饱和原状素填土的压缩特性研究及结构性效应初探  

Compression Characteristics and Structural Effects of Saturated Untouched Plain Fill

作　　者：扈胜霞[1] 杨磊 王梦南 陈义乾[1] 刘登杨 HU Shengxia;YANG Lei;WANG Mengnan;CHEN Yiqian;LIU Dengyang(Architectural and Civil Engineering Institute,Yan＇ an University,Yan＇ an,Shaanxi 716000,China)

机构地区：[1]延安大学建筑工程学院,陕西延安716000

出　　处：《水利与建筑工程学报》2018年第4期94-98,共5页Journal of Water Resources and Architectural Engineering

基　　金：陕西省科技统筹创新工程计划项目(2014KTDZ03-01);大学生创新训练计划项目(D2016120)

摘　　要：为研究已有建筑物地基在上部荷载作用下的变形特性,运用从已有建筑物地基下取得的原状素填土,开展了饱和原状土样的一维高压固结试验,分析了其压缩特性、回弹特性和蠕变特性。结果表明:饱和原状素填土的压缩曲线可分为陡降段和平缓段,其屈服强度因土样的结构性出现差异;可用经典的双曲线模型表示其应力应变关系;土样回弹及后继压缩时的孔隙率变化与其所经历的应力历史密切联系,即土样在经历较大压力后再次进入明显塑性变形发展的应力水平有所提高;不同孔位土样在相同的蠕变时间下其应力-应变曲线线型相似。饱和原状素填土在不同应力条件的压缩、回弹及蠕变特性受其内部结构性影响。In order to study the deformation characteristics of foundation soil under upper load,one-dimensional high pressure consolidation tests were carried out on saturated untouched soil samples by using the untouched plain fill obtained from the existing building foundation.The compression characteristics,recompression properties and creep characteristics were analyzed.Results are as follows：the compression curves of saturated undisturbed plain fill can be divided into steep and slow parts;the yield strength is different due to the structure of soil samples;the stress-strain relationship can be expressed by the classical hyperbolic model.The change rate of porosity of the soil sample has close relationship with stress experience during re-compression and the subsequent compression.The stress level of soil sample was improved when has another obvious plastic deformation development after experiencing greater pressure.The stressstrain curves of different drilling location are similar in the same creep time.The compression,expansion and creep characteristics of saturated untouched plain fill in different stress conditions are affected by its internal structure.

关 键 词：原状素填土 压缩 回弹 蠕变 结构性 

分 类 号：TU411[建筑科学—岩土工程]