岩土工程学报2016，Vol.38Issue(7)：1291-1300,10.DOI:10.11779/CJGE201607017
干湿循环对泥质砂岩力学特性及其微细观结构影响研究
Influenceofwetting-drying cycles on mechanical properties and microstructure of shaly sandstone
摘要
Abstract
The shaly sandstone which is taken from a slope of the Three Gorges Reservoir isstudied. Considering different wetting-drying cycles, the mechanical properties of shaly sandstone areinvestigated through uniaxial andtriaxial compression tests. The microstructural change law of shaly sandstone is alsostudied using thescanningelectronmicroscopy. The research reveals that with the increasing wetting-drying cycles (1~20), the peak stress, elastic modulus, cohesion and internal friction angle of shaly sandstone decrease. But the peak strain showstwo stages offalling andstability. The microstructuralchange law of shaly sandstone can be summarized as three stages ofregular, porous and cracking properties. Byusingthe discrete element software PFC2D, the influences of wetting-drying cycles on contact network of shaly sandstone grains, distributionofchains and distribution ofcracks are studied. Based on the test results, the expression of Mohr-Coulomb strength theoryfor shaly sandstone is modified considering wetting-drying cycles.关键词
干湿循环/泥质砂岩/力学特性/微细观Key words
wetting-drying cycle/shaly sandstone/mechanical property/microstructure分类
建筑与水利引用本文复制引用
刘新荣,李栋梁,张梁,王震..干湿循环对泥质砂岩力学特性及其微细观结构影响研究[J].岩土工程学报,2016,38(7):1291-1300,10.基金项目
2015重庆市研究生科研创新项目（CYB15038）；国家自然科学基金项目 （）
