摘要
针对在厚硬火成岩顶板下的采煤工程实例,理论分析了离层空间形成的机理与条件,并对研究区首采面"空腔型"离层空间位置进行判别;采用数值方法和光纤监测技术对厚硬火成岩下离层空间的演化与覆岩变形特征进行了过程模拟和动态监测分析。研究表明:首采面顶板覆岩共发育5处"空腔型"离层;上覆硬岩运移过程可分为下部支撑、底部离层扩展、失稳运移、离层闭合4个阶段;光纤监测结果在离层位置拉应力值逐渐增大,当离层上覆岩层受自重应力而失稳时,离层由下位岩层逐渐向上位岩层发展,直至发育到上位火成岩为止,这与数值模拟、理论判别结果相一致。
For the project case of mining under thick hard igneous roof, through theoretical analysis of the formation mechanism and conditions of separated stratum space, we discriminate ＂cavity type＂separation location of the first face in study area. The process simulation and dynamic monitoring analysis are adopted to simulate the characteristics of the evolution of separation stratum space and deformation of overburden strata through numerical method and optical fiber monitoring technology. Research shows that： a total of 5 roof rock at the first primary face can develop the ＂cavity type＂separation stratum space. The movement of overburden hard strata can also be divided into four steps which are named lower support, extension of the bottom separated stratum space, instability movment and closure of separated stratum space. The optical fiber monitoring value of tensile stress in separated stratum location increases gradually. The separation stratum develops gradually from the lower strata to upper strata until the upper igneous rock when the overburden strata of separation stratum loses stability by its self-weight stress. The results are consistent with the numerical simulation and theoretical discrimination.
出处
《煤矿安全》
CAS
北大核心
2017年第2期200-203,共4页
Safety in Coal Mines
基金
国家重点基础研究发展计划(973计划)资助项目(2015CB251601)
国家自然科学基金资助项目(41430643)
江苏高校优势学科建设工程资助项目
关键词
离层空间
空腔型
数值方法
光纤监测
厚硬火成岩
separation stratum space
cavity type
numerical method
fiber monitoring
thick hard igneous rock
作者简介
杨文丰（1993-），男，贵州遵义人，在读硕士研究生，主要从事水文地质与工程地质的研究。
