【作者】 魏建军；

【导师】 蒋斌松；

【作者基本信息】 中国矿业大学 ， 岩土工程， 2013， 博士

【摘要】 在深部煤矿高应力巷道的支护问题至今尚没有完全解决，特别是高应力破碎围岩巷道的支护问题日益突出，围岩控制困难，严重影响安全生产和施工成本。对高应力巷道稳定性机理及控制技术进行研究，对工程应用现实意义巨大。因此，本文以钱家营矿八采区轨道下山为工程背景，采用数值模拟、理论分析、实验室模拟试验和现场实测与工业性试验等手段，系统研究了深部高地应力巷道的大刚度强力支架-锚索协调支护机理与控制技术，并将研究成果成功应用到高应力破碎软岩巷道的工程实践中，取得了如下主要的创新性成果：（1）进行了粉砂岩三轴压缩的分级加载蠕变试验，提出了一种由广义开尔文体和非线性黏塑性体NVPB串联的蠕变力学模型，并推导了该蠕变模型的本构方程，基于蠕变试验结果采用非线性回归分析辨识了该模型的5个参数。将其编制成子程序代入ABAQUS中分析了巷道变形规律及锚网喷支护和钢架被动支护控制围岩稳定失效原因。（2）在主次承载区理论基础上提出了大刚度支架-锚索协调支护的思想，建立了支架-锚索协调承载的力学模型，研究了不同工况下支护结构的稳定性，提出了锚索协调支护的原则。并进一步基于圆形巷道考虑应变软化的弹塑性分析确定了锚索设计的长度及支护时机。（3）借助物理模拟实验与数值模拟手段分析了钢管混凝土支架的承载性能，得到了钢管混凝土支架-锚索支护结构在不同工况下的应力分布规律和变形特征，讨论了支架参数对支架承载性能的影响规律，给出了钢管混凝土支架-锚索协调支护设计要点。（4）采用数值分析方法研究了钢管混凝土支架-锚索协调支护结构控制围岩稳定机理，得到了巷道围岩塑性区随支护结构与荷载步的变化规律，揭示了锚索预应力对巷道围岩稳定的控制作用。（5）针对钱家营矿八采区轨道下山巷道存在的问题，依据大刚度钢管混凝土支架-锚索协调支护理论与技术，确定了“锚网喷初期支护+预留变形空间+支架背后背板填充+钢管混凝土支架+锚索协调”的支护方案。工程实践表明：该方案有效地控制了围岩的剧烈变形，保证了巷道的稳定。更多还原

【Abstract】 The support problems of high stress roadway in the deep coal mine have not beensolved completely so far, and the support problems of the high stress broken surroundingrock are increasingly prominent especially. The difficulty of surrounding rock control has astrong impact on the safety production and construction costs. There is great significance inresearching the stability mechanisms and control technology of high stress roadway forengineering application. Consequently, taking the railway downhill of eighth mining area inQian Jiaying mine for the engineering background, the coordinate support mechanisms andcontrol technology of high stiffness support and anchor cable in deep high stress roadwaywere studied systematically by the methods of numerical simulation, theoretical analysis,laboratory simulation test, field measurement and industrial practice. And the achievementswere successfully applied in high stress broken surrounding rock of roadway. The maininnovative achievements are as follow:(1) The triaxial compression creep tests of siltstone were carried out. The tandem creepmechanics model of generalized Kelvin and nonlinearity viscoplastic body NVPB wasproposed firstly, and the constitutive equation of creep model was deduced. The5parameters of this model were identified by nonlinear regression analysis based on creep testresults. The subroutines secondary developed was taken to the finite element softwareABAQUS to analyze the deformation rules of roadway and the stability failure cause ofpassive support steel frame.(2) The ideology of high stiffness support and anchor cable coordinate support wasproposed on the basis of primary and secondary bearing zone theory, and the mechanicalmodel of support and anchor cable coordinate support was also established, and the stabilityof the support structures in different working conditions were studied, and the principle ofanchor cable coordinate support was proposed. Based on the strain softening elastic-plasticanalysis of circular roadway, the design length of anchor cable and support time wasconfirmed.(3) The capacity of concrete filled steel tube support was analyzed by physicalsimulation test and numerical simulation methods. The stress distribution laws anddeformation behaviors of concrete filled steel tube support and anchor cable were achievedin different working conditions, and the design key points of concrete filled steel tubesupport and anchor cable support were achieved by discussing the influence rules of supportparameters on bearing capacity. (4) The numerical analysis method is adopted to study the stability mechanisms ofsurrounding rock with concrete filled steel tube support and anchor cable coordinate supportstructure, and the change laws of plastic zone with the support structure and load steps wereobtained, revealing the control effects of anchor cable prestress over the surrounding rock.(5) For the existing problems of the railway downhill of eighth mining area in QianJiaying mine, the coordinating support scheme including primary bolt-mesh-shotcretesupport, reserving deformation space, back filling of frame, concrete filled steel tube supportand anchor cable was confirmed based on the theories and techniques of high stiffnessconcrete filled steel tube support and anchor cable coordinate support. The engineeringpractice showed that the coordinating support scheme could effectively control the severedeformation and ensure the stability of surrounding rock.更多还原