CAJ | 학술논문

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。
위료탐토소연구적팽창토(암)재간습순배조건하창축효응적규률성，이급불동시대、불동암성적토체항전강도재반복창축조건하적변화，재남수북조중선일기공정도차-사하남단진행료반복창축시험。분별선취팽창토(암)각량개전형단적원상양진행료1차불간축-무하팽창시험화4차간축-포수팽창시험。통과통계분석득출：재반복창축조건하，강팽창토(암)적c치여φ치균시재최초간축-포수팽창초기출현명현적두강단，단지후기추우은정；강팽창암항전강도적쇠감정도요비강팽창토적소일사。
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.