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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第6期    总第250期    2015年6月

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文章编号:1672-7207(2015)06-2188-08
裂隙性黄土力学特性试验研究
孙萍1, 2,彭建兵3,吴树仁1, 2,卢全中3

(1. 中国地质科学院 地质力学研究所,北京,100081;
2. 国土资源部新构造运动与地质灾害重点实验室,北京,100081;
3. 长安大学 地测学院,陕西 西安,710054
)

摘 要: 裂隙性黄土中存在的节理裂隙结构面改变黄土本身的细微观结构,是黄土地区地裂缝、地面沉陷、滑坡、崩塌和水土流失等地质灾害的构造基础之一。以陕西三原Q2裂隙性黄土为研究对象,分别对0°,30°,45°,60°及90° 5种不同角度裂隙试样进行单轴拉伸试验及三轴剪切试验研究,分析不同角度裂隙黄土试样的拉应力-应变关系及不同围压下不同角度裂隙黄土试样的剪应力-应变关系,探讨裂隙性黄土的抗拉破裂特性及抗剪破裂特性,为深入研究地质环境下黄土体中地质灾害的力学机制提供参考。

 

关键字: 裂隙性黄土;拉伸;剪切;应力-应变;破裂特性

An experimental study on mechanical properties of fractured loess
SUN Ping1, 2, PENG Jianbing3, WU Shuren1, 2, LU Quanzhong3

1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
2. Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resources, Beijing 100081, China;
3. College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China

Abstract:The joint structural plane changes the fine microstructure of loess itself, and it is one of the structure factors of geo-hazards in loess areas, such as ground fissures, ground subsidence, landslide, collapse and loss of soil and water, etc. Taking Shaanxi Sanyuan Q2 fractured loess as a case study, the loess fracture specimens with five different fracture angles of 0°, 30°, 45°, 60° and 90° were tested by uniaxial tensile test and triaxial shear test. Both the tensile and shear stress-strain relationships of fractured loess specimens under different confining pressures were discussed, and the tensile fracture and shear fracture characteristics were studied, which is enlightening for further research on mechanism of geo-hazards in geo-environment of loess area.

 

Key words: fractured loess; tensile; shear; stress-strain; fracture characteristics

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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