高围压下深部大理岩变形特性与能量演化试验研究  

Experimental study on deep marble deformation characteristics and energy evolution under high confining pressure

作　　者：王卿 王振清[1] 陈叶青 李春海 WANG Qing;WANG Zhenqing;CHEN Yeqing;LI Chunhai(Harbin Engineering University,Harbin 150001,China;Defense Engineering Institute,AMS,PLA,Beijing 100850,China)

机构地区：[1]哈尔滨工程大学,黑龙江哈尔滨150001 [2]军事科学院国防工程研究院,北京100850

出　　处：《防护工程》2023年第2期7-15,共9页Protective Engineering

摘　　要：岩石材料受力变形破坏与能量的演化密切相关。采用GCTS RTX-4000高温高压动态岩石三轴仪对大理岩进行了单轴、三轴压缩试验,研究了围压效应对大理岩力学变形、破坏模式及能量演化规律。结果表明,围压增大导致大理岩在变形方面表现出“脆-延-塑”转化特征;在破坏形式方面由轴向劈裂破坏逐渐向斜剪拉裂破坏发展;在能量演化方面表现出总能量、弹性能和耗散能与围压具有正增长关系;在损伤方面,基于耗散能计算损伤变量,发现随围压的增加,大理岩损伤变量数值逐渐增大,二者表现出正相关关系,并且损伤变量与轴向应变呈四次多项式增长规律。The deformation and failure of rock under pressure is closely related to the evolution of energy.This study conducted the uniaxial and triaxial compression tests of marble by using GCTS RTX-4000 high-temperature,high-pressure dynamic rock triaxial apparatus,and studied the mechanical deformation,failure mode and energy evolution law of marble under the confining pressure effect.The results show that the marble deformation has"brittle-ductile-plastic"transformation characteristics as the increase of confining pressure;the failure features a gradual development from axial splitting failure to oblique shear tensile failure;energy evolution features a positive growth relationship between the total energy,elastic energy and dissipation energy and the confining pressure;as for the damage,it is found that,based on the calculated damage variable,the value of marble damage variable gradually increases with the confining pressure,there is a positive correlation between the two variables;and the damage variable and the axial stress have a law of standard quartic polynomial increase.

关 键 词：深部大理岩 围压效应 变形特性 能量演化 损伤变量 

分 类 号：TU45[建筑科学—岩土工程]