GRAVEL-SOIL SLOPE WITH LIME IMPROVED AND NUMERICAL ANALYSIS ON STABILITY OF GRAVEL-SOIL SLOPE WITH PILE-ANCHORS
WANG Xingang1，HU Bin1，LIAN Baoqin2，JIANG Haifei1，YU Hongming1
(1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；2. Department of Building Engineering，Guangzhou City Construction College，Guangzhou，Guangdong 510925，China)
Abstract：By compounding raw lime powder with gravel-soil taken from mining area in Bangpu of Tibet，the largedirect shear test for improved gravel-soils with lime-soil ratios of 3%，5%，7% and 9% was conducted to investigate the shear strength of gravel-soils with lime improved and the improvement effect. The tests show that：as the moisture content of the soil sample reduces，the bite friction and cohesive strength of samples increases，the shear strength of gravel-soil increase with lime addition；and the improvement effect with lime-soil ration of 9% is best. Finally，based on the indoor test results and theoretical formula，the gravel-soil slope protection with lime improves，anchor slope protection，anti-slide pile slope protection and with the above method combined slope protection in North-east Bangpu of Tibet are analyzed with FLAC3D numerical model. It shows that the maximum horizontal displacement of slope decrease significantly，and with no breakthrough of plastic zone，and the glide force reduce effectively after using the gravel-soil slope joint protection with lime addition，anchor reinforcement and anti-slide pile. The joint slope protection method can be more effective than above three separate method.
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2013, Vol. 32 
