Effect of in-situ stress on stability of underlying karst cave

ZHANG Zhen; CHEN Zhong-da; ZHU Yao-ting; HU Wen-hua; WU Fu-quan; LIU Chao-qun

doi:10.16285/j.rsm.2016.S2.091

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Effect of in-situ stress on stability of underlying karst cave

更新时间：2026-06-25

- Effect of in-situ stress on stability of underlying karst cave
- Vol. 37, Issue S2, Pages: 715-723(2016)
- 作者机构：
  
  1. 长安大学特殊地区公路工程教育部重点实验室,陕西,西安,710064
  2. 江西省交通科学研究院,江西,南昌,330052
  3. 江西省高速公路投资集团有限责任公司,江西,南昌,341000
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.S2.091
  CLC： U416.1+6
- Online First：09 June 2018，
  
  Published：2016
- 稿件说明：
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ZHANG Zhen, CHEN Zhong-da, ZHU Yao-ting, et al. Effect of in-situ stress on stability of underlying karst cave[J]. 2016, 37(S2): 715-723.
DOI：

ZHANG Zhen, CHEN Zhong-da, ZHU Yao-ting, et al. Effect of in-situ stress on stability of underlying karst cave[J]. 2016, 37(S2): 715-723. DOI： 10.16285/j.rsm.2016.S2.091.

摘要

为研究地应力对溶洞稳定性的影响，依据中国大陆地壳应力环境基础数据库及地应力分布规律计算公式建立了地应力模型，并辅以少量的测孔予以验证。基于地应力、Hoek-Brown屈服准则等模型，利用有限差分软件，结合剪应力分析和塑性区分析，针对不同地应力环境下溶洞的剪应力变化情况和破坏特点进行分析和总结发现，溶洞的稳定性与其所处的地应力环境存在很大关系。将地应力分解为静水应力和剪切应力，回归分析绘制趋势图发现静水应力和剪切应力之间的比值与溶洞可以承载的极限路基高度近似为负相关的线性关系。对沿线岩溶塌陷位置以及实测的路基填筑高度进行统计，并与预测成果对比发现地应力对溶洞稳定性的影响不可忽略。

Abstract

In order to analyze the influence of geostress on the stability of karst cave

a geostress model was developed based on the geostress database in China and the geostress formula in the research region. In-situ measurement was executed to bridge the gap between the geostress model and the engineering application. For the convince of evaluating the magnitude of shear stress and plastic zone

the karst cave was modeled through the finite difference software with applications of the geostress model and Hoek-Brown yield criterion. Special attention is paid to the stability evaluation of the karst cave under various geostress conditions during modelling. Several beneficial consequences obtained from the evaluation suggest that the role of the geostress condition is quite important in influencing the stability of karst cave. The geostress is decomposed into the mean stress and the shear stress for the sake of exploring its explicit influcement. An empirical equation was summarized via regression analysis to explicitly depict the approximately linear relationship between the ratio between the mean stress and the shear stress and the capability of karst cave. An in-situ investigation considering the collapse site and the ultimate subgrade height was conducted to compare with the numerical results. The results suggest that a reasonable consideration of geostress is necessary for evaluating the stability of karst cave.

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