黄土斜(边)坡表层冻结效应及其稳定响应  

FREEZING EFFECT ON LOESS SLOPE AND ITS STABILITY RESPONSE

作　　者：王念秦[1] 罗东海[1] 

机构地区：[1]西安科技大学地质与环境学院,西安710054

出　　处：《工程地质学报》2010年第5期760-765,共6页Journal of Engineering Geology

基　　金：国家自然科学基金项目(40972174);教育部科学技术研究重点项目(208145);铁三院地路处科研(科研06-2)

摘　　要：中国黄土分布于季节性冻土区,年复一年的冻融作用对具有特殊结构黄土斜(边)坡的稳定性有很大影响,促发了大量黄土斜(边)坡灾害,制约着地区经济发展。深入研究冻融作用机理,对减轻黄土斜(边)坡灾害有重要的理论和现实意义。针对黄土斜(边)坡灾害及冻融作用特点,利用表层冻结温度场数值模拟、冻结前后地下水聚集模型分析及实例验证分析等方法、手段,揭示边坡表层土体冻结过程、坡体内地下水集聚过程,探讨黄土斜(边)坡表层冻结效应及其稳定响应。结果是:(1)表层冻结作用由表及里进行,大约在冻结3个月后达到当地最大冻深;(2)以简化的地下水聚集模型分析,推导得到坡体内地下水浸润线方程;(3)冻结滞水作用可使黄土斜(边)坡稳定性降低约25%。Loess in China is distributed in the seasonal frozen soil area.Effect of freezing-thawing has greatly influenced on the stability of loess slopes,which has resulted a large number of loess hazards.Study on freezing-thawing mechanism has some important theoretical and practical significance to reduce loess slope hazards.This paper presents the characters of both loess slope and freezing-thawing.It uses a numerical simulation of the surface freezing temperature.It makes an analysis of groundwater accumulation model before and after freeze.It reveals the freezing process on surface soil of loess slope and water accumulation.It discusses the freezing effect on slope surface and response on stability.The results are a）the freezing effect begins from the surface to the inner,reaches maximum depth about 3months after the freezing;b）analysis of the simple groundwater accumulation model and derivation of the equation of groundwater saturation line;c）the stability of loess slope can be reduced about 25%by the effect of freezing-thawing.

关 键 词：黄土斜(边)坡 冻结效应 地下水聚集 浸润线 稳定响应 

分 类 号：P642.22[天文地球—工程地质学]