工程地质学报2017，Vol.25Issue(4)：1094-1104,11.DOI:10.13544/j.cnki.jeg.2017.04.024
降雨诱发黄土高填方支挡边坡失稳机理研究
RAINFALL INDUCED INSTABILITY MECHANISM OF HIGH EMBANKMENT RETAINING LOESS SLOPE
摘要
Abstract
In recent years,the constructions of airport,highway and railway transportation network and urbanization in the loess hilly areas have been carried out more and more frequent.They have formed a large quantities of high loess embankment slope.Although the annual rainfall of these areas is semiarid,rainfall is the main factor for the failure of loess slopes.This paper analyses the in-situ seepage experiment and the transient unsaturated seepage under the conditions considering the fractures and the mechanical properties of saturated loess.It examines the failure mechanism of high fill retaining loess slope.The results show the following.(1) The maximum infiltration depth of the test pit center is 1.30m after 3 days in the in situ seepage experiment.The maximum depth of the wetting front is 0.20m below the maximum infiltration depth.(2) When the confining pressure is less than 300kPa,the axial strain of the saturated soil increases to about 20％,and reaches the steady state.Under the condition that static driving shearing stress is larger than the steady shear strength,the local flowslide failure of the high fill slope can occur.(3) In general,the formation mechanism of deformation and failure of the retaining high embankment slopes is as follows:push creeping-retaining structural failure-progressive slip shear-traction collapse.关键词
降雨入渗/黄土/高填方边坡/失稳机理Key words
Rainfall infiltration/Loess/High fill slope/Failure mechanism分类
天文与地球科学引用本文复制引用
张硕,裴向军,黄润秋,谭淋耘,范珊,张子东,崔雪婷..降雨诱发黄土高填方支挡边坡失稳机理研究[J].工程地质学报,2017,25(4):1094-1104,11.基金项目
国家重点基础研究发展计划项目(2014CB744703)资助. （2014CB744703）
