深部高应力下花岗岩力学损伤的孔隙水压影响  

Effect of Pore Water Pressure on Mechanical Damage of Granite under Deep High Stress

作　　者：云丽 张志龙[1,2] 刘洋 张安林 张朝鹏 YUN Li;ZHANG Zhilong;LIU Yang;ZHANG Anlin;ZHANG Zhaopeng(College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China;MOE Key Laboratory of Deep Earth Science and Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水利水电学院,成都610065 [2]四川大学深地工程智能建造与健康运维全国重点实验室,成都610065 [3]四川大学深地科学与工程教育部重点实验室,成都610065

出　　处：《实验室研究与探索》2025年第1期158-163,共6页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(52125402)。

摘　　要：为探究深地原位环境下孔隙水压力对岩样损伤破坏过程的影响机制,对花岗岩岩样开展了一系列三轴压缩实验,并从力学损伤和能量角度对实验数据进行分析。研究表明,孔隙水压力的劈裂和软化作用显著降低了岩样的整体强度,且劣化作用在损伤应力处及其附近最为显著;从能量耗散角度分析,孔隙水压力使岩样整个变形过程中用于内部结构损伤劣化的耗散能急剧增加,尤其是变形后期,耗散能的释放速率大幅度提升,破坏使更多的弹性能瞬间转化为耗散能,从而显著增强了岩样的破坏脆性。在涉水工程和深地工程实践中,应充分考虑高孔隙水压对围岩的劣化影响,并采取相应的预防与监测措施,确保工程安全。In order to explore the mechanism underlying the impact of pore water pressure on the process of damage and failure in rock specimens within a deep ground in-situ environment,a series of triaxial compression tests were carried out on granite samples.Then,the experimental data were analyzed from the perspective of mechanical damage and energy.The results show that the splitting and softening effects of pore water pressure significantly reduce the overall strength of the rock specimens,and the deterioration effect is most severe at and near the damage stress.At the same time,a sharp increase is induced by pore water pressure in the dissipated energy(used for the degradation of the rock structure)during specimens’entire deformation process.In the later stages of deformation,the release rate of dissipated energy surging evidently and more elastic energy is instantaneously converted into dissipated energy at the time of specimens’failure.As a result,the brittleness of the rock’s failure is greatly enhanced.Therefore,the effect of high pore water pressure on the deterioration of surrounding rock should be fully considered in the practice of wading projects and deep ground projects,and corresponding prevention and monitoring measures should be taken to ensure the safety of projects.

关 键 词：深部岩石 高应力 孔隙水压 变形损伤 能量演化 

分 类 号：TU45[建筑科学—岩土工程]