膨胀土侧向膨胀力原位试验研究  

An in-situ experimental research of lateral swelling pressure on expansive soils

作　　者：杨果林[1] 滕珂[1] 秦朝辉[2] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《中南大学学报（自然科学版）》2014年第7期2326-2332,共7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)

摘　　要：针对支挡结构后膨胀力的实际情况,采用平衡加压法,设计一种侧向膨胀力的测试方法,通过该方法测得广西百色地区膨胀土在无上部荷载条件下的侧向膨胀力,并结合试验前后含水率变化及试验加水量,得到膨胀力与含水率关系经验公式。由于原位土样的特性原位试验结果与室内模型试验结果有一定差异,侧向膨胀力沿深度呈梯形分布。研究结果表明:侧向膨胀力约为竖向膨胀力的25%;现场膨胀力实测结果接近侧向膨胀力测试结果,表明采用本文方法可反映膨胀土对支挡结构的膨胀力的真实情况,能为支挡结构设计提供参考。In order to test expansion force of the retaining structure, a balanced pressure method was designed to measure lateral swelling force of Guangxi expansive soil under the condition of ultimate load in Baise region, Guangxi. Combined with the water moisture content changes before and after the experiment, an empirical formula of relationship between swelling pressure and moisture content was gained. Because there is difference between the nature results of in-situ soil sample and the indoor model test results, the lateral expansion force along the depth exhibits the trapezoidal distribution. The results show that the lateral expansion force is about 25% of the vertical expansion force. The expansion forces are close to the lateral forces, which shows that the swelling pressure can reflect the real situations.

关 键 词：膨胀土 侧向膨胀力 原位测试 含水率 

分 类 号：TU413.1[建筑科学—岩土工程]