Research on Construction and Application of Technical System of Support and Monitoring for Deep and Large Foundation Pit

DOI

10.2991/978-94-6463-793-9_99How to use a DOI?

Keywords

Deep and large foundation pit; Foundation pit support; Foundation pit monitoring; Horizontal displacement; Vertical displacement

Abstract

This study investigates a deep foundation pit project on the south bank of the Taiping River in Chang'an District, Shijiazhuang City, Hebei Province. The project features 7–18 floors above ground and 1–2 underground floors, with excavation depths ranging from 5.5 to 9.3 m under complex geological conditions. A combined “soil nailing wall–pile and anchor” support system was adopted, with upper C20 soil nails (8–12 m) and lower cast-in-place reinforced concrete piles (600–800 mm diameter, 900–1000 mm spacing) combined with prestressed anchor cables. Layered island-style excavation and standardized support procedures were employed to optimize construction. A multi-dimensional monitoring system was implemented, covering slope top horizontal and vertical displacement, deep soil movement, groundwater levels, and road settlement. All measured values remained within alarm thresholds. The maximum cumulative horizontal, vertical, and deep displacements were 5.27 mm, 5.38 mm, and 20.3 mm, respectively. Numerical simulations were performed alongside field monitoring. The simulated results showed similar trends to measured data, with most values slightly lower and a few marginally higher, verifying the model’s accuracy and reliability. A comparative analysis with soldier pile + strut and diaphragm wall systems demonstrated that the adopted scheme offers better cost-effectiveness, adaptability, and environmental performance. The integration of structural monitoring and numerical simulation confirms the safety, stability, and applicability of the support system. These results provide a practical reference for similar urban deep foundation pit projects.

Copyright

© 2025 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  - Chao Cui
AU  - Zhiyuan Zhang
AU  - Zequan Yu
AU  - Jiantao Jia
AU  - Liang Zheng
PY  - 2025
DA  - 2025/07/28
TI  - Research on Construction and Application of Technical System of Support and Monitoring for Deep and Large Foundation Pit
BT  - Proceedings of the 2025 8th International Conference on Traffic Transportation and Civil Architecture (ICTTCA 2025)
PB  - Atlantis Press
SP  - 1187
EP  - 1203
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-793-9_99
DO  - 10.2991/978-94-6463-793-9_99
ID  - Cui2025
ER  -