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以绿片岩和大理岩组成的层状岩体为研究对象,采用FLAC3D对其进行加载和卸荷条件下的力学特性的数值分析。研究结果表明:若进行峰前恒轴压卸围压试验时,卸荷初始偏差应力对岩石卸荷破坏时的应力水平和变形有着明显的影响;若进行峰前升轴压卸围压试验时,应力增量比对岩石卸荷破坏时的应力水平和变形有着明显的影响;应力途径对岩石的强度和变形的影响极小;应力途径对层状岩体的强度的影响极小,但对层状岩体的变形的影响比较明显。
The layered rock mass composed of greenschist and marble is taken as the research object, and the numerical analysis of the mechanical properties under the loading and unloading conditions by FLAC3D is carried out. The results show that when the pre-peak constant-axis unloading and confining pressure test is carried out, the initial unloading stress has a significant effect on the stress level and deformation of rock under unloading failure. , And the stress increment ratio has a significant effect on the stress level and deformation of the rock during the unloading failure. The stress path has little effect on the rock strength and deformation. The stress path has little effect on the strength of the layered rock mass. The influence of stratified rock mass deformation is obvious.