太原理工大学矿业工程学院;矿山岩层控制及灾害防控山西省重点实验室;山西浙大新材料与化工研究院;阳城县阳泰集团实业有限公司;
动载扰动作用是影响遗煤复采过程中围岩稳定性的重要因素,为研究不同预静载水平下动载扰动对砂岩抗剪强度、黏聚力、内摩擦角、应变场及声发射等参数的影响,采用动静载多场耦合试验系统、声发射监测系统和DIC应变监测系统对砂岩进行了动静组合加载变角剪切试验。研究结果表明:在组合加载下,随着预静载水平的增大,砂岩抗剪强度和黏聚力呈先增大后减小的趋势,内摩擦角和扰动前后最大主应变差值呈先减小后增大的趋势,均在75%τ预静载水平处达到极值;在组合加载下,声发射累计能量和累计振铃计数整体上可划分为第一稳定增长期、第一突增期、平静期、第二突增期、第二稳定增长期和第三突增期6个阶段,在扰动阶段声发射信号活跃程度随着预静载水平的增大呈先减小后增大的趋势,极值出现在60%τ预静载水平处。研究成果可为动静组合加载下围岩稳定性控制提供理论参考。
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基本信息:
DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.001
中图分类号:TD315
引用信息:
[1]龚昌建,冯国瑞,张玉江等.动静组合加载下砂岩剪切力学特性试验研究[J].采矿与岩层控制工程学报,2024,6(04):52-65.DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.001.
基金信息:
国家自然科学基金资助项目(51925402,52004172);; 山西省科技重大专项资助项目(20201102004)