TSL材料防护作用下砂岩动态抗拉性能的试验研究  

Test study on dynamic anti-tension performance of sandstone under protection of TSL material

作　　者：王世鸣[1] 熊咸瑞 王嘉琪 颜世军[1] 吴秋红[2] 翁磊 WANG Shiming;XIONG Xianrui;WANG Jiaqi;YAN Shijun;WU Qiuhong;WENG Lei(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;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;School of Civil Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭411201 [3]武汉大学土木建筑工程学院,武汉430072

出　　处：《振动与冲击》2023年第21期192-199,218,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51604109,52004328);湖南省教育厅项目(22B0507)。

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,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3种接触面(光滑型和两种粗糙型接触面),每一接触面设置了3组TSL的支护厚度(1mm,3 mm和5 mm),其中动载试验采用超高速数字图像相关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3 mm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5 mm,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。TSL(thin spray-on liner) material,as a new type of support material,is used in engineering support,such as,mine's roadways.TSL material is inevitably disturbed by dynamic loads of blasting and excavation in support process.Here,tests for static and dynamic anti-tension performance of sandstone were conducted under the action of TSL.In tests,3 types of contact surfaces including smooth and 2 types rough contact surfaces between TSL and sandstone were considered,and each contact surface was set with 3 sets of TSL support thicknesses of 1 mm,3 mm and 5 mm.An ultra high-speed digital image correlation testing system was used in dynamic load tests to record dynamic tensile failure process and change process of sample surface strain field.It was shown that under both static and dynamic loads,TSL material has obvious improvement effect on tensile strength and tensile deformation of sandstone;under static load,with increase in TSL thickness and contact surface roughness,tensile strength of sandstone obviously increases,and secondary cracks decrease;after TSL thickness exceeds 3 mm,increasing rate of tensile strength decreases with increase in thickness;under dynamic load,if contact surface is smooth type,only when TSL thickness reaches 5 mm,tensile strength and deformation ability of sample can better be improved;if contact surface is rough type,contact surface roughness,TSL thickness and loading rate simultaneously affect the support effect;TSL can delay crack initiation time of sandstone,when loading rate exceeds a certain value,increase in roughness and TSL thickness has a decreasing effect on improving the support effect.

关 键 词：TSL 砂岩 动载 巴西劈裂 数字图像相关 

分 类 号：TU45[建筑科学—岩土工程]