Study on collapsibility of typical structural loess by multi-parameter comparative analysis

Liu Hongcheng,Wang Yinxia,Lu Changwei,Fu Rui,Guan Xiangfeng,Song Yi,Cao Jingfeng,Yang Zhao,A Caggiano

doi:10.1051/e3sconf/202129301032

Abstract

To study the collapsibility of typical loess and its influencing factors in different areas, the samples in Jingyang, Lanzhou and Yili were studied. The correlation between initial moisture content, dry density, composition of particle size, structural parameters and the coefficient of subsidence is analyzed. The results show that: the coefficient of collapsibility is negatively correlated with the initial moisture content and dry density. In the experiments of multiple groups, the collapsibility coefficient has a certain correlation with the clay content, but not a uniform correlation with the particle content. The collapse coefficient is approximately positively correlated with the composite structure potential.

Highlights

Loess is a special soil formed in the Quaternary Period and widely distributed in the world
The study of loess collapsibility and its controlling factors in different areas is of great significance to the prevention and control of geological disasters and the safety of engineering construction in loess distribution areas
Some scholars have explored the influence of physical and mechanical properties such as water content, dry density, plastic index and pressure on loess collapsibility, and the results show that the collapsibility coefficient has a good correlation with the above parameters [7]

Summary

Introduction

Loess is a special soil formed in the Quaternary Period and widely distributed in the world. The special material composition and structure of loess make it have special engineering properties, such as collapsibility. These special properties are easy to cause a variety of geological disasters and engineering problems, such as slope instability, foundation settlement and tunnel collapse. Many engineering problems in loess area are directly caused by loess collapsibility deformation and its mutation. In view of these problems, some scholars have explored the calculation model of unsaturated loess collapse deformation, and studied the influence of discontinuous distribution of collapsible units on the law of collapse deformation [5][6]. Some other scholars have qualitatively and quantitatively analyzed the types of loess microstructure and the influence of various experimental parameters on collapsibility from the microscopic perspective [14][15]

Methods

Results

Conclusion