摘要
为了探讨所研究的膨胀土(岩)在干湿循环条件下胀缩效应的规律性,以及不同时代、不同岩性的土体抗剪强度在反复胀缩条件下的变化,在南水北调中线一期工程陶岔-沙河南段进行了反复胀缩试验。分别选取膨胀土(岩)各两个典型段的原状样进行了1次不干缩-无荷膨胀试验和4次干缩-饱水膨胀试验。通过统计分析得出:在反复胀缩条件下,强膨胀土(岩)的c值与φ值均是在最初干缩-饱水膨胀初期出现明显的陡降段,但至后期趋于稳定;强膨胀岩抗剪强度的衰减程度要比强膨胀土的小一些。
In order to explore the regularity of shrink-expansion effect of expansive soil （rock） under the dry-wet circulation condition, the cyclic shrink-expansion tests were conducted in the Taocha -Shahe section of Middle Route Project of South-to-North Water Diversion and the reaction of shear strength of soil with different ages and lithologies under cyclic shrink-expan-sion were studied. One unshrinking-unloading expansion test and four shrinking-saturating expansion tests were done for un-disturbed samples collected at two typical sections. It can be concluded that the c and φ values of strong expansive soil （rock） fall sharply and obviously at the initial stage of shrinking-saturating tests, but tends to be stable at later period under cyclic shrink-expansion. Meanwhile, the shear strength attenuation of strong expansion rock is smaller than that of strong expansive soil.
出处
《人民长江》
北大核心
2014年第6期63-66,共4页
Yangtze River
基金
国家"十二五"科技支撑计划项目"强膨胀土(岩)渠道处理技术"(2011BAB10B02)
关键词
强膨胀土(岩)
抗剪强度
反复胀缩
南水北调中线一期工程
strong expansive soil （rock）
shear strength
cyclic shrink - swell
stage I of Middle Route Project of South - to- North Water Diversion
