In order to reveal the creep characteristics and long-term strength of rock and soil mass in waste dump,a series of tests were conducted using ZLB-1 type triple creep direct shear creep apparatus in a graded loading form to study the creep characteristics and long-term strength variation laws of rock and soil mass under different water contents and consolidation pressures.The test results show that within the range of 15％to 39.2％(saturated)water content,the rock and soil mass in the waste dump show nonlinear creep,and with the increase of shear stress,the creep curve showed attenuation creep,unstable creep,and accelerated creep,until the sample is damaged.A large instantaneous strain occurred immediately after the application of shear stress,and it increased with the increase of shear stress.The long-term strength index showed an exponential decreasing trend with water content;compared with the 15％water content sample,the long-term strength index of the rock and soil mass in the waste dump under saturated water content:cohesion decreased by 66％,internal friction angle decreased by 69％;its variation law meets the exponential fitting formula.The research results which can provide basic data for stability calculation of the same type of water-bearing waste dump.
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