摘要
近距离煤层群开采覆岩破坏特征不同于单层煤开采,同时存在层间相互影响的问题。以晋能控股煤业集团燕子山煤矿11#煤层、14-2#煤层、14-3#煤层三层近距离煤层为研究对象,通过进行物理相似模拟实验和数值模拟计算,研究分析了近距离煤层群开采时顶底板围岩的覆岩破坏特征及应力传递规律。研究结果表明:近距离煤层群下行开采过程中,随着采动次数增加,顶板横向裂隙超前发育和纵向裂隙穿层效果更为明显,垮落块度明显减小,来压规律不明显;煤层顶板覆岩因采动产生的应力峰值随采动次数增加而降低;初次采动影响下,稳定后的覆岩应力要明显小于原岩应力,而多次采动稳定后的覆岩应力与该次采动前相近;上覆岩层在多重采动影响下,破坏更彻底,形成台阶式的岩层切落。研究结果可为条件相似的近距离煤层群开采顶底板围岩控制、采空区积水及瓦斯防治提供参考依据。
The failure characteristics of overburden in contiguous coal seams mining are different from those in single seam mining,and there are problems of interlayer influence.Taking the 11#,14-2#and 14-3#coal seam in Yanzishan Coal Mine of Jinneng Holding Coal Industry Group as the research object,through the physical similarity simulation experiment and numerical simulation calculation,the overburden failure characteristics and stress transfer rule of the surrounding rock of the roof and floor during the contiguous coal seams mining were studied and analyzed.The research results show that with the increase of mining frequency,the lateral crack development and vertical crack penetration effect of the roof are more obvious,the caving block degree decreases obviously,and the pressure law is not obvious.The mining-induced stress peak value of coal seam roof overburden decreases with the increase of mining frequency.Under the influence of the first mining,the overburden stress after the stabilization is obviously smaller than that of the virgin rock,while the overburden stress after repeated mining stabilization is similar to that before the mining.Under the influence of multiple mining movements,the overlying strata are destroyed more thoroughly,forming a stepped cut.The research results can provide reference for the control of surrounding rock,water accumulation and gas control in goaf in contiguous coal seams with similar conditions.
作者
杨曜驰
赵国贞
YANG Yaochi;ZHAO Guozhen(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Property-improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭工程》
北大核心
2024年第3期110-116,共7页
Coal Engineering
基金
国家自然科学基金项目(U22A20167)
山西省基础研究计划项目(202303021221007)。
关键词
近距离煤层群
多重采动
覆岩破坏特征
应力传递规律
contiguous coal seams
multiple mining
overburden failure characteristics
stress transfer law
