自重湿陷性黄土下限深度判定方法探讨  

Discussion on Judging Methods for the Maximum Depth of Collapsible Loess under Overburden Pressure

作　　者：武小鹏[1,2] 楚华栋 屈耀辉 米维军 魏永梁 

机构地区：[1]兰州大学土木工程与力学学院,甘肃兰州730000 [2]中铁西北科学研究院有限公司,甘肃兰州730000

出　　处：《西北地震学报》2011年第B08期218-222,共5页Northwestern Seismological Journal

基　　金：铁道部科技研究开发计划项目(2005K001-B-1)

摘　　要：以郑西高速铁路沿线6个现场试坑浸水试验资料和大量室内土工试验资料为基础,对自重湿陷性黄土下限深度的判定问题进行探讨。研究表明:自重湿陷性黄土下限深度是一个明确且唯一的值,但由于受应力条件、变形条件、饱和状态、试样尺寸、边界效应等因素的影响,运用现场取样进行室内压缩试验判定自重湿陷性黄土下限深度的方法还存在一定的局限性,其判定结果往往与现场实测结果存在较明显的差异,多大于现场实测结果。建议对自重湿陷性黄土层下限深度的判定应以现场实测结果为准,室内试验判定方法还需要进一步改进。Based on the data of 6 pieces of field immersion test sites and the laboratory test data,judging methods for thickness of collapsible loess under overburden pressure is discussed.The results show that：the maximum depth of collapsible loess under overburden pressure is a determined and unique value.Caused by influences of stress state, deformation conditions,saturation,specimens size,boundary effects and other factors,the results of laboratory tests are different with the results of field immersion test,the former are always bigger than the latter.So,judgment of thickness of collapsible loess under overburden should accord to the results of field test.Laboratory test method needs further improvement.

关 键 词：自重湿陷性黄土 现场浸水试验 室内土工试验 下限深度 判定方法 

分 类 号：TU444[建筑科学—岩土工程]