冀西北地区湿陷性黄土路基溶陷变形试验研究  

Experimental Study on Collapse Deformation of Collapsible Loess Roadbed in Northwest Hebei

作　　者：李雪飞[1,2] 常利雲 LI Xue-fei;CHANG Li-yun(Hebei Institute of Civil Engineering,Zhangjiakou,Hebei 075000;Key Laboratory of Civil Engineering Diagnosis,Reconstruction and Disaster Relief of Hebei Province,Zhangjiakou 075000,Hebei;Beijing Guanshan Boyuan Coustruction Engineering Inspection Co.,LTD,Beijing,Yanqing 102100)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075000 [3]北京冠山博源建筑工程检测有限公司,北京延庆102100

出　　处：《河北建筑工程学院学报》2021年第3期34-37,共4页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：2020年张家口市科技计划自筹经费项目(项目编号:2021004A)。

摘　　要：溶陷性是黄土具有的一个显著的特性,当黄土被水浸入,会使黄土生成一系列的孔洞,当受到外部压力作用时黄土中的孔洞被挤压造成不均匀沉降,最终会引发塌陷破坏,为了研究冀西北地区黄土的溶陷特征,本文基于室内试验研究了不同含水率条件下溶陷情况,结果表明:随着试验土样含水率的增加,湿陷性黄土的溶陷变形越大;湿陷性黄土的含水率一定时,随着压强的增大,湿陷性黄土的沉降量不断增加,初次施加50KPa的压强时变形最为明显而后随着压强的增加沉降量趋于平稳;当湿陷性黄土的含水率与压强一定时,试验土样在浸水后沉降量有一个显著增大。Solvability is a significant characteristic of loess.When the loess is immersed in water,a series of pores will be formed in the loess.When subjected to external pressure,the pores in the loess will be squeezed to cause uneven settlement,which will eventually cause collapse and destruction.In order to study the dissolution characteristics of loess in northwestern Hebei,the dissolution conditions under different water content conditions is studied in this paper based on laboratory tests.The results show that as the water content of the test soil samples increases,the dissolution deformation of the collapsible loess increases.When the water content of collapsible loess is constant,as the pressure increases,the settlement of collapsible loess continues to increase.The deformation is most obvious when the pressure of 50KPa is applied for the first time,and then the settlement becomes stable with the increase of pressure.When the water content and pressure of the collapsible loess are constant,the settlement of the test soil sample increases significantly after immersion.

关 键 词：溶陷变形 黄土 室内试验 荷载 

分 类 号：TU4[建筑科学—土工工程]