【作者】 张杨；

【导师】 张东升；

【作者基本信息】 中国矿业大学 ， 采矿工程， 2014， 硕士

【摘要】 本论文基于山西王家岭煤矿20105工作面具体地质条件，综合采用理论分析、数值模拟、相似模拟试验及现场实测等研究方法，重点研究了2#煤层开采时的顶板来压规律及开采后“三带”分布特征，并取得了如下研究成果：（1）结合顶板破断的力学模型和“三带”计算的经验公式，得出基本顶初次垮落步距为54.3m，周期垮落步距为28.5m，垮落带和裂隙带“两带”的发育高度范围111.6~173.6m。（2）采用UDEC数值模拟软件，对20105工作面覆岩活动规律进行了数值模拟分析。结果表明，工作面推进50m时基本顶初次破断，基本顶周期垮落步距为25~30m，垮落带和裂隙带“两带”最终发育高度约为134~146m，为采厚的21.6~23.5倍，其中垮落带高度为17~20m，裂隙带高度为114~129m，切眼处岩层破断角为63°，工作面停采处岩层破断角约为66°。（3）实验室相似材料模拟结果表明，基本顶初次垮落步距为50.4m；基本顶周期垮落步距在23~34m，平均28.5m；垮落带高度在16.4~19.5m，裂隙带高度最大达到115.6m；切眼处岩层破断角为64.5°，工作面停采处岩层破断角约为66°。（4）采用顶板在线监测系统对20105工作面顶板来压规律进行了监测，通过钻孔窥视法对覆岩“三带”的发育高度进行了实测，结果表明：垮落带高度在18~20m，裂隙带发育高度约为121.4m，20105工作面初次来压步距为54.5m，周期来压步距分布在28.2~34.6m。实测结果验证了理论计算、数值模拟分析及相似模拟试验结果的准确性和可靠性，为矿井后续安全高效开采提供了相应的理论支撑。更多还原

【Abstract】 Based on the specific geological conditions of20105working face, aiming at theproblems in the process of the Wangjialing coal mine, theoretical analysis, numericalsimulation and similar simulation test and field measurement are carried out for theroof weighting law of2#coal seam and distribution of "three zones" after mining,and obtained the following results:（1）Combined with the mechanical model of roof breaking and the experienceformula of the "three zones". The results show that the first weighting interval of mainroof is54.3m,and its periodic weighting interval is28.5m. The height of “twozones” is about111.6~173.6m.（2）Numerical simulation software, UDEC, is used to simulate the overlyingstrata movement during the mining process of20105face.The results show that thefirst weighting interval of main roof is50m,and its periodic weighting interval is25to30m. The height of destroyed cover rock is about134to146m, which is21.6to23.5times of the mining thickness, thereinto,the caving zone height is about17to20m, and fractured zone height is114to129m.The strata fracture angle in the open-offcut is63°,and it is about66°on the stop line of working face.（3）The results of simulation test show that first weighting interval of mainroof is50.4m; and its periodic weighting interval is23~34m and28.5m onaverage; the caving zone height is about16.4to19.5m, and the maximum height offractured zone is115.6m.The strata fracture angle on the open-off cut is63°,and it isabout66°on the stop line of working face.（4）Through the online monitoring system on the roof and sight instrument, roofpressure behavior of20105face and growth altitude of "three zones" are measuredand analyzed. The results of in-situ measurement coincides with those of thetheoretical calculation, numerical simulation analysis and simulation test, providingcertain theoretical support for high-yield and high-efficient mining.更多还原