滇西铅锌矿软岩巷道变形及支护技术研究

发布时间：2018-02-02 02:36

本文关键词： 软岩巷道数值模拟原位直剪试验巷道支护锚索　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：软岩巷道的支护一直是困扰矿山的一大问题,本文以滇西铅锌矿860主平硐变形最严重的120m-150m范围的巷道为研究对象,通过原位直剪试验与室内岩石物理力学试验得出岩体(石)物理力学参数,并对得到的数据进行整理计算。通过结合现场勘测结果,利用三维有限差分FLAC3D数值模拟软件,分析其开挖后巷道变形情况。并针对该地质条件下的巷道提出三种包括锚索在内的支护方式。从应力、位移、塑性区等方面对三种方案进行了对比分析,确定最优支护方案,为以后该矿山的类似地质条件下的巷道支护提供一定借鉴意义与参考价值。本文的主要内容如下:(1)对软岩巷道,特别是千枚岩巷道的变形特点进行了分析总结。(2)对极为破碎的千枚岩岩体完成了原位直剪试验,并通过原位直剪试验得到了千枚岩岩体的物理力学参数。通过室内岩石力学试验得到灰岩岩石物理力学参数,然后依据霍克布朗准则,确定岩体力学参数。(3)依据现场勘探资料,对变形最严重的的30m巷道使用FLAC3D数值模拟软件进行建模。研究在软岩地质条件下开挖巷道的应力重新分布规律以及变形规律,并对其现有支护手段进行评价。(4)列举了锚杆(索)的主要支护理论,并针对实际地质条件结合模拟结果确定了适用于该矿山的围岩强度强化理论。(5)利用设计手册及工程类比法对该巷道提出三种支护方案,利用FLAC3D对三种支护条件下的巷道进行模拟,并与现有的支护条件进行对比分析。得出不同支护方式下的支护效果,为矿山选择合理的支护形式提供一定的依据。
[Abstract]:The support of soft rock roadway has always been a big problem in mine. This paper takes the most serious deformation of 860 main adit in West Yunnan Pb-Zn Mine as the research object. The physical and mechanical parameters of rock mass (stone) are obtained by in-situ direct shear test and laboratory rock physical and mechanical test, and the obtained data are sorted out and calculated. By using 3D finite difference FLAC3D numerical simulation software, the deformation of roadway after excavation is analyzed, and three kinds of supporting methods, including anchor cable, are put forward for the roadway under this geological condition. The plastic zone and other aspects of the three schemes are compared and analyzed to determine the optimal support scheme. For the mine in the future similar geological conditions of roadway support to provide certain reference and reference value. The main content of this paper is as follows: 1) soft rock roadway. Especially, the deformation characteristics of phyllite roadway are analyzed and summarized. The physical and mechanical parameters of phyllite rock mass are obtained by in-situ direct shear test, and the physical and mechanical parameters of limestone rock are obtained by laboratory rock mechanics test. The mechanical parameters of rock mass are determined on the basis of field exploration data. The FLAC3D numerical simulation software is used to model the 30m roadway with the most serious deformation. The stress redistribution and deformation law of the roadway excavated under the soft rock geological conditions are studied. The main supporting theory of anchor rod (cable) is listed in this paper. According to the actual geological conditions combined with the simulation results, the strengthening theory of surrounding rock strength for the mine is determined. (5) using the design manual and the engineering analogy method, three support schemes for the roadway are put forward. The roadway under three kinds of supporting conditions is simulated by FLAC3D, and compared with the existing supporting conditions, and the support effect under different supporting modes is obtained. It provides a certain basis for the mine to choose a reasonable supporting form.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353;TD322

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