A Constitutive Model for Structured Loess Under High Stress Conditions
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RESEARCH PAPER
A Constitutive Model for Structured Loess Under High Stress Conditions Bin Zhi1 · Pan Wang1 · Enlong Liu1,2 · Wei Liu3 Received: 11 January 2019 / Accepted: 26 October 2019 © Shiraz University 2019
Abstract With the increasing height of buildings constructed in the ground with a thicker fill in the loess area of northwest China, it is urgent to formulate a constitutive model for structured loess, which can reasonably calculate the stress–strain characteristics of structured loess under high stress states. In this paper, a new constitutive model that can describe the stress–strain properties of structured loess under high stress states is proposed based on the binary-medium model and homogenization theory, in which the structural parameters reflecting the breakage process of structured loess under low and high stress states are defined. Through triaxial compression test of structured loess at stress levels ranging from low to high confining stress, the parameters of the constitutive model are determined. By comparing the computed and tested results of triaxial compression under different confining stresses, the constitutive model proposed here is proved to be reasonable. Keywords High stress · Structured loess · Binary-medium constitutive model · Breakage ratio
1 Introduction The northern region of Shaanxi province is located at the center of the loess plateau, with a total area of about 90 thousand square kilometers, and the topography of this region presents an overall trend of high northwest and low southeast. The loess plateau area has formed the basic landform of loess tableland, loess hill, and loess gully under the action of river-cut and soil erosion (Chai et al. 2006). In recent years, with the continued implementation of ‘The Great Western Development Strategy’ and the presentation of ‘The Belt and Road Initiative,’ the northern region of Shaanxi province has been greatly developed in all aspects,
* Pan Wang xust‑[email protected] 1
School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, People’s Republic of China
2
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, People’s Republic of China
3
China Electronic Research Institute of Engineering Investigation and Design, Xi’an 710054, People’s Republic of China
with the acceleration of urbanization and the construction of industrial parks and infrastructure, resulting in the gradual reduction in land resources. Therefore, people have to fill the loess gully to meet the demand of land resources, which leads to a large number of loess high-fill projects in this area. However, there are many engineering problems in the construction of loess high-fill, which bring huge economic loss to the society due to the lack of systematic understanding of the deformation mechanism and constitutive models of structured loess. Therefore, it is necessary to study the constitutive model of structured
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