岩土力学Issue(8)：2241-2246,2254,7.
冻融作用下冻结黄土黏聚力长期强度变化规律
Changing rule of long-term strength of frozen loess cohesion under impact of freeze-thaw cycle
摘要
Abstract
Taking Shaanxi Fuping remolded loess as the object of study, soil samples gone through different numbers of freeze-thaw cycle under a closed system, and variations about mechanical index (cohesion) of soil at the different numbers of freeze-thaw cycle are analyzed. Experiment used spherical template into the determination of relative instantaneous strength and long-term strength of frozen loess. After 4 times, the relative instantaneous strength is the largest, but greatly reduces after 6 times. The relative instantaneous strength significantly increases at the eighth time (but less than the forth time), and gradually becomes stable after 10 times. The largest long-term strength of frozen loess is at the eighth time. The long-term strength at the 6th time and 10th time is similar in the middle level. The lowest relative instantaneous strength is at the 4 th, 50 th and 100 th time. Void ratio and density changes are corresponding to relative instantaneous strength. This kind of change rule has the close relationship with moisture migration in the process of freeze-thaw. The relationship between long-term strength and physical properties is not obvious. It is a synthetical reflection of the internal structure, mineral composition and physical properties.关键词
冻融循环/黏聚力/相对瞬时强度/长期强度Key words
freeze-thaw cycle/cohesion/relative instantaneous strength/long-term strength分类
建筑与水利引用本文复制引用
周泓,张豫川,张泽,冯文杰,周波,武俊杰..冻融作用下冻结黄土黏聚力长期强度变化规律[J].岩土力学,2014,(8):2241-2246,2254,7.基金项目
国家自然科学基金项目（No.41301070）；中科院西部之光博士项目；教育部留学回国人员科研启动基金项目（第46批）；青海省电力设计院自主立项课题（No.63-K2012-02）。 （）
