含水状态对硅质胶结砂岩抗拉特性的影响及颗粒流模拟

doi:10.11896/cldb.24010198

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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) PFC^3D 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.

Key words： rock mechanics Brazilian splitting test water content sandstone micro-structure discrete element method (DEM)

Published: 10 May 2025 Online: 2025-04-28

CLC number:

TU451

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	Articles by authors
	ZHU Zuoxiang
	LUO Zuosen
	LI Jianlin
	DENG Huafeng
	WANG Lehua

Cite this article:

ZHU Zuoxiang,LUO Zuosen,LI Jianlin, et al. Influence of Water-bearing State on Tensile Properties of Siliceous Cemented Sandstone and Particle Flow Simulation[J]. Materials Reports, 2025, 39(9): 24010198-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24010198 OR https://www.mater-rep.com/EN/Y2025/V39/I9/24010198

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