Water Science and Engineering 2014, 7(3) 319-330 DOI:   doi:10.3882/j.issn.1674-2370.2014.03.007  ISSN: 1674-2370 CN: 32-1785/TV

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structurally intact loess
remolded loess
tensile strength
shear strength
shear path
failure envelope of principal stress ( Kf line)
strength failure envelope
joint strength formula
LI Rong-Jian
YAN Juan
LIU Jun-Ding
SHAO Sheng-Jun
Article by Li,R.J
Article by Zheng,w
Article by Yan,j
Article by Liu,J.D
Article by Shao,S.J

Characteristics of structural loess strength and preliminary framework for joint strength formula

Rong-jian LI*1, 2, Jun-ding LIU1, Rui YAN1, Wen ZHENG1, Sheng-jun SHAO1

1. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, P. R. China
2. Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Chang’an University, Xi’an 710064, P. R. China


    The strength of structural loess consists of the shear strength and tensile strength. In this study, the stress path, the failure envelope of principal stress ( line), and the strength failure envelope of structurally intact loess and remolded loess were analyzed through three kinds of tests: the tensile strength test, the uniaxial compressive strength test, and the conventional triaxial shear strength test. Then, in order to describe the tensile strength and shear strength of structural loess comprehensively and reasonably, a joint strength formula for structural loess was established. This formula comprehensively considers tensile and shear properties. Studies have shown that the tensile strength exhibits a decreasing trend with increasing water content. When the water content is constant, the tensile strength of the structurally intact soil is greater than that of remolded soil. In the studies, no loss of the originally cured cohesion in the structurally intact soil samples was observed, given that the soil samples did not experience loading disturbance during the uniaxial compressive strength test, meaning there is a high initial structural strength. The results of the conventional triaxial shear strength test show that the water content is correlated with the strength of the structural loess. When the water content is low, the structural properties are strong, and when the water content is high, the structural properties are weak, which means that the water content and the ambient pressure have significant effects on the stress-strain relationship of structural loess. The established joint strength formula of structural loess effectively avoids overestimating the role of soil tensile strength in the traditional theory of Mohr-Coulomb strength.

Keywords structurally intact loess   remolded loess   tensile strength   shear strength   shear path   failure envelope of principal stress ( Kf line)   strength failure envelope   joint strength formula  
Received 2013-03-12 Revised 2013-11-02 Online: 2014-07-25 
DOI: doi:10.3882/j.issn.1674-2370.2014.03.007
This work was supported by the National Natural Science Foundation of China (Grant No. 11072193), the Fundamental Research Funds for the Central Universities (Grant No. 2013G1502009), and the China Postdoctoral Science Foundation (Grant No. 20100481354).
Corresponding Authors: Rong-jian LI
Email: lirongjian@xaut.edu.cn
About author:


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