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| Experimental study on dynamic compression characteristics of rock with filled joints after cumulative damage |
| CHAI Shaobo1，2，WANG Hao1，JING Yanlin1，JIA Neng1 |
| (1. School of Civil Engineering，Chang¢an University，Xi¢an，Shaanxi 710064，China；2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China) |
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Abstract The dynamic mechanical behaviour of filled rock joints and its influence on stress wave propagation are important bases for dynamic response analysis and safety evaluation of rock mass engineering. In view of the lack of research on the cumulative damage and the strength weakening of filled joints by dynamic loading disturbance，series of tests are carried out on the artificial filled jointed rock samples to study the damage evolution rule under the cumulative impacts and its influences on the dynamic mechanical properties in this present paper. A simply equipped drop hammer impact device is used to carry out multiple pre-impact tests on the jointed rock samples，then the cumulative damage law is analyzed through the change of the wave velocity. On this basis，the dynamic impact tests of SHPB are carried out on filled jointed rock samples after different numbers of pre-impact. Based on the test results，the influence of cumulative damage on the dynamic mechanical properties of the filled jointed rock is analyzed from the aspects of strength deformation characteristics，wave propagation characteristics and energy dissipation.
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2020, Vol. 39 
