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本文根据井口标高为+97.30米的某矿-350水平东翼部分巷道开挖后的围岩破坏形态、支护施工情况、区域地应力场特征,讨论地压呈现规律及支护问题。 一、工程地质概况 1.工程布置及岩性特征 东1采区工程围岩赋存于二叠统龙潭组厚约150米的中部地层中。拟采煤层C平均厚度约2.0米。直接顶板为炭酸钙质砂岩,底板为铝土质泥岩,均为不含水的简单型水文地质条件。煤层产状N60°E∠15°SE。根据钻孔揭示的各工程穿越岩层自下而上依次为:⑤厚约2.4米灰色粉砂岩;④灰或浅灰
In this paper, according to the failure mode, supporting construction and regional geostress field characteristics of surrounding rock after excavated in east mine wing of level -350 with a mine elevation of +97.30 meters, the law of ground pressure and the supporting problems are discussed. I. Overview of Engineering Geology 1. Engineering Arrangement and Lithological Characteristics The rock of Dong 1 mining area is hosted in the middle strata of the Permian Longtan Formation which is about 150 meters thick. The average thickness of the coal to be mined C is about 2.0 meters. The direct roof is calcium carbonate sandstone and the floor is bauxitic mudstone, all of which are simple hydrogeological conditions without water. Seam formation N60 ° E∠15 ° SE. According to the drilling revealed that the project through the rock bottom-up from top to bottom: ⑤ about 2.4 m thick gray siltstone; ④ gray or light gray