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为了描述围压对非均质岩石剪胀扩容行为的影响,通过扩容指数建立了剪胀角和围压之间的关系式.利用Weibull分布考虑岩石力学参数的非均质性,假设岩石为理想弹塑性材料,建立了考虑围压影响的非均质岩石剪胀扩容模型,并在FLAC软件下利用Fish函数法予以实现.数值算例按3种方案研究了不同侧限下平面应变煤样的破坏行为,结果表明:1)剪胀角对岩石力学承载能力的发挥有一定影响.在其他条件一定的情况下,剪胀角增加会使得岩石的强度略有提高.2)随着剪胀角增加,岩石破坏单元的体积膨胀变大,剪切带面积也增大.3)本文模型能反映围压对岩石剪胀扩容行为的影响.
In order to describe the influence of confining pressure on the dilatancy and expansion behavior of heterogeneous rock, the relation between dilatancy angle and confining pressure is established by the expansion exponent.Using the Weibull distribution to consider the heterogeneity of rock mechanics parameters, it is assumed that the rock is ideal Elastic-plastic material, a model of heterogeneous rock dilatancy and expansion considering the influence of confining pressure is established and implemented by using FLAC software with Fish function method. Numerical examples are studied by three schemes of plane strain coal specimens with different confinement The results show that: 1) The dilatancy angle has a certain influence on the bearing capacity of rock mechanics. Under other conditions, the dilatancy angle will increase the strength of the rock slightly.2) With the dilatancy angle The volume expansion of the rock failure unit increases and the shear zone area also increases.3) The model can reflect the influence of confining pressure on the dilatancy and expansion of rock.