TSL材料防护作用下砂岩动态抗拉性能的试验研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (21) : 192-199.

论文

王世鸣1，熊咸瑞1，王嘉琪1，颜世军1，吴秋红2，翁磊3

作者信息 +

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

Author information +

文章历史 +

摘要

TSL（Thin Spray-On Liner）材料作为一种新型的支护材料，已经开始运用于矿山巷道等工程支护。TSL材料在支护过程中不可避免受到爆破开挖等动载荷的扰动。因此，本文对TSL作用下砂岩的静态和动态抗拉性能展开试验研究，试验考虑了TSL与砂岩的三种接触面(光滑型和两种粗糙型接触面），每一接触面设置了三组TSL的支护厚度(1mm,3mm和5mm)，其中动载试验采用超高速数字图像相关(DIC)试验系统记录动态拉伸破坏过程和试样表面应变场变化过程。研究表明，静载和动载下，TSL材料对砂岩的抗拉强度和抗拉变形均有明显的提高作用。在静载下，随着TSL厚度和接触面粗糙度的增加，砂岩抗拉强度明显提升，次生裂纹减少，当TSL厚度超过3mm后，随着厚度的增加，抗拉强度增加速率降低；在动载下，当接触面为光滑型时，只有当施加TSL的厚度达到5mm，试样的抗拉强度和变形能力才有较好的提升，而当接触面为粗糙型时，支护效果受接触面粗糙度、TSL厚度和加载率三者共同影响，TSL能延缓砂岩起裂时间，当加载率超过一定值后，粗糙度和TSL厚度的增加对支护效果提升作用有所下降。

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.

导出引用

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[J]. Journal of Vibration and Shock, 2023, 42(21): 192-199

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