不同含水率断层宏微观破裂与强度折减损伤

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中文摘要：为探究深部地区断层花岗岩不同含水率的宏观与微观跨尺度性质,开展了轴压力学试验、扫描电镜(scanning electron microscope,SEM)试验和X射线衍射(X-ray diffraction,XRD)试验,分析其多尺度破裂与强度折减损伤关系.结果表明:无水状态下宏观以剪切破坏为主且破裂面平滑,而随着含水率提高,其破裂模式以张拉破坏为主,裂纹路径与主应力方向平行且整体松散;低含水率工况微观破裂为沿晶破裂,高含水率工况为沿晶破裂和穿晶破裂的复合型破坏;吸水中期峰值强度与弹性模量两指标衰减率为前期6倍,达到衰减幅度最大限并呈非线性指数下降,吸水后期两指标衰减率回弹至前期状态;劣化系数随含水率增长而降低,吸水前期水分子起润滑岩石内部矿物作用,中后期阶段水分子发生侵蚀软化导致强度大幅度折减.

外文标题：Macro and Micro Fractures and Strength Reduction Damage of Faults with Different Water Content

外文摘要：In order to explore the macroscopic and microscopic cross scale properties of granite with different water contents in deep areas,axial compression tests,scanning electron microscopy(SEM)tests,and X-ray diffraction(XRD)tests were conducted to ana-lyze the relationship between multi-scale fracture and strength reduction damage.The results show that in the anhydrous state,the mac-roscopic failure is mainly shear failure and the fracture surface is smooth,while the macroscopic failure with an increase in water con-tent is mainly tensile failure,and the crack path is parallel to the main stress direction and overall loose.The micro fracture under low water content condition is intergranular fracture,while the high water content condition is a composite failure of intergranular fracture and transgranular fracture.The attenuation rate of the peak strength and elastic modulus in the middle stage of water absorption is 6 times that in the early stage,reaching the maximum attenuation amplitude and showing a nonlinear exponential decrease.In the later stage of water absorption,the attenuation rate of the two indicators rebounds to the previous state.The deterioration coefficient decrea-ses with the increase of water content.In the early stage of water absorption,water molecules play a role in lubricating the internal min-erals of the rock,while in the later stage,water molecules undergo erosion and softening,leading to a significant reduction in strength.

外文关键词：

deep faultsgranitefracture patternsmicroscopic mechanismsstrength reduction

作者：

高涛、陈云娟、敬艺、刘建民、王津津、杨传成、宋润钊

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作者单位：

山东省地震局,济南 250014

山东省地震工程研究院,济南 250021

山东建筑大学土木工程学院,济南 250101

山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,济南 250101

山东大学齐鲁交通学院,济南 250002

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关键词：

深部断层花岗岩破裂模式微观机制强度折减

基金：

国家自然科学基金面上项目国家自然科学基金青年科学基金山东省矿山灾害预防控制省部共建国家重点实验室开放基金山东省地震局科研项目山东省地震局科研项目山东省地震局科研项目山东建筑大学博士基金

项目编号：

4217231051609130MDPC0909YB2304YW2304TD202303XNBS1704

出版年：

2024

DOI：

10.12404/j.issn.1671-1815.2304016

科学技术与工程

中国技术经济学会

科学技术与工程

CSTPCD北大核心

影响因子：0.338

ISSN：1671-1815

年,卷(期)：2024.24(9)

参考文献量22