New method for the mechanical characteristics of self-weight collapsibility testing of loess foundation based on centrifugal model test
Songli Jin, Jun Hua Yan, Le-chen Li, Bo Wang, Shuaifeng Wu, Liming Sun · Mechanics of Advanced Materials and Structures · 2022
The mechanical characteristics of self-weight collapsibility of loess is mainly studied through laboratory tests, numerical simulations, and field immersion tests. However, a laboratory test under the lateral restraint condition cannot reflect the 3D stress state of soil and the influence of lateral extrusion deformation. The numerical simulation method is complex, and the calculation results depend on the accuracy of the constitutive model of loess deformation. Although the field immersion test produces results consistent with the stress and deformation conditions of actual foundations, the test cycle is long, and the cost is high. To overcome these issues, based on the strong self-weight collapsible loess in Ili, Xinjiang, and the variation laws of its physical and mechanical properties along the buried depth, a site is generalized and layered, and typical soil layers are selected to prepare a centrifugal model. A centrifugal model test is then conducted on the self-weight collapsible loess foundation. Taking the regional correction coefficient as the index, the rationality of the new method is verified by comparing the results of the centrifugal model test with those of the laboratory test and field immersion test.