【作者】 王晓蕾； 秦启荣； 苏培东； 熊祖强；

【Author】 WANG Xiaolei;QIN Qirong;SU Peidong;XIONG Zuqiang;South West Petroleum University School of Geoscience and Technology;State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation // Southwest Petroleum University;School of Engineer Science and Engineering,Henan Polytechnic University;Collaborative Innovation Center of Coal Work Safety,Henan Province;

【机构】 西南石油大学地球科学与技术学院； 油气藏地质及开发工程国家重点实验室·西南石油大学； 河南理工大学能源科学与工程学院； 煤炭安全生产河南省协同创新中心；

【摘要】 下保护层开采后覆岩裂隙演化规律对于被保护层瓦斯抽采效果具有重要意义。以寺河二号井为试验矿井,采用相似模拟和数值模拟试验对下保护层开采后覆岩裂隙演化规律进行研究,研究结果表明:下保护层开采后覆岩冒落带发育高度为4m,裂隙带发育高度为26m;工作面回采过程中,覆岩破坏呈倒置的梯形演化,覆岩离层裂隙向前与向上同时渐进式演进;覆岩离层裂隙主要经历了形成、扩展、闭合三个过程,随着工作面的逐步推进中部采动裂隙被上覆岩层压实,而受煤柱支承作用,近煤壁区域裂隙数量仍然非常大;下保护层开采后上覆岩层采动裂隙以高角度、中宽度为主,裂隙数量随着覆岩高度的增加而逐渐减少;下保护层开采后裂隙带分布呈两边高中部低的"马鞍形"型。更多还原

【Abstract】 In recovery process of mining protecting strata,the overburden law of cracks evolution is of great significance to gas extraction of protected seam.Taking Sihe NO.2 mine as the experimental mine.Based on the similarity simulation and numerical simulation test,the overburden law of cracks evolution is studied.The results showed that:(1)After mining protecting strata,the caving zone height is 4.0m and fractured zone height is 26.0m;(2)In recovery process of coal seam,the overburden failure is evoluted by inverted trapezoidal,the overburden bed separated fissures are evoluted by forward and upward at the same time;(3)Process of the overburden bed separated fissures are formation,extendsion and closure,with the mining of working face,the mining induced fractures are compacted,due to coal wall supporting role,the quantity of crack of near the coal wall is very big;(4)After mining protecting strata,the fractures with high angle and middle width,the number of fissure gradually decreases with away from coal seam;(5)The distribution of fractured zone are high at both ends,lowof the middle,such as saddle-shaped.更多还原