Geomechanics and Engineering

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Experimental study on the vertical bearing behavior of nodular diaphragm wall in sandy soil based on PIV technique

  • Jiujiang Wu (Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology) ;
  • Longjun Pu (Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology) ;
  • Hui Shang (Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology) ;
  • Yi Zhang (Shanghai Horizon Construction Development Co., Ltd.) ;
  • Lijuan Wang (State Key Laboratory of GeoHazrd Prevention and GeoEnvironment Protection, Chengdu University of Technology) ;
  • Haodong Hu (Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology)
  • Received : 2023.05.24
  • Accepted : 2023.09.26
  • Published : 2023.10.25
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Abstract

The nodular diaphragm wall (NDW) is a novel type of foundation with favorable engineering characteristics, which has already been utilized in high-rise buildings and high-speed railways. Compared to traditional diaphragm walls, the NDW offers significantly improved vertical bearing capacity due to the presence of nodular parts while reducing construction time and excavation work. Despite its potential, research on the vertical bearing characteristics of NDW requires further study, and the investigation and visualization of its displacement pattern and failure mode are scant. Meanwhile, the measurement of the force component acting on the nodular parts remains challenging. In this paper, the vertical bearing characteristics of NDW are studied in detail through the indoor model test, and the displacement and failure mode of the foundation is analyzed using particle image velocimetry (PIV) technology. The principles and methods for monitoring the force acting on the nodular parts are described in detail. The research results show that the nodular part plays an essential role in the bearing capacity of the NDW, and its maximum load-bearing ratio can reach 30.92%. The existence of the bottom nodular part contributes more to the bearing capacity of the foundation compared to the middle nodular part, and the use of both middle and bottom nodular parts increases the bearing capacity of the foundation by about 9~12% compared to a single nodular part of the NDW. The increase in the number of nodular parts cannot produce a simple superposition effect on the resistance born by the nodular parts since the nodular parts have an insignificant influence on the exertion and distribution of the skin friction of NDW. The existence of the nodular part changes the displacement field of the soil around NDW and increases the displacement influence range of the foundation to a certain extent. For NDWs with three different nodal arrangements, the failure modes of the foundations appear to be local shear failures. Overall, this study provides valuable insights into the performance and behavior of NDWs, which will aid in their effective utilization and further research in the field.

Keywords

Acknowledgement

This research is supported by the National Nature Science Foundation of China (Grant No. 42007247), National Foreign Expert Project (No. DL2023036001L), Nature Science Foundation of Sichuan Province (No. 2022NSFSC1151), Scientific and Technological Innovation Projects of Housing and Urban-rural Construction in Sichuan Province (No. SCJSKJ2022-09) as well as Selected Funding of Scientific and Technological Activities for Oversea Talents in Sichuan.

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