摘要:
在采动影响下，大倾角复合顶板工作面中上部覆岩破坏严重，造成支架未接顶，严重影响安全生产。针对该问题，以新集二矿211112大倾角复合顶板工作面为工程背景，采用数值模拟和现场监测的综合研究方法，对采动影响下211112大倾角复合顶板工作面矿压显现规律及顶板控制技术进行了研究。研究表明：大倾角复合顶板比非复合顶板条件下的工作面最大覆岩卸压拱高度、宽度以及拱顶距上端头距离分别高出5、13、3 m；煤层开采后垂直应力在倾斜方向呈非对称性，工作面下端头前方支承压力最大值比上端头前方支承压力最大达32%；复合顶板比非复合顶板工作面覆岩最大垂直位移高10%，卸压快且工作面中上部的破坏程度更严重。现场监测表明工作面中上部受力较大，先来压，导致工作面中上部下沉位移量大，卸压程度高，与模拟结果相吻合，解释了211112工作面72～95号支架（工作面中上部）范围出现漏顶，支架未接顶现象。据此，提出采用无机注浆加固材料对破碎复合顶板进行充填的控制技术，现场试用效果良好，实现了大倾角复合顶板工作面安全高效开采。
Abstract:
Under the influence of mining, the overburden in the middle and upper part of the large dip compound roof working face is seriously damaged, causing the support not to be connected with the roof, which seriously affects the safety production. Aiming at this problem, this paper takes the 211112 large dip angle compound roof working face of Xinji No.2 Mine as the engineering background, and adopts the comprehensive research method of numerical simulation and field monitoring to study the mine pressure behavior law and roof control technology of 211112 large dip angle compound roof working face under the influence of mining. The results show that the height and width of the maximum overburden relief arch and the distance from the arch crown to the upper end of the working face under the condition of large dip compound roof are 5, 13 and 3 m higher than those under the condition of non-composite roof. After coal mining, the vertical stress of coal seam is asymmetrical in the inclined direction, and the maximum abutment pressure in front of the lower end of working face is about 32% higher than that in front of the upper end. The maximum vertical displacement subsidence of overburden of compoud roof is about 10% higher than that of non-compound roof working face. The pressure relief is faster and the damage degree of the middle and upper part of working face is more serious. The field monitoring shows that the force on the middle and upper part of the working face is larger, and the pressure comes first, which results in large subsidence displacement and high pressure relief degree of the middle and upper part of the working face, which is consistent with the simulation results. It explained that the scope of No.72—No.95 supports (middle and upper parts of the working face) in 211112 working face had roof leakage, and the supports were not connected to the roof. On this basis, the control technology of filling broken composite roof with inorganic grouting reinforcement material is proposed. The field trial results are good, and the safe and efficient mining of the large dip Angle composite roof working face is realized.
百度学术
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