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| Study on tensile mechanical properties and energy consumption law of saturated slate under impact loads |
| LIU Yunsi1，2，HE Chushao1，2，FU Helin3，WANG Shiming2，LEI Yong1，2，PENG Yaxiong1，2 |
| (1. Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；2. School of Civil Engineering，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；3. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China) |
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Abstract In order to study the dynamic tensile mechanical properties and energy dissipation mechanisms of layered slate under saturated conditions，Brazilian disc split test was performed by using SHPB system with a 50mm diameter rod，and the influence of water，bedding angle and loading rate on the dynamic tensile strength，failure mode and energy dissipation of slate was studied. The research results show that the dynamic tensile strength and the dissipated energy density of slate increase with increasing the loading rate. When the loading rate is lower than 395 GPa·s－1，the tensile strength of saturated slate is lower than that of dry slate，and the strength of the rock mass is softening. However，when the loading rate is higher than 395 GPa·s－1，the tensile strength of saturated slate is higher than that of dry slate，and the strength of the rock mass presents a strengthening phenomenon. Saturated slate shows tensile failure mode and combined tensile and shear failure mode when the loading angle q is in the ranges of 0°–15°and 30°–90°. When q = 75° and 90°，the dynamic tensile strength of saturated slate increases faster as the loading rate increases，and at the same time，the energy dissipation and the dissipation rate are the highest. The dissipated energy density of saturated water slate is higher than that of dry slate under impact loads.
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2020, Vol. 39 
