工程地质学报2025，Vol.33Issue(3)：845-857,13.DOI:10.13544/j.cnki.jeg.2024-0178
水岩-应力松弛耦合作用下泥岩多尺度劣化机制
MULTI-SCALE DETERIORATION MECHANISM OF MUDSTONE UNDER WATER-ROCK-STRESS RELAXATION COUPLING EFFECT
摘要
Abstract
In order to explore the deterioration mechanism of water-rock-stress relaxation coupling,a self-deve-loped water-rock coupling test device was used on the RMT-150C rock mechanics test platform.Water-rock-stress relaxation characteristics tests and uniaxial compression failure tests under different relaxation strain levels were car-ried out.Combined with nuclear magnetic resonance tests,SEM electron microscope scanning,and solution param-eter tests,the deterioration law of macro-fine-microstructure characteristics of mudstone under different damage states was analyzed.The results show that:(1)The stress relaxation of mudstone under water-rock coupling is typi-cal incomplete attenuation relaxation,including three stages:rapid,deceleration,and stable relaxation.(2)In the process of water-rock-stress relaxation,the water-rock interaction plays a leading role in the increase of the number of micro-pores,and stress relaxation causes the micro-pores to develop rapidly and connect to medium and large pores.The water-rock-stress relaxation effect leads to the transformation of the meso-structure of mudstone from smooth,dense,and few holes and fissures to uneven,loose,and developed holes and fissures.(3)During the wa-ter-rock-stress relaxation process,the pH value,TDS value,and ion concentration of the soaking solution initially increased and then stabilized with time,indicating the water-rock-stress relaxation coupling effect.In the early stage,the hydration reaction was severe,and the mineral particles were dissolved and hydrolyzed to a high degree.Subsequently,the hydration reaction slowed down into a stable state.(4)In the process of water-rock-stress relaxa-tion,mudstone degradation is progressive and interacts at the micro-fine-macro scale.Therefore,a macro-fine-micro deterioration mechanism is established.关键词
岩石力学/泥岩/水岩-应力松弛/劣化机制Key words
Rock mechanics/Mudstone/Water rock and stress relaxation/Deterioration mechanism分类
天文与地球科学引用本文复制引用
王宇,闫亮,茆苏徽,陈涛..水岩-应力松弛耦合作用下泥岩多尺度劣化机制[J].工程地质学报,2025,33(3):845-857,13.基金项目
国家自然科学基金项目(资助号:U2034203,U22A20600).This research is supported by the National Natural Science Foundation of China(Grant Nos.U2034203,U22A20600). （资助号:U2034203,U22A20600）
