Research on key technology of deep foundation pit support construction for bearing platform under complex geological conditions

DOI

10.2991/978-94-6463-429-7_16How to use a DOI?

Keywords

Pit support; construction technique; interlocking sheet pile; complex geology

Abstract

The safety of excavation support structures during foundation pit excavation has long been a matter of concern in construction projects. This study focuses on a case study of a bridge foundation pit excavation project near the Yalong River. It investigates the key technical challenges faced under complex geological conditions, including thick rock formations. Various design options for support structures were compared and evaluated to choose the most effective construction measures. Subsequently, a three-dimensional model of the abutment support structure was created using midas finite element software to assess its bearing capacity and stability. The findings reveal that for deep foundation pits with complex geological conditions involving rock formations over 10m thick, employing interlocking bored piles with impact drilling is a more scientifically sound approach. This approach offers benefits such as minimal deformation, effective seepage control, structural safety, and cost-effectiveness. The calculated bearing capacity and stability both meet the required standards. Additionally, employing a mud and sand separator during the drilling pile construction process enhances efficiency and reduces cleaning time. Moreover, ensuring the integrity of the I sequence piles and thoroughly removing mud skin from the pile foundation during the construction process contribute to improved seepage control.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Qingru Yu
AU  - Ming Li
AU  - Yuelong Dai
AU  - Haiao Zheng
PY  - 2024
DA  - 2024/06/07
TI  - Research on key technology of deep foundation pit support construction for bearing platform under complex geological conditions
BT  - Proceedings of the 2024 7th International Conference on Structural Engineering and Industrial Architecture (ICSEIA 2024)
PB  - Atlantis Press
SP  - 138
EP  - 153
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-429-7_16
DO  - 10.2991/978-94-6463-429-7_16
ID  - Yu2024
ER  -