沿空掘巷应力动态变化规律研究

Study of dynamic stress change law of roadway driving along next goaf in mine

针对沿空掘巷应力动态变化问题,以张双楼煤矿沿空掘巷为例,采用钻屑法得出走向方向煤层应力动态变化特征,并对变化特征进行分析。根据实测和分析得出,受到岩性、地质构造和顶板呈现的"O-X"破断影响,采空侧煤体应力峰值呈现周期性出现,周期距离等于周期来压步距;受到采空侧围岩应力状态、巷道掘进引起的应力重新分布和覆岩运动的共同作用,沿空巷道实体煤中应力变化不一,或降低或增高或转移。沿空掘巷的应力变化特征对于防冲卸压计划安排和冲击矿压防治工作具有重要指导意义。

Aiming at the dynamic stress changes of roadway driving along goaf in mine, we use the method of drill cutting to get the dynamic change characters of seam stress along the strike direction of roadway and analyzed the variation characteristics of roadway driving along next goaf in Zhangshuanglou Coal Mine. According to the observation and analysis, it is shown that the peak of coal stress affected by lithology, geological structure and the 'O-X' broken feature of roof, appears periodically; and the cycle length is equal to the periodic weighting step distance. Effected by the stress state of surrounding rock, the new stress distribution induced by the roadway excavation and the overlying strata movement, the solid stress of coal in roadway driving along goaf varied with reduction, increase or transfer. The stress variation characteristics can be used to guide pressure relief plan of rockburst and rockburst prevention and control work significantly.