考虑不同加载条件的粉砂质泥岩损伤特征  

Damage characteristic of silty mudstone under various loading condition

作　　者：张向东[1] 曲直 李军[1] ZHANG Xiangdong;QU Zhi;LI Jun(Institute of Civil Engineering and Transportation,Liaoning Technical University, Fuxin, Liaoning 123000, China)

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《中国地质灾害与防治学报》2018年第3期120-126,共7页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金委员会-神华集团有限公司煤炭联合基金(51174268);高等学校博士学科点专项科研基金(201121211110004)

摘　　要：为了研究粉砂质泥岩硐室开挖过程中围岩的损伤特性,该文提出了一个考虑损伤特性的粉砂质泥岩的加载损伤模型。采用三轴压缩试验,得出不同围压、不同加载速率下粉砂质泥岩的应力应变曲线,并与粉砂质泥岩的加载损伤模型相结合得到了粉砂质泥岩在加载过程中的损伤规律。为探究模型的可靠性,根据超声波在发生损伤材料的传导速度衰减特征,利用TICO混凝土超声波测试仪对加载过程中的试件进行超声检测,得到了粉砂质泥岩不同加载阶段的损伤变化规律。结果表明,所提出的的粉砂质泥岩加载损伤模型可以反映粉砂质泥岩的损伤演化规律。In order to study the surrounding rock damage characteristics of underground chamber during excavation in silty mudstone,this paper proposed a damage model considering damage characteristics of silty mudstone under various loading. the stress-strain curves of silty mudstone under different loading rate and different confining pressure are obtained through three axial compression test,the damage law of silty mudstone in the loading process was obtained considering the loading and damage model of silty mudstone. In order to explore the reliability of the model,the loading process of the specimens were detected by TICO ultrasonic concrete tester,the damage law of silty mudstone under different loading stage was obtained. The result show that the proposed damage model can reflect the damage evolution of silty mudstone.

关 键 词：粉砂质泥岩 三轴压缩试验 损伤演化模型 超声检测 

分 类 号：TU457[建筑科学—岩土工程]