长屿硐天“钟”形采空硐室结构特点及工程意义

发布时间：2018-11-05 10:02

【摘要】：硐室形状及围岩结构是影响硐室稳定的重要因素.以浙江温岭长屿废弃矿山"钟"形采空、无支护硐室为研究对象,在勘明采空硐室形状其围岩结构类型和岩石强度的基础上,采用FLAC有限差分方法对不同形状、不同跨高比、不同硐壁倾角的硐室围岩进行了稳定性计算与分析,结果表明:"钟"形硐室优于矩形、圆形和直墙拱硐室结构,其围岩受拉区面积最小,更能发挥岩体抗压能力强的优点;跨高比越小,围岩受拉区面积越小,硐室越稳定,跨高比≤1.33时,硐室顶部围岩不出现受拉区,对围岩稳定性比较有利;硐壁倾角对围岩受拉区面积的影响呈先减小后增大的规律,当侧墙倾角70°~80°之间时,硐室围岩受拉区面积较小,对硐室稳定性最为有利;实际勘查中发现,75%的硐室跨高比小于1.33,60%的侧墙倾角集中在70°~80°之间.
[Abstract]:The shape of chamber and surrounding rock structure are important factors to influence the stability of chamber. Taking the "bell" hollow cavern without support in the abandoned mine of Changyu in Wenling, Zhejiang Province as the research object, on the basis of the exploration of the structure type of surrounding rock and the strength of rock in the shape of the cavern, the FLAC finite difference method is used to study the different shapes and the ratio of span to height. The stability of surrounding rock of chamber with different wall inclination angle is calculated and analyzed. The results show that the "bell" chamber is superior to the rectangular, circular and straight wall arch chamber structure, and its surrounding rock tensile area is the smallest, which can play the advantages of strong rock pressure resistance; The smaller the ratio of span to height, the smaller the area of surrounding rock tensile zone, the more stable the chamber. When the ratio of span to height is less than 1.33, the surrounding rock at the top of the chamber does not appear tensile zone, which is beneficial to the stability of surrounding rock. The influence of wall inclination angle on the area of surrounding rock tensile zone decreases first and then increases. When the sidewall inclination angle is between 70 掳and 80 掳, the area of surrounding rock tension zone of chamber is smaller, which is the most favorable to the stability of chamber. In the actual investigation, it is found that 75% of the sloping angle of the sidewall is between 70 掳and 80 掳, where the ratio of span to height of the chamber is less than 1.33 ~ 60%.
【作者单位】：西南交通大学地球科学与环境工程学院;浙江省工程勘察院;
【基金】：国家自然科学基金资助项目(41372293) 四川省国土资源厅科学研究计划资助项目(KJ-2014-10) 长江学者和创新团队发展计划资助项目(PCSIRT)
【分类号】：TD264.3

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