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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第10期    总第254期    2015年10月

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文章编号:1672-7207(2015)10-3879-09
质量密度及围压影响的堆积碎石土变形特性分析
董辉1, 2,胡自然1,傅鹤林3,陈铖1,陈玺文1

(1. 湘潭大学 土木工程与力学学院,湖南 湘潭,411105;
2. 湘潭大学 流变力学研究所,湖南 湘潭,411105;
3. 中南大学 土木工程学院,湖南 长沙,410075
)

摘 要: 考虑质量密度(不同含石量、含水率)及围压对碎石土变形特征的影响规律,对具有级配代表性的湖南昭山区某斜坡堆积碎石土进行试验研究。研究结果表明:质量密度和围压有着联合影响,堆积碎石土在不同质量密度下应力-应变曲线表现为台阶状,即应变先硬化再软化,对于7%含水率的则只出现应变软化;随着围压的增大,初始切线模量和剪切峰值都增大,但不随质量密度的变化而线性增长,屈服轨迹成平行线;在低围压下发生剪缩,高围压发生剪胀;堆积碎石土压硬性对含石量更敏感,剪胀性对含水率更敏感,存在一个最佳含水率和最佳含石量;剪胀率及有效应力比可以成为剪胀性的判断依据。同时发现不同质量密度及围压下的体应变主要集中在2条曲线之间,可以作为连续强降雨雨后滑坡失稳临界状态的一个判断依据。

 

关键字: 滑坡;碎石土;质量密度;压硬性;剪胀性

Analysis of deformation characteristics of eluvial gravel soil under mass density and confining pressure
DONG Hui1, 2, HU Ziran1, FU Helin3, CHEN Cheng1, CHEN Xiwen1

1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China;
2. Institute of Rheological Mechanics, Xiangtan University, Xiangtan 411105, China;
3. School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:Considering the influence of mass density (the different stone content, moisture content) and confining pressure on gravel soil deformation characteristics, an experiment of gradation representative sample eluvial gravel soil of Zhaoshan Hunan province was carried out. The results show that the mass density and confining pressure have a combined effect. Gravel soil stress-strain curve under the different mass density shows as step-like, that is strain at first hardening then softening, strain softening for moisture content of 7%. With the increase of the confining pressure, the initial tangent modulus and shear peak value increase, but non-linear growth with the change of the mass density, the yield locus into parallel lines. Shear contraction under low confining pressure, the high confining pressure dilatation. The pressure-sensitivity of eluvial gravel soil is more sensitive to stone content, the shear dilatation is more sensitive to moisture content, and there are optimum moisture content and the best stone content. Dilatancy rate and effective stress ratio can be a judgment of the dilatancy property. Also volumetric strain is found on different mass density and confining pressure are mainly concentrated in two curves. It can be a judgment for landslide failure after continuous heavy rainfall.

 

Key words: landslide; gravel soil; mass density; pressure-sensitivity; shear dilatation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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