酸蚀作用下预制裂隙岩石单轴压缩力学特性研究

摘要/Abstract

摘要： 为探究酸蚀作用下预制裂隙倾角对含裂隙砂岩单轴压缩性能的影响,开展pH=2溶液浸泡试验和单轴压缩试验,并结合Weibull分布有限元模型模拟裂纹扩展.结果表明:低角度裂隙(0°、30°)试样酸蚀后力学性能显著劣化,破坏模式由单一张拉破坏转为剪切-拉伸混合破坏,胶结物溶蚀导致内部结构弱化;高角度裂隙(45°、60°)试样因裂隙尖端钝化及剪切裂纹网络形成,抗压强度提升呈现非单调响应.数值模拟与试验结果一致,揭示酸蚀为矿物溶解、应力场重分布及裂隙闭合效应调控破坏过程,泊松比升高表明岩石脆性降低.

关键词: 酸蚀作用, 单轴压缩, 裂隙倾角, 数值模拟, 损伤模型

Abstract: To investigate the effect of prefabricated fracture inclination angle on the uniaxial compression performance of sandstone containing fractures under acid corrosion, dipping experiments in pH=2, uniaxial compression test, and crack propagation were simulated using Weibull distribution finite element model. The results indicated that the mechanical properties of specimens with low-angle cracks (0° and 30°) significantly deteriorate after acid corrosion, and the failure mode change from single tensile failure to shear tensile mixed failure. The dissolution of the cement lead to the weakening of the internal structure. In contrast, specimens of high-angle cracks (45°, 60°) exhibit non-monotonic response in compressive strength enhancement due to passivation of crack tips and formation of shear crack networks. The numerical simulation is consistent with the experimental results, revealing that acid corrosion regulates the failure process through mineral dissolution, stress field redistribution, and crack closure effects. An increase in Poisson’s ratio indicates a decrease in rock brittleness.

Key words: acid corrosion, uniaxial compression, crack inclination angle, numerical simulation, damage model

中图分类号:

TB301

盛捷, 雷嵘, 唐兴昌, 邹仁, 吴云鹏, 高启栋. 酸蚀作用下预制裂隙岩石单轴压缩力学特性研究[J]. 兰州理工大学学报, 2025, 51(6): 18-28.

SHENG Jie, LEI Rong, TANG Xing-chang, ZOU Ren, WU Yun-peng, GAO Qi-dong. Study on the uniaxial compression mechanical properties of rocks with pre-existing fracture under acid corrosion[J]. Journal of Lanzhou University of Technology, 2025, 51(6): 18-28.

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