论文部分内容阅读
针对已有围岩松动圈理论和数值模拟技术在研究矩形断面巷道围岩松动区范围的不足,运用深基点多点位移和钻孔窥视相结合的方法,对澄合矿区王村、王斜、二矿及董家河4个矿井主要采区巷道围岩松动范围进行了现场实测,得到了不同岩性条件下围岩松动范围与巷道埋深、断面尺寸、围岩强度及考虑各影响因素的不同预测公式。结果表明:当矩形巷道断面尺寸一定时,顶板平均松动厚度与巷道埋深成正增长关系,与顶板围岩抗压强度成反增长关系;当矩形巷道埋深一定时,顶板平均松动厚度与巷道的跨高比成正增长关系,与顶板岩石的拉压强度比成反增长关系;当两帮岩性一定时,矩形巷道两帮平均松动范围与巷道埋深成正增长关系,而与巷道跨度成线性正比例增长关系。将所得围岩松动范围预测公式运用于王村矿井13503工作面运输平巷的现场支护试验,取得了良好的围岩控制效果。
Aiming at the shortcomings of the loose ring theory and numerical simulation technology of existing surrounding rock in studying the range of rock loosening area in the rectangular section of roadway, by combining the method of multi-point displacement of deep base and drilling peep, Two mine and Dongjiahe 4 mine main roadway surrounding rock loosening range of field measurements were made under different lithology rock loosening range and tunnel depth, section size, rock strength and taking into account the various influencing factors of different predictions formula. The results show that when the rectangular section has a certain cross-sectional dimension, the average loose thickness of the roof is positively related to the depth of the tunnel, which is inversely proportional to the compressive strength of the surrounding rock. When the depth of the rectangular tunnel is constant, The ratio of tensile and compressive strength of roof rocks increases inversely with the ratio of tensile and compressive strength of roof rock; when the two groups of lithology are certain, the average looseness range of two gangs of rectangular roadway is positively related to the depth of roadway, and is linearly proportional to the span of roadway Increase the relationship. The prediction formula of loosening range of surrounding rock was applied to the on-site support experiment of 13353 face roadway in Wangcun Mine, and good surrounding rock control effect was obtained.