地下空洞塌陷影响因子的灵敏度分析

地下空洞塌陷是引起路面变形破坏的主要原因。为了研究地下空洞塌陷影响因子的灵敏度，通过有限元软件ABAQUS建立数值模型，基于数值模拟的结果，采用灰色关联法计算各影响因子对地下空洞塌陷引起路面沉降位移的影响灵敏度，影响因子取土体内聚力、土体内摩擦角、土体弹性模量、地表荷载、地下空洞覆跨比、地下空洞跨径和地下空洞高度。得出各因子对地下空洞塌陷引起路面沉降位移的影响灵敏度依次为:地下空洞覆跨比>土体内摩擦角>地表荷载>土体内聚力>土体弹性模量>地下空洞高度>地下空洞跨径。

Sensitivity analysis of influence factors of underground cavity collapse

The collapse of underground cavities is the main cause of deformation and damage of pavement.In order to study the sensitivity of influence factors of subsidence of underground cavity，a numerical model was established by finite element software ABAQUS.Based on the results of numerical simulation，the sensitivity of each influence factor to the settlement displacement of pavement caused by subsidence of underground cavity was calculated by the grey correlation method.The influence factors are cohesion of soil，friction angle in soil，elastic modulus of soil，surface load，the ratio of cover to span of underground cavity，the span of underground cavity and the height of underground cavity.The results showed that the sensitivity of each factor to the settlement displacement of pavement caused by collapse of underground cavities is as follows:the ratio of cover to span of underground cavity>friction angle in soil>surface load>cohesion of soil>elastic modulus of soil>height of underground cavity>span of underground cavity.