不同卸荷路径下岩石卸荷破坏的能量演化规律（英文）

发布时间：2018-10-18 10:51

【摘要】：基于岩石能量交换原理和3种不同卸荷路径下(恒轴压卸围压、加轴压卸围压、轴压围压同时卸载)卸围压(初始围压为10 MPa、20 MPa、30 MPa)试验,研究卸荷条件下岩石轴向吸收应变能、环向扩容消耗应变能、弹性应变能以及耗散能的演化特征与演化速率。研究结果表明,3个方案中,岩石轴向吸收的应变能主要转化为环向扩容消耗应变能,扩容程度为:方案3方案1方案2,而转化为耗散能较少,只有在临近破坏时耗散能才明显增加。初始围压对轴向应变能、环向扩容消耗应变能及弹性应变能的影响程度明显大于卸载路径,且都随着初始围压的增大呈近似线性增加。卸载路径和初始围压对耗散能有显著的影响。三个方案中应变能的演化速率均随着初始围压的增大而增加,初始围压对应变能演化速率的影响与卸载路径有关。
[Abstract]:Based on the principle of rock energy exchange and the tests of unloading confining pressure (initial confining pressure is 10 MPa,20 MPa,30 MPa) under three different unloading paths (constant axial pressure unloading, axial pressure unloading at the same time), the axial absorption strain energy of rock under unloading condition is studied. The evolution characteristics and rate of strain energy, elastic strain energy and dissipation energy in toroidal expansion are discussed. The results show that the strain energy absorbed in the axial direction of rock is mainly transformed into the strain energy consumed by circumferential expansion, and the expansion degree is as follows: scheme 3, scheme 1, option 2, but the conversion to dissipative energy is less. The dissipative energy increases significantly only when the damage is near. The influence of initial confining pressure on axial strain energy, toroidal expansion consumption strain energy and elastic strain energy is obviously greater than that of unloading path, and both increase approximately linearly with the increase of initial confining pressure. Unloading path and initial confining pressure have significant effects on dissipation energy. The evolution rate of strain energy increases with the increase of initial confining pressure, and the influence of initial confining pressure on the evolution rate of strain energy is related to the unloading path.
【作者单位】：中南大学资源与安全工程学院;
【基金】：Project(51324744)supported by the National Natural Science Foundation of China Project(71380100006)supported by the Innovation Foundation of Doctoral Student in Hunan Province,China
【分类号】：TU45

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