台塬塬顶裂缝对黄土斜坡水文响应的影响

J4 ›› 2011, Vol. 41 ›› Issue (5): 1512-1519.

台塬塬顶裂缝对黄土斜坡水文响应的影响

武彩霞¹|戴福初¹|闵弘², 涂新斌¹|邝国麟³|周跃峰³

1.中国科学院地质与地球物理研究所, 北京100029;
2.中国科学院岩土力学研究所|武汉430071;
3.香港大学土木工程学系|香港999077

收稿日期:2010-12-23 出版日期:2011-09-26 发布日期:2011-09-26
作者简介:武彩霞(1982-)|女|山西汾阳人|博士研究生|主要从事黄土滑坡等地质灾害方面的研究|E-mail:wucaixia1024@126.com
基金资助:
香港研究资助局项目（RGC 7140/08E）

Influence of Cracks at the Platform on Hydrologic Response of Loess Slope

WU Cai-xia¹,DAI Fu-chu¹,MIN Hong²,TU Xin-bin¹,Kwong, A.K.L.³,ZHOU Yue-feng³

1.Institute of Geology and Geopysics,Chinese Academy of Sciences, Beijing100029, China;
2.Institute of Rock and Soil Mechanics|Chinese Academy of Sciences, Wuhan430071, China;
3.Department of Civil Engineering,University of Hong Kong, Hong Kong999077,China

Received:2010-12-23 Online:2011-09-26 Published:2011-09-26

摘要/Abstract

摘要：

针对黑方台黄土滑坡，从现场灌溉试验监测数据和数值模拟分析着手，研究灌溉过程中台塬斜坡的水文响应以及对黄土斜坡稳定性的影响。结果表明：短期的灌溉并不能对地下水位形成有效的补给，但是却容易引起斜坡浅部范围内体积含水量增加，从而使得抗剪强度降低，最终在台缘顶部发生滑塌，台塬顶部裂缝的存在会使得浅部体积含水量增加速度加快，加速土体弱化，更易发生台塬顶部的滑塌；从长期灌溉模拟来看，裂缝的存在会加速地下水位的上升。从数据上论证了黄土斜坡受裂缝的影响特性，为研究黄土滑坡与地表水入渗的关系提供数据参考。此外，数值模拟与监测数据有很好的对应关系，用其模拟灌溉引起的斜坡水文响应是可行的。

关键词: 黄土滑坡, 台塬裂缝, 灌溉水入渗, 现场监测, 数值分析

Abstract:

A field irrigation experiment has been made in an instrumented loess landslide of Heifangtai. Hydrological response and its effect on loess slope are analyzed based on monitoring data and numerical modelling. The result indicates that the groundwater table cannot be enhanced by short-term irrigation. However, the volumetric water content at shallow depths of the slopes increased rapidly, reducing the shear strength of loess and resulting in shallow failure at the margin of the platform. The cracks at the margin of the platform could increase the rate of infiltration. Numerical modeling of longterm irrigation indicates that cracks are favorable for rise of groundwater table. It is justified from the data the significance of loess slope affected by cracks. In addition, the numerical modeling results are consistent with the monitoring data, showing the numerical method can be used to simulate the hydrological response of the monitored site caused by irrigation.

Key words: loess landslide, cracks at the margin of platform, infiltration of irrigation, field monitoring, numerical analysis

中图分类号:

P641.1

武彩霞, 戴福初, 闵弘, 涂新斌, 邝国麟, 周跃峰. 台塬塬顶裂缝对黄土斜坡水文响应的影响[J]. J4, 2011, 41(5): 1512-1519.

WU Cai-xia, DAI Fu-chu, MIN Hong, TU Xin-bin, Kwong,A.K.L., ZHOU Yue-feng. Influence of Cracks at the Platform on Hydrologic Response of Loess Slope[J]. J4, 2011, 41(5): 1512-1519.

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