摘要
以新巨龙矿井2301采场为工程背景，通过数值模拟研究了深厚表土薄基岩采场合理支护阻力，结果表明：深厚表土薄基岩采场支架载荷具有显著的时间效应，支架载荷来自顶煤、直接顶自重、基本项破断产生的冲击载荷和厚表土层缓慢变形产生的附加载荷，建立了此类采场支护阻力的计算模型；综合考虑支架载荷显著的时间效应和试验采场多种岩层结构模型，确定试验采场合理支护阻力为13700kN；微震监测结果表明试验区域基岩层厚度为50m，直接顶厚度为30m，基本顶厚度为20m；支架载荷监测结果表明采场支架的工作阻力基本处于10000～14000kN，从而验证了所选支架的适应性，对深厚表土薄基岩综放采场支架选型具有参考意义．
Taking the LW 2031N of Xinjulong mine as an example, the reasonable support re- sistance of fully-mechanized sublevel caving face with deep alluvium thin bedrock was investiga- ted by the numerical simulation. The results show that the support load had a significant time effect and came from the weight of top coal and immediate roof, the impact load induced by basic roof destruction and the additional load induced by the slow deformation of deep alluvi- um. The model for determination of the reasonable support resistance was proposed. Consider- ing the remarkable time effect of support load and the variety of rock structure model, the rea- sonable support resistance of the test face is 13 700 kN. Microseismic monitoring reveals the thickness of bedrock in test face is 50 m, immediate roof thickness is 30 m, and basic roof thickness is 20 m. The support load monitoring shows that the support resistance is 10 000-- 14 000 kN basically, which verified the support resistance. The results above can provide a ref- erence for support selection of fully-mechanized sublevel caving face with deep alluvium thin bedrock.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2015年第3期460-465,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51274022,51174016)
国家青年科学基金项目(51204010)
关键词
深厚表土
薄基岩
综放采场
支护阻力
时间效应
deep alluvium
thin bedrock
fully-mechanized sublevel caving face
resistance
time effect
