昊锦塬煤矿含充填节理巷道围岩控制技术研究

发布时间：2018-03-20 12:13

  本文选题：充填节理　切入点：常法向刚度条件　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：对于地下工程岩体,节理在剪切过程中会因剪胀效应而受到周围岩体的约束作用,使节理面的法向应力增加,这反过来将抑制节理的剪胀效应,因此节理的剪切过程应视为在常法向刚度条件下进行。若节理被软弱岩土材料所充填,则充填节理往往成为岩体最容易发生剪切滑移的位置,这将显著弱化节理岩体的抗剪强度。因此研究充填节理在常法向刚度条件下的剪切破坏特征对地下工程岩体稳定性的评价及控制有重要的理论意义。本文首先考虑了影响充填节理直剪试验的几个关键因素,在此基础之上用数值模拟方法实现了充填节理在常法向刚度条件下的直剪试验。通过设置数值对比试验,分析了常法向刚度和常法向应力条件下节理剪切力学行为的异同,并对比了充填节理和非充填节理在常法向刚度条件下的剪切破坏特征,结果表明充填节理的剪切破坏模式是由岩石、充填物和两者接触面的力学属性共同控制的,充填物的存在不仅降低了节理的剪切强度,同时还改变了节理的剪切破坏模式。通过数值模拟试验还研究了节理起伏度和充填度对充填节理剪切强度的影响,结果表明节理起伏度的增加能够提高充填节理的抗剪强度,而充填度的增加则会显著降低充填节理的抗剪强度,但当充填度大于1.0后充填节理抗剪强度主要由充填物的力学属性控制,此时其抗剪强度随充填度的变化很小。本文运用FLAC3D中桩单元的锚杆支护功能,模拟研究了锚杆对充填节理剪切强度的强化作用,并分析了节理充填度和锚杆安装角度对加锚充填节理剪切强度的影响,结果表明锚杆在剪切过程中为充填节理提供了额外粘聚力和额外法向力,使加锚充填节理的抗剪强度高于充填节理的抗剪强度,且当锚杆安装角度与试块滑移角度相差较小时,锚杆的抗剪性能能够得到充分发挥。在上述研究基础之上,本文采用数值模拟方法分析了含充填节理巷道围岩的变形破坏特征,并确定了节理充填度及其分布层位对巷道围岩稳定性的影响,根据所得到的规律提出了相应的巷道围岩控制技术。现场矿压观测结果表明,该控制技术能够保证巷道围岩的稳定性。
[Abstract]:For the underground engineering rock mass, joint and is restrained by the surrounding rock by the dilatancy effect in the shearing process, and the envoys of the normal stress increase, which in turn will inhibit the dilatancy effect of joints, so the shear process of joints should be regarded as in stiffness conditions in the ordinary law. If the joint is the soft rock soil material filling, packing joints often become the rock most prone to shear slip position, this will be a significant weakening of the shear strength of jointed rock mass. So the study of filling joints in constant normal shear stiffness under the condition of damage evaluation and control characteristics on the stability of underground engineering rock mass has important theoretical significance. We first consider several key factors influencing the filling joint shear test, on the basis of numerical implementation of filling joint stiffness to shear test under the condition of direct simulation method in the ordinary law. By setting the value of the Ratio test, analysis of constant normal stiffness and constant normal shear mechanical behavior of joints should be between force conditions, and compared the filling joints and unfilled failure characteristics to shear stiffness under the condition of regular method, results show that the shear failure mode by filling jointed rock, filling and two the contact surface of the mechanical properties of joint control, filling the existence not only reduces the shear strength of joints, but also changed the joint shear failure mode. Also study the joints and filling degree of filling joint shear strength through numerical simulation. The results show that the increase of the joints can improve the shear strength of filling the joint, and increase the filling degree will significantly reduce the shear strength of joint filling, but when the filling degree is more than 1 after filling the joint shear strength is mainly controlled by the mechanical property of filling material, the anti Shear strength change with filling degree is very small. This paper uses FLAC3D pile elements in bolt supporting function, simulation of the strengthening effect of bolt on filling the shear strength of joints, and analyzes the influence of installation joint filling degree and anchor angle of anchor and filling the shear strength of joints, the results show that the bolt in the shearing process for joint filling provides additional cohesion and additional normal stress, the shear strength of the joints is higher than the filling of anchored joint filling, and when the bolt mounting angle and block slip angle difference is small, the shear performance of bolt can be brought into full play. Based on the above research, this paper analyzes the the deformation characteristics of surrounding rock with filling jointed rock tunnel numerical simulation method, and determine the joint filling degree and its distribution layer effect on the stability of surrounding rock, according to the law and put forward the corresponding The field rock pressure observation results show that the control technology can guarantee the stability of the surrounding rock of the roadway.

【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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