Laboratory characterization of rainfall-induced loess slope failure

被引:187
|
作者
Wu, L. Z. [1 ]
Zhou, Y. [1 ]
Sun, P. [2 ,3 ]
Shi, J. S. [4 ]
Liu, G. G. [1 ]
Bai, L. Y. [1 ]
机构
[1] Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Sichuan, Peoples R China
[2] Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China
[3] Minist Land & Resources, Key Lab Neotecton Movement & Geohazard, Beijing 100081, Peoples R China
[4] MLR, China Geol Survey, Beijing 100037, Peoples R China
关键词
Loess; Rainfall infiltration; Landslide; Flume experiment; PORE-PRESSURE GENERATION; LANDSLIDE; FLUIDIZATION; PLATFORM; BAOJI; MODEL;
D O I
10.1016/j.catena.2016.11.002
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Loess slopes are widely distributed throughout the northwestern region of China and are prone to slope failure in response to heavy rainfall. We undertook three groups of flume experiments in the laboratory to study loess slope dynamics under artificial rainfall conditions. Additionally, a laser scanner was used to observe loess landslide deformation characteristics and failure development. A numerical analysis of unsaturated seepage in loess slopes because of rainfall infiltration was performed. Moisture content, pore-water pressure, and slope deformation were monitored to quantify the relationship between rainfall infiltration and loess slope stability. Movement of the wetting front near the slope surface was triggered by rainfall and related to rainfall intensity and duration, which is consistent with the numerical solution. Rainfall infiltration increased pore-water pressure, producing gravity-driven landslides. We observed that landslide development began with local failure in the toe slope that gradually retreated toward the crown, forming a multi-sliding displacement, and eventually resulting in total slope failure. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:1 / 8
页数:8
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