综放回采巷道围岩力学特征实测研究

Spot Testing on Mechanical Characteristics of Surrounding Rock in Gates of Fully Mechanized Top-Coal Caving Face

通过对综放面回采巷道围岩的深部位移、表面位移、应力分布以及支架荷载的实测分析,得出综放面回采巷道围岩力学特征分布规律.研究表明,临近工作面巷道围岩处于支承压力降低区,支架荷载下降,但支架和围岩变形最剧烈,表明巷道围岩处于岩石峰后的力学状态.围岩变形主要发生支承压力影响区,合理的巷道支护应能控制采动影响剧烈阶段的围岩变形,顺槽支护设计理念应从载荷控制向变形控制转变.

The distribution patterns of mechanical characteristics for surrounding rock in the gateways of fully mechanized top-coal caving （FMTC） face were put forward by analyzing deep displacement, surface displacement, stress distribution and supports loading. The results show that the surrounding rock of the gateways lies in abutment pressure decrease zone near the working face, so that the support loads decreases. But the deformations of supports and surrounding rock are very acute. The deformation of surrounding rock appears mainly in abutment pressure influence zone. Reasonable roadway supporting should control the deformation of surrounding rock in intense stage of mining influence. Supporting design ideas of tailentry and head entry should be changed from the loading control to the deformation control.