摘要
以寺河二号井为试验矿井,采用相似模拟和数值模拟实验对下保护层开采后覆岩裂隙演化规律进行研究,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"。
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 resuhs show that：（ 1 ）After mining protecting strata, the caving zone height is 4.0 m and fractured zone height is 26.0 m; （2）In recovery process of coal seam,the overburden failure is e- voluted 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 are with high angle and middle width, the number of fissure gradu- ally decreases with away from coal seam ; （5） The distribution of fractured zone are high at both ends, low of the middle, such as saddle - shaped.
出处
《世界科技研究与发展》
CSCD
2016年第1期54-58,共5页
World Sci-Tech R&D
关键词
采矿工程
数值模拟
相似模拟
裂隙演化
下保护层
mining engineering
numerical simulation
similarity simulation
cracks evolution
underside protective seam
