Large-scale experimental study of multi-layered reinforcement to prevent underneath sinkhole in karst terrain and the design method
HE Wei1，2，LI Kun1，WANG Fanghong1
(1. School of Civil Engineering and Architecture，Changsha University of Science and Technology，Changsha，Hunan 410114，China；
2. Co-Innovation Center for Advanced Construction and Maintenance Technology of Modem Transpotation Infrastructural Facility，Changsha University of Science and Technology，Changsha，Hunan 410114，China)
Abstract：To prevent the underneath collapse induced hazard in road transportation，the multi-layer geotextile reinforcement is a cost-effective and promising technology，although its bearing mechanism and design method remain to be further studied. The embankment models of 1∶5 in scaling，with the single-layer，three-layer and four-layer geotextile reinforcements installed respectively，were designed and tested in laboratory. In order to study the load distribution and displacement characteristics，the vertical pressure on each geotextile and the relevant displacement were measured with the load cells and deformeters installed in the model. The key issues in design and the relevant calculation theory were discussed based on the measured data. The test results revealed that，in multi-layered geotextile reinforcement，the foot of soil arch might rise to around the top-layer reinforcement，and the dual-soil-arch emerged. The upper load distributed non-uniformly among the reinforcements. The surface depression could be related to the bottom deflection with a simplified method ignoring the dilation effect. The bottom-layer reinforcement is the key to control the surface depression while the top-layer is of the most importance to control the limit state. Based on the measured data and further analysis，a flow chart of design was proposed for practical engineering application.
贺 炜1，2，李 昆1，王芳洪1. 防岩溶塌陷加筋垫层大比例模型试验及设计理论研究[J]. 岩石力学与工程学报, 2016, 35(5): 980-988.
HE Wei1，2，LI Kun1，WANG Fanghong1. Large-scale experimental study of multi-layered reinforcement to prevent underneath sinkhole in karst terrain and the design method. , 2016, 35(5): 980-988.
贺 炜，付宏渊，殷苗苗. 岩溶区路堤下水平加筋体受力分析方法研究[J]. 水文地质工程地质，2010，(6)：33-37.(HE Wei，FU Hongyuan，YIN Miaomiao. Study on calculating method of horizontally reinforcement beneath embankment constructed in karst terrain[J]. Hydrogeology and Engineering Geology，2010，(6)：33-37.(in Chinese))
2016, Vol. 35 
