深部综放大断面沿空掘巷小煤柱尺寸优化及控制技术

Dimension Optimization of Small Coal-pillar for Protecting Large-section Roadway Driven along Gob in Deep Full-mechanized Caving Mining Face

针对深部综放大断面沿空掘巷小煤柱宽度确定的难题,以东滩煤矿沿空巷道小煤柱尺寸确定为例,首先通过对小煤柱力学模型分析确定小煤柱宽度应大于2.74m;然后经过数值模拟研究不同尺寸小煤柱下巷道围岩的变形规律,确定小煤柱合理尺寸为4m左右;提出合理的围岩控制技术。现场试验表明,生产期间小煤柱稳定性较好,沿空掘巷整体稳定,变形量得到了有效控制。

In order to rational confirm width of coal-pillar for large-section roadway driven along gob in deep full-mechanized caving mining face of Dongtan Colliery, firstly, the width of small coal-pillar was calculated to shall be larger than 2. 74m by mechanics mod- el analysis, secondly, deformation rule of surrounding rock of roadway with different widths was simulated numerically to shall be a- bout gin. Rational control technology of surrounding rock was put forward. On-the-spot test showed that small coal-pillar in mining was wholly stable and roadway deformation was effectively controlled.