MODEL TESTS OF RAINFALL INFILTRATION EFFECT ON BEDDING ROCK SLOPE WITH WEAK INTERLAYER
LI Longqi1，LUO Shuxue1，WEI Wenkai1，WANG Yunchao1，XU Hua1，XU Jun2
(1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；
2. The Second Railways Survey and Design Institute，Ministry of Railway，Chengdu，Sichuan 610031，China)
Abstract：In order to investigate the rainfall infiltration effects on working characteristics for the bedding rock slope with weak interlayer，model tests have been conducted combining superimposed spraying rainfall and fiber Bragg grating(FBG) monitoring technologies. Physical characteristics，including displacement and water content，have been studied aiming at bedding rock slope with different bedding angles and with and/or without supporting. The results show that，displacement of bedding rock slope with weak interlayer shows steep-variant and pull-type without supporting；while with supporting it shows slow-variant and push-type. At the same time，due to the interlayer dislocation phenomenon with the increasing of bedding angle， displacement monitoring in depth should be considered especially with the bedding angle larger than 35°. The weak interlayer mudding phenomenon is also observed in test and the location lay in the front of the without supporting bedding slope while it lies on the back of the supported bedding slope. With the continuing rainfall infiltration，the anti-slide force is changed from providing shear resistance of bolt to providing pull resistance of bolt. The test results can provide some advices to design and monitoring of similar slopes.
2013, Vol. 32 
