多点位移计在岩溶桥基监测中的应用

Application of Multi-point Extensometers to the Monitoring of Bridge Foundation in Karst Area

公路设计时不可避免地要通过许多地质条件较差的岩溶地区,岩溶的存在对公路运行的安全造成很大的隐患,怎样评价和预测施工及运行过程中溶洞顶板稳定性是工程建设中急待解决的问题。原位测试是评价岩溶洞穴稳定性行之有效的方法。作为原位测试工具的一种,多点位移计能够精确地量测岩土材料的变形情况,并反映到数据采集系统。本文简单介绍了WRM-3型多点位移计的原理及组成,并详细介绍了其在岩溶桥基监测中的应用,说明多点位移计应用于岩土体的监测是准确、可行的。

It is inevitable to encounter the bad geological environment such as karst area in the design of highway, which is a great hidden danger when the highway is in operation. How to appraise and forecast the stability of the karst roof is the problem which needs to be solved in engineering construction. The field testing is an effective method used for the appraising and forecasting. As the one of the field testing methods, the multi-point extensometers could be used accurately in the deformation monitoring of the rock and soil, and reflected to the data collecting system. The principle of the inclinometer （type WRM-3）, the composition and its application are introduced for the monitoring of the bridge foundation in karst area. The results indicate that the multi-point extensometers are very accurate in the monitoring for the settlement of bridge foundation in karst area.