单体水压支柱主动护顶技术在白牛厂矿的应用

Active roof support technology of individual hydraulic props in Bainiuchang mine

对门山矿深部矿体属典型的缓倾斜薄层状难采矿体。用全面法开采,地压管理困难,作业安全不能保证;用房柱法开采,留存矿柱损失大。引进单体水压支柱护顶技术能够很好地解决上述问题。设计水压支柱护顶全面采矿法,其中采场尺寸为40 m×8 m×4 m;基于塌落拱理论推导工作面支护强度计算公式,可得支护强度26.42 kPa,进而确定了支护密度为0.275根/m2;应用FLAC3D软件计算比选,最终确定最佳支护网度为3 m×1.2 m;通过工业试验,监测和分析支柱初撑力、工作阻力、活柱下缩量、顶板沉降量等数据,证明单体水压支柱护顶技术很好地控制了采场地压,并通过回归分析确定了该采场水压支柱合理初撑力和工作阻力分别为128.36,150.18 kN。

It is a typical gently inclined, thin and troublesome ore-body in the deep level of Bainiu-chang Mine. When using the overall mining method, it is difficult to manage the ground pressure and the operation safety can’t be ensured. Meanwhile, the loss of pillar left is huge when the room-pillar mining method is used. The roof supporting technology by using individual hydraulic props can be a good technology to solve the above problems. In this paper, the stope with its dimension of 40 m×8 m ×4 m was studied by overall mining method and roof supporting technology of hydraulic props. Using slumping arch theory the support intensity and support density were calculated, which are 26.42 kPa and 0.275 root/m 2, respectively. Meanwhile, the optimal proper space between hydraulic props is determined as 3 m×1.2 m by the calculation of FLAC3D . During the industrial test, by monitoring and analyzing the data such prop as setting load, sustaining resistance, descending amount of piston, and roof settle-ment, the roof supporting technology of hydraulic props can well control ground pressure of stope. Moreover, by regression analysis, the proper setting load and sustaining resistance of hydraulic props are 128.36 kN and 150.18 kN.