【作者】 黎明镜；

【导师】 荣传新；

【作者基本信息】 安徽理工大学 ， 岩土工程， 2010， 硕士

【摘要】 深部岩体处于高地应力、高地温、高岩溶水压和强烈采掘扰动的复杂环境,其非线性大变形动力现象极为突出,导致深部资源开采中重大灾害事故增多,使得深井巷道经常需要返修和重新支护。因此有必要对深井巷道热力耦合作用下围岩的变形特征及围岩长期变形规律进行深入研究。本文采用有限元程序ANSYS计算了不同通风工况下围岩的温度场分布,对深井巷道开挖后围岩的应力和变形进行热力耦合数值模拟,并结合现场实测结果,计算了围岩变形的时间效应,数值计算结果与实测值吻合程度较好。计算结果表明考虑热力耦合作用计算的巷道围岩应力比不考虑耦合作用时要增大约4MPa,巷道围岩变形量增大约26%左右,最大应力差值位于径向深度约为1.5m处。热力耦合对围岩应力和位移的影响在径向深度为0-7.6m的范围内影响较为显著；径向深度在7.6m-14m范围内,影响很小；径向深度大于14m,则可视为无影响。实测结果表明,深井巷道围岩长期变形在开挖30天左右的时间内,变形速率较快,变形特征对应于岩石蠕变曲线中的初始蠕变阶段；巷道开挖30天后,变形速率开始逐渐变小,围岩变形特征对应于稳定蠕变阶段。同时根据围岩变形实测结果,对深井巷道围岩进行动态加固,确保了深井巷道工程的施工和运营安全。图[70]表[3]参[42]更多还原

【Abstract】 Deep rock mass is in a complex environment of high stress, high temperature, high seepage flow pressure and intensive extraction perturbation, The nonlinear large deformation dynamic has been striking which leading to serious disasters and accidents increase in mining of deep resources, often making deep roadway repair and re-support. Therefore, it is necessary to study the deformation characteristic and long-term deforming rule of surrounding rock of deep mine roadways with thermo-mechanical coupling.Based on the finite element software ANSYS, the temperature distribution of the surrounding rock under different ventilation working conditions is calculating. Then the stress and deformation of the surrounding rock after excavation are analyzes using thermodynamic couple method, and coupled with the in-situ measured results, the time effect of the surrounding rock deformation is calculated. The numerical calculation results have been compared with the measured values and good agreement is obtained.Results indicate that:considering the thermo-mechanical coupling, the surrounding rock stress is 4Mpa bigger than uncoupling, the surrounding rock deformation will be almost 26% larger. The maximum difference stress is pivoted at radial depth 1.5 meters. The influence of thermo-mechanical coupling on surrounding rock stress and deformation is remarkable at radial depth of 0 to 7.6 meters, little at radial depth of 7.6 to 14 meters, nothing at radial depth more than 14 meters.Actual measurement show that, during the first thirty days after excavation of deep mine roadways, the rate of deformation is fast, and the deformation characteristic corresponds to primary creep stage of the rock creep curves; after thirty days, the rate of deformation drops and the deformation characteristic corresponds to steady creep stage. According to the measured results of rock deformation, we reinforce the roadways in time if necessary, to make sure the safety of deep mine roadways during construction and production.Figure [71] table [3] reference [42]更多还原