“钟”形采空硐室结构特征参数分析

发布时间：2018-07-13 13:24

【摘要】：古人根据长期采矿经验,在长屿硐天矿区开挖形成了无柱式"钟"形硐室,并根据NS走向和SW-NE走向地形坡度不同的情况,采用不同的断面跨度,导致硐室底部呈近似椭圆形。为深入探寻长屿硐天华玄硐群与花居硐群"钟"形硐室结构特征的科学规律,深入总结古人工程技术经验,进一步分析大型硐室群屹立千年不倒的影响因素,本文深入开展"钟"形采空硐室结构参数特征的研究,以地形坡度、硐室跨高比、硐室埋深与高度比为因素,采用FLAC进行数值模拟计算,对硐室围岩的应力以及塑性区进行了深入分析,得出了结论为:在缓坡方向,硐室跨高比宜小于1.44,硐室埋深与硐高比宜小于1.8;在陡坡方向,跨高比宜小于1.28,硐室埋深与硐高比宜小于1.8。勘查的24个硐室中有67.7%硐室符合该规律,可见古人采用了较为合理的"钟"形硐室结构形式,为洞室千年稳定奠定了良好基础。
[Abstract]:According to the long-term mining experience, the ancients formed a columnless "bell" chamber in Changyu Dongtian mining area. According to the different slope of NS strike and SW-NE strike topography, different cross-section span was adopted, which resulted in an approximate ellipse at the bottom of chamber. In order to deeply explore the scientific rules of the structural characteristics of the "bell" chamber of the Changyu Cave and Huazu Cave, and sum up the engineering experience of the ancients, the paper further analyzes the influence factors of the large cavern group standing for thousands of years. In this paper, the characteristics of structural parameters of "bell" cavern are deeply studied. Based on the factors of terrain slope, the ratio of chamber span to height, and the ratio of chamber depth to height, FLAC is used to carry out the numerical simulation calculation. The stress and plastic zone of surrounding rock of chamber are analyzed in depth. The conclusions are as follows: in the direction of gentle slope, the ratio of height to span of chamber should be less than 1.44, the ratio of buried depth to height of chamber should be less than 1.8, and the ratio of buried depth to height of chamber should be less than 1.8 in the direction of steep slope. The cross-height ratio should be less than 1.28, and the buried depth and the height ratio of the chamber should be less than 1.8. 67.7% of the 24 chambers surveyed accord with this rule. It can be seen that the ancients adopted a reasonable "bell" chamber structure form, which laid a good foundation for the stability of the tunnel chamber for the millennium.
【作者单位】：西南交通大学地球科学与环境工程学院;西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室;
【基金】：国家自然科学基金(41372293) 四川省国土资源厅科学研究计划(KJ-2014-10,KJ-2015-18,KJ-2016-8) “长江学者和创新团队发展计划”(“PCSIRT”)资助
【分类号】：TD264.3

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