Study on the Effect of Drying and Wetting Cycles on the Crack Evolution and Strength of Expansive Mudstone
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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。Abstract: 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.
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Key words:
- expansive mudstone /
- drying and wetting cycles /
- strength /
- fracture
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表 1 岩样基本物理力学性质指标
干密度/
（g·cm−3）含水率/% 比重 孔隙比 自由
膨胀率
/%抗压强度
/MPa耐崩
解指
数/%1.62～1.69 18.6～24 2.59 0.53～0.6 51 1.1 1.2 
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