Research on the Collapse Coefficient of Collapsible Loess under Unloading. (13th February 2021)

• Record Type: Journal Article
• Authors: Zhi, Bin; Wei, Pingping; Wang, Xiaochan; Li, Zengyue; Ren, Yilong; Zhang, Hui; Li, Jinhua; Deng, Botuan
• Other Names: Xu Jian Academic Editor.
• Is Part Of: Advances in civil engineering. Volume 2021(2021)
• Publication Date: 2021-02-13
• Subjects: Civil engineering -- Periodicals; Civil engineering; Periodicals; 624
• DOI: 10.1155/2021/6672301
• Languages: English
• ISSNs: 1687-8086

Abstract

Abstract : In the geogenetic overburden excavation of underground space projects (such as comprehensive pipe corridors or subways), the foundation stress is in an unloading state. The effect(s) from the unloading on the coefficient of subsidence in the loess area should be considered. In this study, to explore the effect of unloading on the collapsibility of loess, the collapsible loess in the Guanzhong area was considered as the research object. An expression for the unloading collapse coefficient was established based on the unloading stress ratio, unloading collapse ratio, and other parameters. The influence of the unloading on the loess collapse coefficient was studied using an indoor collapsibility test, and the function form and parameters for the expression were determined. As combined with the field test, the accuracy of the expression for the unloading coefficient was verified based on the test value for the specific collapsibility, calculated value for the specific collapsibility, and calculated value for the unloading collapsibility.