饱和黄土滑坡形成中的侧压力作用——以甘肃黑方台为例

吴玮江; 宿星; 叶伟林; 魏万鸿; 杨涛; 冯乐涛

doi:10.11779/CJGE2018S1022

饱和黄土滑坡形成中的侧压力作用——以甘肃黑方台为例 English Version

吴玮江¹,
宿星^{1, 2},
叶伟林^{1, 2},
魏万鸿¹,
杨涛¹,
冯乐涛¹

1. 甘肃省科学院地质自然灾害防治研究所,甘肃兰州 730000;
2. 兰州大学资源环境学院西部环境教育部重点实验室,甘肃兰州 730000

基金项目: 国家自然科学基金项目（41362014）; 甘肃省科学院应用研发项目（2012JK-07）; 甘肃省科学院应用研发项目（2015JK-01）

详细信息

作者简介:
吴玮江(1963- ),男,研究员,主要从事工程地质与地质灾害防治研究。E-mail: wwj0408@163.com。

中图分类号: TU43
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出版历程
- 收稿日期: 2018-02-23
- 发布日期: 2018-08-24

Lateral pressure in formation of saturated loess landslide——Case study of Heifangtai, Gansu Province

1. Geological Hazards Prevention Institute, Gansu Academy of Sciences, Lanzhou 730000, China;
2. Research School of Arid Environment and Climate Change, Key Laboratory of Western China's Environmental Systems of Ministry of Education, Lanzhou University, Lanzhou 730000, China

摘要

摘要: 由于长期农业灌溉水的入渗,甘肃黑方台黄土台塬区自1984年以来已发生滑坡130余次,以黄土层内滑坡为主,占90%以上。其形成机理具有特殊性,灌溉水大量入渗在黄土层底部形成20余米厚的饱和软弱基座,除使该层土体抗剪强度降低外,也使抗压强度降低,变形能力增强,在上部土体自重作用下,使饱和黄土向斜坡外侧发生强烈塑流变形。同时,在斜坡后部饱和黄土层中产生较大的侧压力,水平作用于前部斜坡体,助推其变形破坏和高速启程滑动,也是区内饱和黄土滑坡形成的动力来源之一。现场不同深度的侧压力观测资料表明,黑方台黄土台塬区侧压力主要产生在23.5 m以下的饱和黄土层中,达30~230 kPa,随着深度的增加而增大,作用于滑坡体的水平推力可达2236 kN/m。以黑方台2015年发生的4·29罗家坡滑坡为例,按不考虑侧压力和考虑侧压力分别计算其稳定系数为1.12和0.94,可见滑坡后部饱和黄土层中产生的侧压力对其形成有重要作用。
- 黄土层内滑坡 /
- 形成机理 /
- 饱和黄土 /
- 侧压力 /
- 塑流变形
Abstract: Due to the long-term infiltration effect of agricultural irrigation water, more than 130 landslides have been found since 1984 in the Heifangtai loess tableland, Gansu Province. Among them, more than 90% of landslides can be classified into the homogeneous loess ones. The formation mechanism is unique. Generally, the irrigation water can permeate the loess body and gather at the bottom of loess layer to form a saturated weak base with more than 20 m in thickness. The corresponding shear strength and compressive strength of this base layer are reduced greatly, while the deformation capacity increases. Under the loading impact of overburden, the saturated loess base layer will exhibit the phenomenon of severe plastic deformation towards the outside of the slope. Moreover, the relatively large lateral pressure can be generated in the saturated loess area at the back of the landslide and horizontally act on the front slope to cause deformation damage, and then results in the high-speed slipping, which is another one of the power sources to induce the saturated loess landslide. The observated data from the in-situ investigation show that the lateral pressure of soils is mainly generated in the saturated loess layer below 23.5 m, and it can reach 30~230 kPa in Heifangtai loess terrace area. The horizontal thrust may increase with the growth of depth, and can even reach as high as 2236 kN/m. In the case of the Luojiapo landslide which occurred on 29^th, April, 2015, its the stability coefficient is 1.12 when the lateral pressure is not taken into account, while it is reduced to 0.94 due to the effect of lateral pressure. Therefore, it can be concluded that the lateral pressure generated in the saturated loess layer at the back of landslide plays an important role in the formation of saturated loess landslide.
- homogeneous loess landslide /
- formation mechanism /
- undefined /
- undefined /
- undefined

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参考文献(16)

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5.	杨校辉，陆发，郭楠，朱彦鹏，周帅康. 多级黄土高边坡稳定性计算及数值模拟分析. 岩土工程学报. 2022(S1): 172-177 . 本站查看
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7.	吴玮江，宿星，冯乐涛，王国亚. 甘肃黑方台滑坡类型与活动特征研究. 冰川冻土. 2019(06): 1483-1495 . 百度学术

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饱和黄土滑坡形成中的侧压力作用——以甘肃黑方台为例 English Version

作者简介: 吴玮江(1963- ),男,研究员,主要从事工程地质与地质灾害防治研究。E-mail: wwj0408@163.com。

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Lateral pressure in formation of saturated loess landslide——Case study of Heifangtai, Gansu Province

期刊类型引用(7)

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作者简介:
吴玮江(1963- ),男,研究员,主要从事工程地质与地质灾害防治研究。E-mail: wwj0408@163.com。