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中文摘要: 针对某金属矿山超千米深TBM大断面主机组装硐室的支护问题，采用现场调查、室内试验、理论分析等方法，综合考虑深部地应力情况，研究大硐室破坏形式，基于Q系统法及抛物线拱法，提出硐室支护方式及支护参数，最后运用数值模拟方法验证支护效果。结果表明：TBM主机组装硐室破坏形式为楔形体冒顶破坏，潜在破坏区域在硐室拱顶4.2 m范围内，计算Q值1.84，提出锚杆+网片+喷砼+长锚索的支护方式及其参数；数值计算表明，支护后，巷道临空面最大位移约为3 cm，顶板与两帮剪切破坏与拉伸破坏均在锚索控制范围内，锚索未发生破坏，支护效果良好；方法充分结合现场围岩情况、深部地应力条件与硐室破坏形式，适用于金属矿深部大断面硐室支护设计。
Abstract:In order to solve the support problem of the TBM main engine assembly chamber in a metal mine with a depth of over one kilometer, by using the methods of field investigation, laboratory test, and theoretical analysis, the failure form of the large chamber was studied comprehensively considering the deep in-situ stress. Based on the Q system method and parabolic arch method, the support method and parameters of the chamber were proposed, and the support effect was verified by the numerical simulation method. The results showed that the failure form of the TBM main engine assembly chamber was wedge collapse failure, the potential failure area was within 4.2 m of the chamber vault; the calculated Q value was 1.84, and the support method of anchor bolt + mesh + jetted concrete + long anchor cable was proposed. The numerical calculation showed that the maximum displacement of the open face was about 3 cm after the support, shear failure, and tensile failure of the roof and two sides were within the control range of the anchor cable, and the anchor cable failure didn''t occur, and the support effect was good; methods fully combined with the surrounding rock condition, deep in-situ stress condition, and chamber failure form, was suitable for the support design of deep large section chamber in metal mine
文章编号： 中图分类号：TD354 文献标志码：
WANG Zhaoya.Failure forms and support design of over kilometer-deep TBM main engine assembly chamber in metal mine[J].NONFERROUS METALS(Mining Section),2023,75(5):26-35.