Study on Deformation Characteristics of Deep Foundation Excavation in Soft-Soil and the Response of Different Retaining Configurations |
| |
| Authors: | Xianshan Liu Shaowei Liu |
| |
| Institution: | (1) School of Civil Engineering, Chongqing University, 400045 Chongqing, China;(2) Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, 400045 Chongqing, China |
| |
| Abstract: | In recent years, many researchers have considered the mechanical characteristics of deep foundation excavation in soft-soil.
The analysis of these deep excavations requires consideration of an uncertain, nonlinear, dynamic and complicated system,
and involves consideration of soil strength, stability, deformation, fluid flow and interaction of soil and different retaining
configurations. It is difficult to describe such a nonlinear system using traditional analysis. Therefore, in order to accurately
describe the mechanical behavior of a representative deep excavation of the subway station, in this case, 3-Dimensional geotechnical
numerical analysis method using FLAC3D software was applied. Using this tool, a study considering earth pressure, soil deformation
and settlement was carried out. Furthermore, the response of different retaining configurations was deeply investigated. Triaxial
cement mixing piles were considered as a way to optimize deformation of the deep excavation and reduce settlement of the ground
surface and the railway embankment. The analysis indicated that the deeper the foundation excavation was, the larger the surface
settlement and the smaller the earth pressure. The analysis also considered the mechanical effect of varying the wall thickness
and the wall depth on the structure‘s deformation characteristics. The simulations indicated that a wall thickness of less
than 1.4 m effectively reduced wall horizontal displacement, ground surface settlement and uneven settlement of railway embankment.
While a variable wall embedded depth that was less than 52 m also changed the settlement of the excavation deformation and
the ground surface. Therefore, the numerical results can agree with the practical project to imply that numerical method in
the paper is applicable and reliable, which provides a new thought to research on deep excavation in soft-soil. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
