岩土工程学报2016，Vol.38Issue(z2)：198-203,6.DOI:10.11779/CJGE2016S2032
冻结改良黄土三轴强度和变形特性试验研究
Experimental study on triaxial strength and deformation characteristics of frozen-improved loess
摘要
Abstract
In order to study the deformation and triaxial strength behaviors of frozen loess and frozen-improved loess, a series of triaxial compression tests are conducted under confining pressure varying from 1 to 15 MPa at −6 °C. The results show that the shape of stress-strain curves presents strain softening and strain hardening successively. Both the initial tangent modulus and the volumetric strain increase at first then decrease with the increase of confining pressure. The triaxial strength of frozen loess and frozen-improved loess increases at first then decreases with the increase of confining pressure. The strength of frozen loess is enhanced after being improved, and the improvement effect of cement is more significant. Based on the Mohr-Coulomb criterion, the variation laws of generalized cohesion and internal friction angle with confining pressures of frozen loess and frozen-improved loess are obtained. Meanwhile, a nonlinear Mohr-Coulomb strength criterion for frozen loess and frozen-improved loess is proposed, which reflects the phenomenon that the triaxial strength changes nonlinearly with the increase of the confining pressure.关键词
冻结黄土/冻结改良黄土/变形规律/强度特性/试验研究Key words
frozen loess/frozen-improved loess/deformation law/strength characteristic/experimental study分类
建筑与水利引用本文复制引用
牛亚强,王旭,廖孟柯,蒋代军,刘德仁..冻结改良黄土三轴强度和变形特性试验研究[J].岩土工程学报,2016,38(z2):198-203,6.基金项目
国家重点基础研究发展计划（“973”计划）项目（2012CB026102）；国家自然科学基金重点资助项目（41230630）；国家自然科学基金项目（51268033）；中国中铁重点课题（302566）；长江学者和创新团队发展计划滚动资助（IRT_15R29）” （）
