降雨-蒸发循环作用下柔性支护处治膨胀土边坡的渗流及稳定性研究  

A Study on Seepage and Stability of Expansive Soil Slope Treated with Flexible Support Under Rainfall-Evaporation Cycle

作　　者：常锦 郭剑雄 张海娜 赵世龙 张红日 CHANG Jin;GUO Jianxiong;ZHANG Haina;ZHAO Shilong;ZHANG Hongri(Key Laboratory of Road Structure and Materials Transportation Industry(Changsha),Changsha University of Science and Technology,Changsha Hunan 410114,China;School of Civil Engineering,Changsha University,Changsha Hunan 410022,China;China Communications Fourth Navigation Engineering Research Institute Co.,Ltd.,Guangzhou Guangdong 510230,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang Jiangxi 330013,China;School of Traffic and Transportation Engineering,Changsha University of Science and Technology,Changsha Hunan 410114,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning Guangxi 530007,China)

机构地区：[1]长沙理工大学道路结构与材料交通行业重点实验室(长沙),湖南长沙410114 [2]长沙学院土木工程学院,湖南长沙410022 [3]中交四航工程研究院有限公司,广东广州510230 [4]华东交通大学土木建筑学院,江西南昌330013 [5]长沙理工大学交通运输工程学院,湖南长沙410114 [6]广西交科集团有限公司,广西南宁530007

出　　处：《长沙大学学报》2024年第5期1-8,共8页Journal of Changsha University

基　　金：广西重点研发计划“膨胀土灾变力学特性及防控技术标准化研究”(AB23075184);交通部2022年度交通运输行业重点科技项目清单“膨胀土工程边坡灾变柔性生态护坡综合关键技术研究”(2022-MS5-125);长沙理工大学道路结构与材料交通行业重点实验室开放基金资助项目“地震作用下反倾岩质边坡块状-弯曲复合倾倒动力破坏机理研究”(kfj220302);长沙理工大学道路结构与材料交通行业重点实验室开放基金资助项目“酸雨环境与干湿循环作用下膨胀土胀缩变形的力学-化学机制研究”(kfj220301)。

摘　　要：为探究土工格栅柔性支护处治膨胀土边坡的机理,基于广西百色地区的气候数据资料,运用Plaxis有限元软件分析了实际大气降雨-蒸发循环作用下柔性支护处治膨胀土边坡的温度、渗流变化及边坡稳定性。结果表明:边坡土体温度变化随着深度的增加而减小,在浅层温度变化最显著,最后逐渐趋于平缓。温度场的影响范围远大于渗流场,温度的改变很难对碎石层后部土体造成影响,深部土体温度在降雨-蒸发循环下仍保持稳定,土体中基质吸力、边坡安全系数与天气条件之间变化规律一致。柔性支护结构的存在能有效阻挡雨水渗入膨胀土边坡,保持膨胀土边坡含水率的长期稳定,有效阻隔蒸发蒸腾作用对膨胀土边坡的影响,维持了膨胀土体较高的抗剪强度,起到防渗保湿效果。To explore the mechanism of using geogrid flexible support to treat expansive soil slopes,based on climate data from the Baise area of Guangxi,Plaxis finite element software is used to analyze the temperature,seepage changes,and slope stability of flexible support based on evaporation cycles as an example.The results show that the temperature change of the slope soil decreases with increasing depth,with the most significant temperature change occurring in the shallow layer,and gradually tends to flatten out.The influence range of temperature field is much larger than that of seepage field,and temperature changes are difficult to affect the soil behind the gravel layer.The temperature of deep soil remains stable under rainfall-evaporation cycles.The variation law of matrix suction and slope safety factor in the soil is consistent with the weather conditions.The existence of flexible support structure can effectively prevent rainwater from infiltrating into expansive soil slope,maintain long-term stability of expansive soil slope moisture content,effectively block the effect of evapotranspiration on expansive soil slope,maintain high shear strength of expansive soil,and achieve a seepage prevention and moisture effect.

关 键 词：路基工程 降雨 蒸发 膨胀土边坡 柔性支护 渗流 边坡稳定性 

分 类 号：U416.167[交通运输工程—道路与铁道工程]