Abstract

In order to solve the problems of coal pillar loss and relieve the tension of mining replacement in the coalface of a coal mine, this study proposes an adaptive method of retaining roadway along gob with supporting body (pier column) near loading roadway. The supporting technology of pier column retaining roadway along gob is studied through theoretical analysis and numerical simulation. The results show that the roof activity of roadway along gob can be divided into three distinct stages, namely, the stage influenced by primary mining, the stability stage of roadway retention, and the stage influenced by secondary mining. By establishing a roof mechanics model, equations are derived for calculating roof cutting resistance in three stages of gob retaining roadway, and the parameters of the supporting pier are determined. Combined with FLAC^3D numerical simulation, this study develops a numerical model to investigate the surrounding rock stress distribution characteristics and deformation rules, as well as the stress and deformation rules of piers and pillars during the two mining periods of gob retaining roadway. The numerical results demonstrate that the compressible pier column supporting body adopted in this study can not only achieve better retaining effect in the roadway along the goaf, but also reduce the cost and labor.

Keywords: Gob-side entry retaining, compressible pier column, surrounding rock movement, numerical simulation, pressure monitoring.

中文翻译：

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矿井巷道新型支护技术研究

摘要

为了解决煤柱损失问题，减轻煤矿采煤工作面开采紧张的情况，本研究提出了一种在采煤巷道附近采用支护体（柱）沿巷道护巷的自适应方法。通过理论分析和数值模拟研究了沿空区墩柱护巷的支护技术。结果表明，沿采空区巷道顶板活动可分为三个阶段，即一次开采影响阶段，巷道保持稳定阶段和二次开采影响阶段。通过建立顶板力学模型，推导了用于计算采空区护巷三段顶板抗割强度的方程式，并确定了支撑墩的参数。与FLAC结合^通过3D数值模拟，本研究建立了一个数值模型，研究了采空区护巷两个开采时期的围岩应力分布特征和变形规律，以及墩柱的应力和变形规律。数值结果表明，本研究采用的可压缩墩柱支撑体不仅可以在沿采空区的巷道中实现更好的固位效果，而且可以降低成本和劳力。

关键词：采空区边防，可压缩墩柱，围岩运动，数值模拟，压力监测。