膨胀土路堑边坡格栅加筋层水力-力学响应的现场监测与数值模拟

韩仲; 谢云涛; 邹维列; 王协群; 肖杰; 张红日

doi:10.11779/CJGE20240306

膨胀土路堑边坡格栅加筋层水力-力学响应的现场监测与数值模拟 English Version

1.
武汉大学, 土木建筑工程学院, 武汉, 430072, 中国
2.
武汉理工大学, 土木工程与建筑学院, 武汉, 430070, 中国
3.
长沙理工大学, 交通运输工程学院, 长沙, 410114, 中国
4.
广西交科集团有限公司, 南宁, 530007, 中国

基金项目: 国家自然科学基金面上项目(52179109);国家自然科学基金面上项目(52078400);国家自然科学基金面上项目(52378365);湖北省重点研发计划项目(2023BCB112);广西重点研发计划项目(AB23075184);

计量
- 文章访问数: 0
- HTML全文浏览量: 0
- PDF下载量: 0
出版历程
- 收稿日期: 2024-04-05
- 网络出版日期: 2024-10-14

Hydromechanical Responses of Geogrid-Reinforced Expansive Soil Cutting Slopes: Field Monitoring and Numerical Simulation

摘要

摘要: 土工格栅加筋层稳固膨胀土坡技术是一种“覆盖”类加固方法，主要目的在于解决膨胀土边坡浅层滑动问题。该技术近年来在我国膨胀土地区得到了广泛应用。但加筋层在长期大气干湿循环作用下的水力-力学响应及其加固效果的演化规律有待进一步厘清。本文依托广西崇左-爱店公路一段采用该技术的膨胀土路堑边坡开展了三年的现场监测，分析了加筋层中膨胀土的含水率和水平土压力以及格栅的拉应变的分布和发展规律。通过数值模拟方法进一步研究了降雨入渗条件下该堑坡的水力-力学响应及其稳定性。监测及模拟结果表明：（1）加筋层能够有效隔离大气干湿循环的影响，使下伏膨胀土中含水率保持稳定，起到了保湿作用；（2）干湿循环作用下，格栅的最大拉应变出现在加筋层的中部，加筋层膨胀土中水平土压力随距坡面距离的增加而增大；（3）格栅通过对膨胀土的加筋及包裹作用，提高了加筋层的整体性和抗剪强度，限制了膨胀土的膨胀变形。因此，即使膨胀土在干湿循环作用下强度显著降低并在不加筋时产生失稳，但由于格栅的加筋作用，加筋层仍能够维持边坡稳定。
- 格栅加筋膨胀土；膨胀土路堑边坡；干湿循环；现场监测；数值模拟
Abstract: The technique of using geogrid-reinforced expansive soil as cover layer to protect expansive soil slopes belongs to the “covering” category in expansive soil reinforcing techniques and is mainly used for preventing shallow failure of expansive soil slopes. This technique has been widely used in expansive soil regions in China in recent years. However, the hydromechanical responses of the geogrid-reinforced layer deserves further investigation. This paper presents a case study on an expansive soil slope reinforced using this technique at the Chongzuo-Aidian Road. The distribution and evolution of the moisture content and horizontal earth pressure of the expansive soil and the tensile strain of the geogrids within the reinforced layer were monitored for three years for analyses. Based on this, numerical simulation studies were conducted to model the slope in the case study and further investigate the hydromechanical responses and stability of the slope upon infiltration. The results demonstrate that (i) the reinforced layer is effective in isolating the influences of external wetting and drying impacts and keep the moisture content stable in the underlying natural expansive soils. It has the function of humidity maintenance; (ii) upon drying-wetting cycles, the maximum strain of the geogrids is at the middle of the reinforced layer, and the horizontal earth pressure in the reinforced expansive soil increases with the distance to the slope surface; (iii) through reinforcement and the wrapping of the expansive soil, the geogrids improve the integrity and shear resistance of the reinforced layer and restrain the swelling strain. Therefore, although expansive soils loss strength over drying-wetting and may cause shallow failure for unreinforced slopes, the reinforced cover layer remains stable.
- geogrid-reinforced expansive soil

HTML全文

参考文献(0)

施引文献(12)

期刊类型引用(7)

1.	刘志，杨阳. 黄原胶联合微生物加固改善混合砂蓄水特性试验研究. 土木与环境工程学报(中英文). 2025(03): 49-57 . 百度学术
2.	梁越，冉裕星，许彬，张鑫强，何慧汝. 细颗粒含量影响渗流侵蚀规律的细观机理研究. 岩土工程学报. 2025(05): 1099-1106 . 本站查看
3.	高霞，梅雯艳，吴强，崔祥龙. 球度和扁平度对含瓦斯水合物煤体宏细观力学性质影响研究. 中国安全生产科学技术. 2025(05): 86-94 . 百度学术
4.	蔡国庆，刁显锋，杨芮，王北辰，高帅，刘韬. 基于CFD-DEM的流-固耦合数值建模方法研究进展. 哈尔滨工业大学学报. 2024(01): 17-32 . 百度学术
5.	程建毅，郭晓军，李泳. 泥石流物源土体标度分布参数与粘聚力的关系. 山地学报. 2024(03): 401-410 . 百度学术
6.	孙增春，刘汉龙，肖杨. 砂-粉混合料的分数阶塑性本构模型. 岩土工程学报. 2024(08): 1596-1604 . 本站查看
7.	孙建强. 颗粒形状对黄土干密度与抗剪强度的影响. 黑龙江工程学院学报. 2024(06): 8-15+23 . 百度学术