弓长岭井下矿上盘运输巷道让压开拓方法研究

弓长岭井下矿中央区-280 m上盘运输巷道地压活动剧烈，高强度的刚性支护无法控制地压显现，支护后巷道出现拱顶开裂下沉、墙体片帮内推、底鼓等现象，严重地影响了矿山正常生产。现场调查了-280 m上盘运输巷道的破坏部位和破坏范围，分析了岩性对巷道稳定性的影响，研究得出楔形体压力是地压显现的直接原因，建立了力学模型，并通过计算验证分析的可靠性。利用上盘回采边界与巷道破坏边界的相互关系，确定让压角为74°～78°，划分塑性变形区和弹性变形区，将-340 m上盘运输巷道布置在弹性变形区，采取让压开拓方式。实践表明，让压开拓方案能够有效地控制上盘运输巷道地压显现问题，保证矿山的正常生产。

The Yielding Development in Hanging Haulage Roadway in Gongchangling Underground Mine

There are strenuous ground pressure activities at the -280 m level in the central mining area of Gongchangling Mine，so that the high-strength support can not solve the problems that are caused by the ground pressure.The destructions of roof falling，rib spalling and floor heave still occur even after the roadways have been supported，which have seriously affected the normal production of the mine.It is indicated that the ground pressure activity is basically caused by the pressure of the above wedge-shape rock mass based on the investigation of the failure positions of the haulage roadway，the test results of the rock mechanics properties and the analysis of the effect of the hanging wall to the stability of the roadways.The mechanic model is established and the analysis results have been proven based on the calculation of the model.The yielding angle is determined to be from 74°to 78° by analyzing the relationship between the mining boundary in the hanging wall and the destruction boundary of the roadways.Based on the yielding angle，the rock mass can be divided into the elastic zone and the plastic zone.The hanging haulage roadway at the -340 m level is located in the elastic zone，so the yielding development is adopted in this area.The practice shows that the yielding development can effectively alleviate the problems that are caused by the ground pressure in the hanging haulage roadway and ensure the normal production of the mine.