基于割线模量法的压实Q_2黄土加载变形本构模型  

Study of Load Deformation Constitutive Model of Compacted Q_2 Loess Based on Secant Modulus Method

作　　者：李旭东[1] 黄雪峰[2] 段志刚[1] 汪正金 LI Xudong;HUANG Xuefeng;DUAN Zhigang;WANG Zhengjin(Navy of Institute of Engineering Design & Research,Beijing 100070 China;Department of Civil Engineering,Logistical Engineering University of PLA,Chongqing 401331 China)

机构地区：[1]海军工程设计研究院,北京100070 [2]解放军后勤工程学院军事土木工程系,重庆401311

出　　处：《西华大学学报（自然科学版）》2019年第2期86-91,共6页Journal of Xihua University:Natural Science Edition

基　　金：陕西省科技统筹创新工程计划项目(2012KTDZD03-04)

摘　　要：为预估沟谷型黄土高填方的总沉降量并指导现场施工,对压实黄土的加载变形本构模型进行研究。在侧限条件下,利用自建Gunary EXT模型拟合不同初始压实度和初始含水率条件下压实黄土的应力-应变关系;在此基础上利用割线模量法建立压实黄土的加载变形本构模型;在仅考虑竖向变形的理想条件下,利用该模型预估沟谷型黄土高填方的总沉降量。研究结果表明:Gunary EXT模型可较好地拟合不同初始条件下压实黄土的应力-应变关系;加载变形本构模型预估沟谷型黄土高填方的总沉降量的方法可行,该方法的预估结果可用于指导现场施工。To estimate the total settlement of high loess-filled embankment in valley type and directing site operation,this paper carries out research on the load deformation constitutive model of compacted loess.A self-defined extended Gunary modelwas used to expressthe vertical pressure-strain curves of compacted loess with different initial compaction degree and initial water contentin confined compression.On the basis,a load deformation constitutive model of compacted loess was built based on secant modulus method,and the total settlement of high loess-filled embankment in valley type was estimated by this model under the ideal conditions of considering the vertical deformation only.The results show that the vertical pressure-strain curves of compacted loess with different initial conditions can be expressed well with extended Gunary model,and it is feasible to estimate the total settlement of high loess-filled embankment in valley type by using the load deformation constitutive model.The estimated results can provide reference for the site operation of the high loess-filled embankment.

关 键 词：黄土高填方 压实黄土 割线模量 GunaryEXT模型 本构模型 

分 类 号：TU444[建筑科学—岩土工程]