摘要
为研究冻融循环作用对土物理力学性质的影响,以青藏粘土为研究对象,通过对室内制备的粘土试样在经历0～21次完整冻融循环过程后,进行不同围压下三轴压缩试验,研究经多次冻融作用后,高度、试样含水量、应力–应变行为、破坏强度、弹性模量、抗剪强度指标等物理力学性质的变化。试验结果表明:冻融过程是使土体从不稳定态向动态稳定态的发展过程,反复的冻融循环改变了土体的性状,使得土体向新的动态稳定平衡状态发展。
A fine-grained clay was compacted in the laboratory and was thereafter exposed to a maximum of 21 closed-system freezing and thawing cycles. The sample height, water content, stress-strain behavior, failure strength, elastic modulus, cohesion and internal friction angle were measured in unfrozen soil as well as in thawed soil. The results show that the physio-mechanical characteristic of investigated soils changed after freezing and thawing. The height of studied sample increased and water content decreased before 7 freezing and thawing cycles and kept invariable after 7 freezing-thawing. The curves style of stress-strain behavior were not be affected by freeze-thaw process; but the elastic modulus and failure strength were heavily influenced by the number of freeze-thaw cycles. For the soil investigated, the cohesion decreased with increasing of the number of freeze-thaw cycles; and the internal friction angle ranged from 15° to 30°.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第23期4313-4319,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(40401013)
中国科学院西部之光人才培养计划资助项目
国家自然科学基金重大研究计划(90102006)
关键词
土力学
冻融循环
青藏粘土
三轴试验
破坏强度
soil mechanics
freeze-thaw cycle
Qinghai--Tibet clay
triaxial experiment
failure strength
