下伏窑洞路基稳定性评价及处治技术研究

2010.Research on Stability Evaluation and Treatment Technology of Underlying Kiln Cave Roadbed

为研究三淅高速公路建设中遇到的下伏窑洞路基稳定性问题,文章通过现场取样和室内试验获得岩土材料参数,并通过数值模拟,采用强度折减法研究了下伏窑洞路基典型工况的破坏机理,确定窑洞路基处治判别的安全系数标准和安全距离标准。研究认为,路基正下方埋深小于3m的窑洞均应处治。当水平距离为0m和5m时,路基可不进行处治的临界窑洞埋深分别为5.4m和8.4m;当窑洞埋深为3m、5m、9m和12m时,路堤坡脚与陡崖的安全距离分别为7.2m、8.1m、9.9m和12.6m。研究同时给出下伏窑洞路基处治措施,以期为三淅高速公路和类似工程建设提供参考。

In order to study the stability of the underlying kiln cave roadbed encountered in the construction of Sanxi expressway,the failure mechanism of the typical working conditions of the underlying kiln cave roadbed is studied through the parameters of the rock and soil materials obtained from the on-site sampling and indoor experiments,and the numerical simulation with the strength reduction method.The safety factor standard and safety distance standard for the treatment and discrimination of the kiln cave roadbed are determined.The research suggests that,kiln caves buried below the roadbed with a depth of less than 3m should be treated.When the horizontal distance is 0m or 5m,the critical burial depth of the kiln cave that can be left untreated on the roadbed is 5.4m or 8.4m respectively;when the burial depth of the kiln cave is 3m,5m,9m,or 12m,the safe distance between the embankment slope foot and the steep cliff is 7.2m,8.1m,9.9m or 12.6m respectively.The treatment measures for the roadbed of the underlying kiln cave are given in the research,so as to provide reference for the construction of Sanxi expressway and similar projects.