论文部分内容阅读
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。
In order to study the effect of in-situ stress on the stability of karst caves, a geo-stress model was established based on the crustal stress and environmental database and the formula for calculating stress distribution in China. Based on the models of in-situ stress and Hoek-Brown yield criterion, the finite difference software is used to analyze and analyze the shear stress changes and failure characteristics of karst caves under different ground stress with the combination of shear stress analysis and plastic zone analysis. Sex and its stress in the environment there is a great relationship. The results show that the ratio of hydrostatic stress to shear stress is linearly negatively correlated with the ultimate subgrade height that the cave can carry. The location of karst collapse along the line and the measured filling height of subgrade are calculated. Compared with the prediction results, it is found that the influence of in-situ stress on cave stability can not be neglected.