| 不同渗流边界条件下粉砂边坡失稳模型试验研究 |
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| 引用本文： | 包小华,廖志广,徐长节,庞小朝,谢雄耀,崔宏志.不同渗流边界条件下粉砂边坡失稳模型试验研究[J].岩土力学,2019,40(10):3789-3796. |
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| 作者姓名： | 包小华 廖志广 徐长节 庞小朝 谢雄耀 崔宏志 |
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| 作者单位： | 1. 深圳大学 土木与交通工程学院，广东 深圳 518060；2. 华东交通大学 土木建筑学院，江西 南昌 330013；
3. 中国铁道科学研究院 深圳研究设计院，广东 深圳 518000；4. 同济大学 地下建筑与工程系，上海 200092 |
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| 基金项目： | 深圳市科技创新计划项目(No. JCYJ20170302143610976)。 |
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| 摘 要： | 研究不同渗流边界条件下粉砂边坡的稳定特性对滑坡安全评价及防灾减灾具有重要意义。开发研制了室内边坡模型试验系统，分别进行了在上部边界入渗、侧向边界入渗和底部边界入渗的边坡失稳模型试验。分析了各试验中边坡内部不同位置体积含水率、孔隙水压力和基质吸力的变化规律以及坡体破坏过程。结果表明，不同入渗边界条件下边坡土体局部由非饱和变为饱和状态，基质吸力消失，最后在坡面形成不稳定区域塌落破坏。上部边界入渗、侧向边界入渗和底部边界入渗所引起的破坏模式根据其特点可分为局部浅层破坏、多级后退式破坏和坡面滑动破坏。通过监测边坡不同位置的体积含水率，可以为渗流引发的边坡失稳预警机制提供参考依据。
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| 关 键 词： | 模型试验 边坡失稳 渗流边界 非饱和粉砂 基质吸力 |
| 收稿时间： | 2019-01-28 |
Model test study of the failure of silty sand slope under different seepage boundary conditions |
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| BAO Xiao-hua,LIAO Zhi-guang,XU Chang-jie,PANG Xiao-chao,XIE Xiong-yao,CUI Hong-zhi.Model test study of the failure of silty sand slope under different seepage boundary conditions[J].Rock and Soil Mechanics,2019,40(10):3789-3796. |
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| Authors: | BAO Xiao-hua LIAO Zhi-guang XU Chang-jie PANG Xiao-chao XIE Xiong-yao CUI Hong-zhi |
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| Institution: | 1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China; 2. School of Civil Engineering & Architecture, East China Jiaotong University, Nanchang, Jiangxi 330013, China; 3. Shenzhen Research and Design Institute of China Academy of Railway Sciences, Shenzhen, Guangdong 518000, China; 4. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | Studying the stability characteristics of silt sand slope under different seepage boundary conditions is of great significance to safety evaluation and disaster prevention of slope failure. An indoor slope model test system was developed. The model tests of slope instability under upper boundary infiltration, lateral boundary infiltration and bottom boundary infiltration were carried out respectively. The time histories of volumetric water content, pore water pressure, matrix suction at different positions inside the slope and failure process of the slope were analyzed and discussed. The results showed that soil changed from unsaturated state to saturated state in local place of the slope, the matric suction disappeared, and finally unstable regions and destruction formed on the slope surface under different seepage boundary conditions. Failure modes caused by upper boundary infiltration, lateral boundary infiltration and bottom boundary infiltration can be described as local shallow failure, multi-level retrogressive failure, and surface slide failure, respectively. By monitoring the volumetric water contents at different positions of the slope, an early warning system for slope instability caused by seepage can be proposed. |
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| Keywords: | model test slope failure seepage boundary unsaturated silty sand matric suction |
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