Test study on dynamic anti-tension performance of sandstone under protection of TSL material
WANG Shiming1, XIONG Xianrui1, WANG Jiaqi1, YAN Shijun1, WU Qiuhong2, WENG Lei3
1.School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China; 2.Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China;
3.School of Civil Engineering, Wuhan University, Wuhan 430072, China
Abstract：While TSL (Thin Spray-On Liner) material has been used in engineering support such as mine roadways, the TSL is still inevitably disturbed by the dynamic loads (e.g., blasting loading) during excavation. It is for this reason that the study was proposed to reveal the static and dynamic tensile properties of the sandstone with the TSL. In this study, the effect of the contact surfaces on the smooth and rough contact surfaces between the TSL and the sandstone was examined. Also, the impact of the TSL thicknesses at 1 mm, 3 mm and 5 mm was investigated. An ultra-high-speed digital image correlation (DIC) was used to record dynamic tensile failure process. The results show that the TSL improved the tensile strength and the tensile deformation of the sandstone under the static and dynamic loads significantly. Under a static load, the tensile strength of the sandstone increased significantly with the increase of the TSL thickness and contact surface roughness, and the secondary cracks decreased. When the TSL thickness exceeded 3 mm, the increase rate of the tensile strength decreased with the increase of the thickness. Under a dynamic load, the tensile strength and deformation capacity of the specimen were both improved on the smooth contact surface only at a thickness of TSL of 5 mm. When the contact surface was rough, the parameters affecting the supporting effect included contact surface roughness, TSL thickness and loading rate. The TSL was able to delay the initiation time of sandstone cracking. When the loading rate was too large, further increasing the roughness and TSL thickness did not improve the support effect significantly.
王世鸣1，熊咸瑞1，王嘉琪1，颜世军1，吴秋红2，翁磊3. TSL材料防护作用下砂岩动态抗拉性能的试验研究[J]. 振动与冲击, 2023, 42(21): 192-199.
WANG Shiming1, XIONG Xianrui1, WANG Jiaqi1, YAN Shijun1, WU Qiuhong2, WENG Lei3. Test study on dynamic anti-tension performance of sandstone under protection of TSL material. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(21): 192-199.
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