土工格栅在岩溶区路基上的应用研究

Applied research of geosynthetic reinforced embankment in karst areas

岩溶溶洞灾害是交通建设主要工程地质问题之一,采用土工格栅加筋处治方法能够有效降低岩溶坍塌风险。文章采用PLAXIS2D有限元软件,将溶洞上方加筋体划分为临空段、过渡段及锚固段3个受力特征段,研究岩溶区加筋路堤的位移、应力分布规律。结果表明,在溶洞坍塌后,临空段上方路基荷载通过土拱效应传递到锚固段,能够有效防止岩溶突然坍塌的风险。

Disaster caused by the cave is one of the primary matter for the road project at Karst area. It is often necessary to implement geosynthetics to reduce risk of sinkhole for roadbed engineering in karst areas. The reinforcement is considered composing of three portions which are portion above Karst cave,changeover portion and anchored portion adjacent to Karst cave. In this paper,the displacements and stresses in both embankment and geosynthetics were analyzed in detail based on the numerical simulation results by PLAXIS2 D. Results indicate that embankment load through the soil arching effect is passed to the anchored portion adjacent to Karst cave,and geosynthetics could be used for reinforcing embankment subjected to the influence of potential localized karst collapse.