Influence of Water-bearing State on Tensile Properties of Siliceous Cemented Sandstone and Particle Flow Simulation
ZHU Zuoxiang1,2, LUO Zuosen1,2,*, LI Jianlin1,2, DENG Huafeng1,2, WANG Lehua1,2
1 Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education, Yichang 443002, Hubei, China 2 College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, Hubei, China
Abstract: To explore the relationship and influence mechanism between the change of microstructure characteristics and tensile properties of water-bea-ring sandstone cementation, the Brazilian splitting test and microstructure test were carried out to siliceous cemented sandstone under diffe-rent water-bearing conditions in the Three Gorges Reservoir area. Based on the indoor test results, a particle flow numerical simulation method for cementation softening of water-bearing sandstone was proposed to fulfil the sandstone splitting simulation analysis. The results show that: (1) The water-bearing state affects the tensile strength and failure characteristics of sandstone. From dry to saturated state, sandstone tensile strength decreased by 49.93%, and the failure mode changed from straight fracture along the midline to curved fracture along the midline. (2) The microscopic test results show that with the increase of water content, the failure mode of transgranular fracture of sandstone splitting section gradually decreases, and it is transformed into the composite failure mode of transgranular fracture and intergranular fracture, which well explains the variation in macroscopic failure characteristics of sandstone with water content. (3) There are two kinds of siliceous cements in the tested sandstone cements, namely, the proliferative type and the precipitated type. The proliferative type is generally not affected by water content, while the precipitated type is easily softened by water. This is a major reason for the change in the tensile strength of sandstone with water content. (4) PFC3D simulation results show that with the increase of the softening degree of precipitated cementation, the crack initiation point of the sample gradually advances, the precipitated cementation fracture gradually replaces the proliferative cementation fracture, and the maximum cementation contact force decreases continuously, then the final tensile strength shows a decreasing trend.
朱作祥, 骆祚森, 李建林, 邓华锋, 王乐华. 含水状态对硅质胶结砂岩抗拉特性的影响及颗粒流模拟[J]. 材料导报, 2025, 39(9): 24010198-9.
ZHU Zuoxiang, LUO Zuosen, LI Jianlin, DENG Huafeng, WANG Lehua. Influence of Water-bearing State on Tensile Properties of Siliceous Cemented Sandstone and Particle Flow Simulation. Materials Reports, 2025, 39(9): 24010198-9.
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2025, Vol. 39 
