岩溶地下洞河诱发路基空间失稳机理数值模拟

Analysis on Mechanism of Roadbed and Subgrade Space Instability Caused by Underground Cavity and River in Karst Area

随着“西部大开发”等国家战略的实施以及这些地区城市建设的发展，许多公路、铁路等交通都需要源于或穿越这些岩溶洞穴地区，随即面临因岩溶洞穴的塌陷所导致的路基失稳与破坏问题。本文依托昌金高速某段的岩溶塌陷进行了数值模拟，并结合塌陷段模拟分析所得的岩土体参数对邻近未塌陷段的二个处治方案进行了处治工程效果的数值模拟分析，为方案比选提供依据，对岩溶洞穴地区道路建设具有一定的指导与借鉴意义。

With the ＂development of the western regions＂ implementation and the development of urban construction in goaf- karst cavity areas, the highways will come from or pass through these areas,there will be many problems of instable subgrade caused by goaf-karst cavity collapse. This paper studied the subgrade stability of two projects in goaf- karst cavity areas. The analysis of subgrade stability caused by karst cavity was relied on a collapse accident happened in Changjin expressway. The suitable parameters of rock and soil are obtained through the numerical simulation of collapsed subgrade, the treatment project for the subgrade near collapse is evaluated by using the parameter obtained in frontal calculation, and a better project is chosen through the result of numerical simulation, which is important for construction of a highway in goaf- karst cavity area.