干湿循环对膨胀性泥岩裂隙和强度的影响研究  

Study on the Effect of Drying and Wetting Cycles on the Crack Evolution and Strength of Expansive Mudstone

作　　者：宋磊 张荣宽 汤勇 Song Lei;Zhang Rongkuan;Tang Yong(China Design Group Co.,Ltd.,Nanjing 210029,Jiangsu,China;Jiangsu Yuheng Engineering Quality Inspection Co.,Ltd.,Yancheng 224014,Jiangsu,China)

机构地区：[1]华设设计集团股份有限公司,江苏南京210029 [2]江苏禹衡工程质量检测有限公司,江苏盐城224014

出　　处：《岩土工程技术》2023年第5期614-617,共4页Geotechnical Engineering Technique

摘　　要：通过对合肥地区某水利工程场地膨胀性泥岩的原状样进行室内干湿循环试验,分析不同干湿循环次数下的膨胀性泥岩的裂隙图像,对不同干湿循环次数下的试样进行直剪试验,得出膨胀性泥岩在限制浸水膨胀变形的条件下,随干湿循环次数的增加,黏聚力和内摩擦角的减小速率变缓,裂隙度逐渐增加,裂隙长度和裂隙总面积增加。研究成果对该类膨胀性泥岩地区工程建设具有指导意义。Based on the indoor drying and wetting cycles test of the undisturbed expansive mudstone in a water conservancy project in Hefei area,the crack images of expansive mudstone under different times of drying and wetting cycles were analyzed,and the direct shear test was carried out.The results show that the cohesion and internal friction angle of expansive mudstone decrease with the increasing number of drying and wetting cycles time,and the fracture length and total fracture area increase with the increasing number of drying and wetting cycles under the condition of limited water swelling deformation.The research results have guiding significance for engineering construction in this kind of expansive mudstone area.

关 键 词：膨胀性泥岩 干湿循环 强度 裂隙 

分 类 号：TU411[建筑科学—岩土工程]