云桂铁路弱—中膨胀土膨胀力试验研究  

In-situ testing studies of swelling pressure on weak-medium expansive soil of Yun Gui Railway

作　　者：王亮亮[1] 杨果林[1] 刘黄伟[1] 徐亚斌[1] 汪鹏福[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2013年第11期4658-4663,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51278499);铁道部科技研究开发计划项目(2010G016-B);湖南省研究生科研创新项目(CX2012B062)

摘　　要：为了满足云桂铁路典型弱—中膨胀土路段边坡支挡结构设计的要求,利用平衡加压法进行膨胀力现场试验,研究膨胀力随时间、含水率增量、卸荷回弹量的变化规律,并对膨胀力现场试验方法进行探讨。研究结果表明:竖向膨胀力随时间和含水率增量的变化规律基本相似,呈缓变型,可划分为4个阶段,即初始快速膨胀阶段、过渡阶段、二次线性增长阶段和稳定阶段;饱和膨胀土的卸荷回弹变形量与膨胀力呈线性负相关性;本试验方法原理简单,试验结果能够真实反映现场膨胀力及其发展规律。In order to meet the design requirements of expansive soil slope supporting and retaining structure of Yun-Gui Railway, in-situ swelling pressure test studies were undertaken using swelling pressure balance method. The variation law of vertical swelling pressure associated with time, increment in water content and unloading resilience amount change were researched, and rationality of the testing method was discussed. The results show that the relationship among vertical swelling pressure and immersion time and increment in water content can be divide into four phases, i.e. initial rapidly swelling, gradual transition, second time linearly increase and stable stage. Unloading resilience amount increases as linear model with the decrease of the vertical swelling pressure. The theory of the testing method is simple.

关 键 词：膨胀土 膨胀力 含水率增量 卸荷回弹变形 

分 类 号：TU443[建筑科学—岩土工程]