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Numerical simulation of weathered granite considering microporosity and mechanical parameter variations

Zhao Kang, Liu Yang, Ma Chao, Yan Yajing, Feng Yincheng, Tian Xiangqing, Chen Tong

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 2

art. no. e119, 2024

To study the deterioration of the mechanical properties of weathered granite and its damage characteristics under load, this paper carries out uniaxial compression and numerical simulation experimental research on fresh and weathered granite. The mechanical properties of fresh and weathered granite under uniaxial compression were analyzed, and the damage characteristics of weathered granite were revealed. Numerical models of different weathering degrees of the specimens were established based on FLAC3D, and at the same time, based on considering the distribution characteristics of granite microporosity, a random distribution model of weathered granite microporosity was established, and the deformation and damage laws of granite were obtained by numerical simulation. The results show that in the model considering the change of mechanical parameters of the rock in the weathering layer, the brittle tensile damage mainly occurs when the rock is not weathered. As weathering continues, the model undergoes brittle tensile and shear composite damage and gradually transitions to a damage pattern dominated by shear damage, which occurs when the rock strength deteriorates to about half of the fresh rock strength. In the model that jointly considers the mechanical parameters of rock microporosity and weathering layer, the microporosity affects the stress distribution to a certain extent, which leads to the change of the model strength and deformation damage characteristics. The damage form is closer to the real weathered rock damage, and the results of the study can provide a reference for the damage mode of weathered granite.