三软综放沿空锚网索支护巷道回采期间围岩变形特征

针对三软综放沿空巷道围岩大变形、难支护的特点,提出采用锚网索支护新技术,通过对试验巷道数值模拟以及表面位移、围岩深部位移和围岩应力的现场监测,分析了试验巷道矿压显现活动规律,掌握了试验巷道在锚网索支护下的围岩变形规律,这为锚网索支护在三软煤层巷道的推广应用和支护参数设计提供了科学依据.

Deformation Character of Surrounding Rock for "Three Soft" Seam and Driven Roadway with Bolt-mesh-anchor Support on Fully-mechanized Caving in the Course of Mining

Based on the great deformation and difficult supporting characteristics of surrounding rocks in"Three soft"and drived gateway in fully-mechanized caving,a new bolt-mesh-anchor support technology was put forward.Through numerical simulation of FLAC3D,monitoring the surface displacement of roadway,the displacement in deep surrounding rock and the stress of surrounding rock,the ground pressure rule of the trial entry was analyzed,and the deformation regularity of the surrounding rock obtained.The sults show that the bolt-net-anchor support techniqueis suitable for the steep seam roadway.This technology has provided a basis for determining supporting parameters and socanbe used for supporting "Three soft" seam roadway.