采空区高速公路路基的稳定性评价及治理方案探讨

采空区是高速公路建设中一种特殊的不良地质作用，北京房山地区由于开采建筑石材而形成诸多采空区。由于无规划、无序、反复地开挖，采空区的分布、边界条件复杂，致使这类采空区路基的稳定性评价和治理难度大。本文以京石二通道（大苑村-市界）高速公路路基下伏的某采空区为实例，采用开采条件判别法、极限平衡分析、塌落自行填塞法、普氏拱分析方法，对路基下伏采空区的稳定性进行综合评价以及针对不稳定采空区路基的相关治理措施进行了初步探讨。

DISCUSSION ON THE STABILITY EVALUATION AND TREATMENT MEASURES FOR SUBGRADE OF HIGHWAY IN THE MINED-OUT AREA

There is lots of mined-out area in Beijing Fangshan region due to mining building stone, which is a kind of adverse geologic actions in highway construction. Stability evaluation and treatment on subgrade of highway in mined-out area is quite difficult because of no planning, disorderly, and repeatedly excavation, the distribution and complicated boundary conditions of mined-out area. This article used the criterion mining conditions method, limit equilibrium analysis method, collapse self-obliteration method and the protodyakonov's theory to discuss the stability evaluation and treatment measures for a mined-out area of Jingshi second highway(Da yuan village～Beijing municipal boundary).