膨胀土边坡土工膜防护方案试验研究  

Experimental study on geo-membrane protection scheme for expansive soil slope

作　　者：袁俊平[1,2] 韩春雷[1,2] 丁巍[1,2] 王强林[1,2] 卢艳平[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程研究所,江苏南京210098

出　　处：《河北工程大学学报（自然科学版）》2015年第4期6-10,共5页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(51378008);"十二五"国家科技支撑计划项目(2011BAB10B04);中央高校基本科研业务费专项资金资助项目(B15020060)

摘　　要：为了进一步研究采用土工膜防护方案的膨胀土边坡在降雨和蒸发过程中水分分布规律，验证土工膜防护方案的可行性，进行土工膜防护方案的室内模型槽试验，在人工条件下对膨胀土边坡进行降雨和蒸发的若干次循环，并测量试验过程中模型边坡不同深度含水率的变化。结果表明：土工膜在降雨过程中阻碍了雨水入渗膜下土体，使得膜下土体保持较低含水率，在土水特征曲线上对应较高吸力，这将使土的有效应力增加，增强了边坡的稳定性；坡顶土工膜覆盖在7～10m范围时。边坡边缘及其下部土体能够不受雨水入渗和蒸发的干扰，始终保持较高吸力状态。In order to further study the water distribution of expansive soil slope protected by geo - membrane protection scheme during rainfall and evaporation, and verify the feasibility of geo - membrane protection scheme, laboratory model test for geo - membrane protection program is conducted. Make the expansive soil slope model go through the cycle of artificial rainfall and evaporation, in which volumetric water content probes are buried at different depths, so that the moisture content at different depths in the slope model can be measured at any time. The results show that the geo - membrane impede rainwater infiltrating into soil under the geo -membrane during wet and dry cycle, which make the soil under geo - membrane maintain a lower moisture content corresponding with a higher suction in the soil water characteristic curve. This will increase the effective stress of the soil and the stability of the slope. In this paper, to discuss the coverage of the geo - membrane at the back of the slope, the VADOSE/W module in the finite element software GeoStudio is used to simulate an expansive soil subjected to rainfall and evaporation cycle in the natural. By comparing the volume moisture content and suction in slopes of different coverage, it states that when the coverage of geo - membrane at the back of the slope is between 7 and 10 meters, soil under the geo - membrane at the edge of the slope won＇t be interfered with rainfall and evaporation and maintains a high suction state.

关 键 词：膨胀土边坡 土工膜 干湿循环 模型槽试验 

分 类 号：TU443[建筑科学—岩土工程]