水—岩耦合作用下花岗岩力学特性试验研究
发布时间：2019-01-02 17:52
【摘要】：深部围岩在高围压和高孔隙水压力条件下所表现出来特殊的力学性质一直是影响煤矿深部开挖的问题,也是岩石力学需要解决的关键问题。选取花岗岩为研究对象,通过室内试验模拟岩石在深部时的水-岩耦合条件,对花岗岩的强度和变形特性进行了研究。基于试验结果,以能量原理为基础分析了花岗岩变形破坏全过程,主要的研究内容如下：通过四组围压和四组孔隙水压力对比试验的结果,分析得出水-岩耦合作用时围压对花岗岩强度的影响要远大于孔隙水压力。引用有效应力的概念,分析了有效围压对花岗岩有效峰值强度的作用效果,得出水-岩耦合作用下花岗岩有效峰值强度与有效围压为二次函数的关系,花岗岩有效剪切强度和有效正应力基本符合摩尔库伦强度准则,而且可以通过有效峰值强度折减系数来描述孔隙水压力对有效峰值强度的折减效果。通过分析不同水-岩耦合作用条件下体积应变与应力的关系,得出水-岩耦合作用下花岗岩扩容起点随着围压的增大而发生滞后,随着孔隙水压力的增大而有提前现象。以应变软化参数为中间桥梁,对水-岩耦合作用下花岗岩峰后应变软化阶段的力学参数进行分析,得出随着应变软化参数的增大广义粘聚力不断减小,相同应变软化参数对应的广义内摩擦角随着孔隙水压力的增大也有减小趋势,广义内摩擦角基本保持不变。在对水-岩耦合作用下花岗岩基本力学特性有了初步了解的基础上,以能量原理为基础对水-岩耦合作用下花岗岩的变形破坏全过程进行了解释,然后对基于能量原理破坏准则的参数进行修正,得出了适用于水-岩耦合作用下花岗岩的破坏准则。将水-岩耦合作用下理论计算的花岗岩破坏强度与试验结果和霍克-布朗破坏准则计算结果的进行对比,得出了修正后基于能量原理的破坏准则是偏安全的,可以作为以后工程应用的理论基础。
[Abstract]:The special mechanical properties of deep surrounding rock under the condition of high confining pressure and high pore water pressure are always the problems that affect the deep excavation of coal mine and are also the key problems to be solved in rock mechanics. The strength and deformation characteristics of granite were studied by laboratory experiments to simulate the water-rock coupling condition in the deep part of the rock. Based on the experimental results, the whole process of granite deformation and failure is analyzed on the basis of energy principle. The main research contents are as follows: through four groups of confining pressure and four groups of pore water pressure contrast test results, The influence of confining pressure on the strength of granite is much greater than that of pore water pressure. Based on the concept of effective stress, the effect of effective confining pressure on the effective peak strength of granite is analyzed, and the relationship between the effective peak strength of granite and the effective confining pressure of granite under the coupling of water and rock is obtained. The effective shear strength and effective normal stress of granite basically accord with the Moore Coulomb strength criterion, and the effective peak strength reduction coefficient can be used to describe the reduction effect of pore water pressure on effective peak strength. Based on the analysis of the relationship between volume strain and stress under different water-rock coupling conditions, it is concluded that the starting point of granite expansion lags with the increase of confining pressure and advances with the increase of pore water pressure. Taking the strain softening parameter as the intermediate bridge, the mechanical parameters of the post-peak strain softening stage of granite under water-rock coupling are analyzed. It is concluded that the generalized cohesive force decreases with the increase of the strain softening parameter. The generalized internal friction angle corresponding to the same strain softening parameters also decreases with the increase of pore water pressure, and the generalized internal friction angle remains basically unchanged. Based on the preliminary understanding of the basic mechanical properties of granite under water-rock coupling, the whole process of deformation and failure of granite under water-rock coupling is explained on the basis of energy principle. Then the parameters of the failure criterion based on the energy principle are modified and the failure criterion for granite under water-rock coupling is obtained. By comparing the calculated failure strength of granite under water-rock coupling with the experimental results and the calculated results of Hawk-Brownian failure criterion, it is concluded that the modified failure criterion based on the energy principle is relatively safe. It can be used as the theoretical basis of engineering application in the future.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU45
本文编号：2398791
[Abstract]:The special mechanical properties of deep surrounding rock under the condition of high confining pressure and high pore water pressure are always the problems that affect the deep excavation of coal mine and are also the key problems to be solved in rock mechanics. The strength and deformation characteristics of granite were studied by laboratory experiments to simulate the water-rock coupling condition in the deep part of the rock. Based on the experimental results, the whole process of granite deformation and failure is analyzed on the basis of energy principle. The main research contents are as follows: through four groups of confining pressure and four groups of pore water pressure contrast test results, The influence of confining pressure on the strength of granite is much greater than that of pore water pressure. Based on the concept of effective stress, the effect of effective confining pressure on the effective peak strength of granite is analyzed, and the relationship between the effective peak strength of granite and the effective confining pressure of granite under the coupling of water and rock is obtained. The effective shear strength and effective normal stress of granite basically accord with the Moore Coulomb strength criterion, and the effective peak strength reduction coefficient can be used to describe the reduction effect of pore water pressure on effective peak strength. Based on the analysis of the relationship between volume strain and stress under different water-rock coupling conditions, it is concluded that the starting point of granite expansion lags with the increase of confining pressure and advances with the increase of pore water pressure. Taking the strain softening parameter as the intermediate bridge, the mechanical parameters of the post-peak strain softening stage of granite under water-rock coupling are analyzed. It is concluded that the generalized cohesive force decreases with the increase of the strain softening parameter. The generalized internal friction angle corresponding to the same strain softening parameters also decreases with the increase of pore water pressure, and the generalized internal friction angle remains basically unchanged. Based on the preliminary understanding of the basic mechanical properties of granite under water-rock coupling, the whole process of deformation and failure of granite under water-rock coupling is explained on the basis of energy principle. Then the parameters of the failure criterion based on the energy principle are modified and the failure criterion for granite under water-rock coupling is obtained. By comparing the calculated failure strength of granite under water-rock coupling with the experimental results and the calculated results of Hawk-Brownian failure criterion, it is concluded that the modified failure criterion based on the energy principle is relatively safe. It can be used as the theoretical basis of engineering application in the future.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU45
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