are taken as the research object. Based on field investigations and combined with the geological environment conditions and engineering geological data of the study area, the basic geological background and ground subsidence development conditions of the study area are obtained. Several types of ground subsidence in the study area are comprehensively summarized, and the causes, spatiotemporal distribution characteristics, and collapse formation mechanisms of different types of ground subsidence are analyzed. The finite difference software FLAC3D was used to simulate the development process of ground collapse under tunnel excavation, building houses, groundwater level rise, and heavy rainfall conditions. The formation mechanism of ground collapse in the study area was obtained by analyzing the stress and strain inside the soil layer, as well as the displacement of the surrounding soil and surface of the tunnel. The research results indicate that the construction of residential buildings increases the overlying load, and the rise of groundwater level causes deformation of the soil around the cavern, leading to the expansion of the cavern. Under the influence of seasonal heavy rainfall, the surface undergoes significant settlement.

关键词

塌陷机理地下水强降雨数值模拟

Keywords

collapsemechanismgroundwaterheavy rainfallnumerical simulation

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