高陡边坡滑坡体黄土的强度特性研究

›› 2011, Vol. 32 ›› Issue (7): 1939-1944.

高陡边坡滑坡体黄土的强度特性研究

廖红建^{1, 2}，李涛²，彭建兵¹

1. 长安大学西部矿产资源与地质工程教育部重点实验室，西安 710054；2. 西安交通大学土木工程系，西安 710049

收稿日期:2010-12-15 出版日期:2011-07-10 发布日期:2011-06-30
作者简介:廖红建，女，1962年生，博士，教授，博士生导师，主要从事岩土材料本构关系及边坡稳定性分析方面的研究
基金资助:
国家自然科学基金资助项目（No. 50979087）；西部矿产资源与地质工程教育部重点实验室开放基金资助项目（No. CHD2010JC143）

Study of strength characteristics of high and steep slope landslide mass loess

LIAO Hong-jian^{1, 2}，LI Tao²，PENG Jian-bing¹

1. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang’an University, Xi’an 710054, China; 2. Department of Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Received:2010-12-15 Online:2011-07-10 Published:2011-06-30

摘要/Abstract

摘要： 黄土台塬是黄土地区典型的地貌特征，塬边多为高陡边坡，极易发生崩塌和滑坡地质灾害。位于陕西境内泾河以南的黄土塬－泾阳南塬为典型的高陡黄土边坡，其崩塌、滑坡地质灾害频繁发生，自东南向西北的大小滑坡形成了延绵约30 km的滑坡群。对泾阳南塬滑坡群进行分析，以其中一规模较大的近年滑坡——东风滑坡为例进行了实地考察、现场测量，对滑坡体后缘和前缘的黄土进行了一系列的室内物理和力学性质试验。分析了高陡黄土边坡滑坡的发生过程和破坏机制，由颗粒分析和湿陷性试验得出滑坡体前后缘土体的湿陷液化特征。分析了不同含水率对强度参数的影响，并对比分析了原状黄土和重塑黄土的强度参数和结构性，验证了重塑饱和黄土的应力-应变关系和体应变-轴应变关系与邓肯-张模型符合较好，为高陡黄土边坡稳定性分析强度参数的合理选取提供了参考

关键词: 黄土塬, 边坡稳定性, 滑坡, 三轴试验, 强度参数

Abstract: Loess plateau is a typical topography in loess areas; high steep slopes at plateau edge cause frequent geologic hazards of collapses and landslides. One of them is the south Jingyang plateau which is located at the south of Jing river in Shaanxi province of China. From southeast to northwest, frequently collapses and landslides form a 30 kilometers landslide group. Dongfeng landslide which occurred in recent years is one of the major landslides of the landslide group. Process and mechanism of high steep landslides were analyzed by field trips, in-situ measurement and physical and mechanical laboratory tests which were carried out on soil samples taken from leading edge and trailing edge of the landslide mass of Dongfeng landslide. Through grain size analysis and collapsibility test obtained collapsibility and liquefaction of mass loess. The influence of water content on strength parameters was studied by direct shear tests and triaxial tests on leading edge and trailing edge of the landslide mass. The structural properties of loess were studied by comparison of undisturbed loess and remolded loess. The consistency between remolded saturated loess stress-strain curves, volumetric strain-axial strain curves and Duncan-Chang model were certified by triaxial consolidated drained tests. The results of shear strength and deformation parameters of the landslide mass loess will benefit the parameter choices in the stability analysis of high and steep loess slopes.

Key words: loess plateau, slope stability, landslide, triaxial test, strength parameters

中图分类号:

TU 443

廖红建，李涛，彭建兵. 高陡边坡滑坡体黄土的强度特性研究[J]. , 2011, 32(7): 1939-1944.

LIAO Hong-jian ，LI Tao ，PENG Jian-bing. Study of strength characteristics of high and steep slope landslide mass loess[J]. , 2011, 32(7): 1939-1944.

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