基于钻孔CT溢洪道底部溶洞稳定性影响参数敏感性分析

溶洞分布具随机性,为研究岸边式溢洪道底部溶洞的稳定性及溶洞的应力、位移的敏感性,首先用钻孔CT对溢洪道底部分布的溶洞进行探测,根据探测结果,利用有限元ANSYS软件建立模型,采用单一变量法分析了溶洞分布于溢洪道底板不同位置时溶洞自身的应力、位移敏感性。结果表明,溶洞的宽度大于闸室宽度情况下,溶洞位置越靠近溢洪道底板,溶洞应力、位移最大值逐渐增大,溶洞顶板距溢洪道底板的距离小于等于溢洪道底板宽度的18.42%情况时,属敏感距离,溶洞宽度大于等于溢洪道底板宽度的80.0%情况时,属敏感宽度。

Sensitivity Analysis of Parameters Affecting Stability of Karst Cave at the Bottom of Spillway Based on Drilling CT

The distribution of Karst caves is random.In order to study the stability of the Karst caves at the bottom of the bank spillway and the sensitivity of the Karst caves’ stress and displacement,the Karst caves distributed at the bottom of the spillway are detected by borehole CT.A model is established with ANASYS,and the single variable method is used to analyze the stress and displacement sensitivity of the caves when the caves are distributed at different positions on the floor of the spillway.The results show that when the width of the cave is greater than the width of the gate chamber,the closer the cave is to the bottom of the spillway,the maximum stress and displacement of the cave gradually increase.When the distance between the top of the cave and the bottom of the spillway is less than or equal to 18.42%of the width of the bottom of the spillway,it is sensitive distance.When the width of the cave is greater than or equal to 80.0%of the width of the spillway floor,it is sensitive width.