兰州高坪黄土湿陷系数的试验压力取值探讨  

Investigation in magnitude evaluation of collapsibility coefficient of loess on high fluvial terrace in Lanzhou by means of pressure testing

作　　者：胡燕妮[1] 米海珍[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2008年第6期135-138,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省自然基金项目(3ZS042-B25-031);甘肃省333科技人才工程基金

摘　　要：湿陷性黄土场地的湿陷性质、类型评定与侧限浸水压缩试验的测试压力关系密切.考虑地区、基础型式、埋深和应力扩散的综合影响,确定湿陷系数测试压力,为准确确定地基的湿陷量提供依据.通过兰州两处高坪8个不同位置的湿陷性黄土的室内湿陷性试验,分析黄土密度、含水量、湿陷系数沿深度的变化规律.针对中小型建筑工程采用条形基础时,考虑3个不同基底压力在地基中的附加应力扩散规律,探讨饱和黄土地基总应力沿深度的变化规律,给出不同深度的黄土湿陷系数的浸水压力的建议值表.The collapsibility of collapsible loess site and the assessment of its variety were closely related to the inundation pressure measured in the side-limited inundation compression test. The determination of collapsibility with the tested inundation pressure was conducted with the consideration of the combined in- fluence of the region, foundation, embedment depth, and stress diffusion on it, providing a basis for its accurate determination. On the basis of indoor test of physical indices of collapsible loess taken from 8 sites on two high fluvial terrace in Lanzhou, the vertical variation pattern of the loess density, moisture con- tent, and collapsibility coefficient was analyzed. Aimed at the middle- and small-sized construction projects with striped foundation and taking into consideration the diffusion pattern of additional stress within the foundation with three different base pressure, the vertical variation pattern of the principal stress within the saturated loess foundation was investigated and a suggestive value table of inundation pressure was given for determining the collapsibility coefficient of the loess at various depths.

关 键 词：黄土 湿陷系数 湿陷压力 室内试验 

分 类 号：TU443[建筑科学—岩土工程]