岩溶区空间变异性边坡建筑荷载作用下稳定分析∗
Stability Analysis of Slope with Spatial Variability in Karst Area under Building Load
- 防灾减灾工程学报 2023年43卷第2期 页码：316-323
- 作者机构：
重庆大学土木工程学院,重庆,400045
- 作者简介：
- 基金信息：国家自然科学基金面上项目(52078086)、重庆市自然科学基金(cstc2020jcyj-jq0087)、重庆市自然科学基金(cstc2020jcyj-cxttX0003)资助
DOI：
中图分类号： TU457-
纸质出版：2023
- 稿件说明：
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仉文岗. 岩溶区空间变异性边坡建筑荷载作用下稳定分析∗[J]. 防灾减灾工程学报, 2023,43(2):316-323.
仉文岗,孟凡胜,何昌杰,黎泳钦,李建新.岩溶区空间变异性边坡建筑荷载作用下稳定分析∗[J].防灾减灾工程学报,2023,43(2):316-323
摘要
基于长沙湘江欢乐城废弃矿坑进行改造再利用工程项目，为保证上部工程建筑安全，对地质条件复杂且常有岩溶发育的矿坑高陡边坡稳定性开展了系列研究。考虑岩土体固有的空间变异性及岩溶孔洞影响，采用确定性和可靠度分析相结合的方法对边坡稳定性进行评价。首先针对土岩结构多级高边坡采用 Morgenstern?Price 法计算非圆弧滑动面条件下的安全系数；随后基于随机场理论，考虑岩土体抗剪强度指标的空间变异性，对不同变异特征下受结构荷载作用的高陡分级边坡稳定性开展了概率分析；并探讨了岩溶空洞的发育情况及位置对高陡边坡可靠度的影响。结果表明，在土?岩二元结构的边坡中，滑动破坏往往只发生在性质较差的上层土体中。考虑岩土体力学特性的空间变异特征对边坡稳定性分析具有重要意义，忽略空间变异性可能高估边坡的失效概率；溶洞位置和形状都会影响边坡稳定性，溶洞越靠近陡峭临空面对边坡影响越大，整体来说圆形溶洞比方形溶洞更容易造成边坡失稳破坏。
Abstract
To ensure the safety of the superstructure rising from the slope rock wall， extensive studies on the stability of a high and steep slope in a karst area with complex geological conditions were carried out， with reference to the Changsha Xiangjiang happy city rose from a deep abandoned mining pit. In this study， considering the inherent spatial variability of rock and soil and the influence of karst caverns， slope stability is evaluated through both deterministic and reliability analysis. Firstly， the safety factor of the multi-step high slope with a non-circular sliding surface is calculated using the Morgenstern-Price method. Then the probability analysis of the high steep stepped slope subjected to structural load is carried out considering spatial variability of the shear strength indices based on the random field theory. Additionally， the effect of the karst carven condition on the reliability of the high and steep slope is discussed. The results indicate that in the soil-rock dual structural slope without the effect of the karst cavern， the sliding failure generally develops only in the upper soil mass with poor mechanical properties. And the spatial variability has a significant impact on the failure probability of slopes， ignoring the variation leads to an overestimation of the failure probability. As for the karst caverns， the location and shape of the cave both significantly affect the slope stability. The closer the cave is to the steep free face， the greater the influence of the slope is. Generally speaking， circular caverns are more likely to cause slope instability and damage than square caverns.
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references
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