Application and Quality Control Technology of Diaphragm Wall in Deep Foundation Pit Support

DOI: https://doi.org/10.62517/jcte.202606111

Author(s)

Leidi Cong

Affiliation(s)

Dongguan Xinao Gas Co., Ltd., Dongguan, Guangdong, China

Abstract

Aiming at the common industry problems such as trench collapse, excessive deformation of steel reinforcement cage hoisting, and wall anti-seepage failure in deep foundation pit support of soft soil-sand interbedded stratum, taking a deep foundation pit project in Guangdong Province (working shaft depth 27m, receiving shaft depth 25m) as the research carrier, the optimization of diaphragm wall support system and the key technology research of super-large steel reinforcement cage (maximum weight 30t) hoisting were carried out. Based on the coupling of the modified Cam-clay model and Rankine earth pressure theory, a mechanical calculation model of the diaphragm wall considering the nonlinear characteristics of soil was established to optimize the wall thickness, reinforcement parameters and mud performance indexes. ANSYS was used to establish a three-dimensional mechanical model of the steel reinforcement cage, a stiffness control technology of "truss bar-shear bar collaborative reinforcement" was proposed, the transient force calculation formula in the dynamic hoisting process was derived, and the 16-point lifting point layout scheme was optimized. Combined with MidasGTS numerical simulation and field measured data, a trinity support system optimization method of "theoretical calculation-numerical simulation-field verification" was constructed. A composite support technology of "diaphragm wall + double row jet grouting pile + dynamic mud adjustment" was innovated. The research results solve the technical bottlenecks of deep foundation pit support and super-large component construction in soft soil-sand interbedded stratum, provide a theoretical basis and technical paradigm for similar projects, and have important engineering application value and popularization prospects.

Keywords

Deep Foundation Pit; Diaphragm Wall; Composite Support; Dynamic Hoisting of Steel Reinforcement Cage; Numerical Simulation; Soft Soil-Sand Interbedded Stratum; Deformation Control

References

[1]Zhang S X. Discussion on construction quality control measures of diaphragm wall. Construction Technology, 2025, (32038): 115-117. [2]Cheng X C. Application of construction technology for ultra-deep and ultra-thick diaphragm wall in soft water-rich stratum. Construction Technology, 2022, 51(4): 67-72. [3] He Y C. Deformation control technology for diaphragm wall construction adjacent to existing operating metro station without retaining structure. Urban Mass Transit, 2022, 25(3): 56-60. [4]Liu Q. Research on application of composite foundation with deep mixing pile combined with diaphragm wall in riverside wharf engineering. Port & Waterway Engineering, 2023, (7): 173-176. [5]Mu Y. Research on application of diaphragm wall technology in metro station project under complex geological conditions. Chinese Journal of Geotechnical Engineering, 2021, 43(S1): 258-261. [6]Peng J Y, Wang B, Gu X, et al. Parameter analysis of trenching stability of diaphragm wall in composite soil layer under seepage condition. Modern Tunnelling Technology, 2025, 62(S1): 254-261. [7]Luo Q L, Mai S W. Optimization analysis and evaluation of support structure for ultra-deep foundation pit adjacent to bridge. Highway, 2025, 69(12): 437-445 [8]Kuang Y L, Tan J, Ding G S, et al. Research on construction technology of new and old diaphragm walls with bite connection of plain and reinforced piles. Building Technology, 2025, 56(22): 2762-2765. [9]Guo M W, Dong X C, Shen K J, et al. Study on variation law of end resistance during soil extraction and sinking of super-large open caisson foundation. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(Supp.1): 2976-2985. [10]Mu B G, Chen Z Y, Gong W M. Model test analysis on horizontal bearing performance of open caisson-pile composite foundation. Chinese Journal of Underground Space and Engineering, 2022, 18(1): 190-200. [11]Dong L H, Song D Q, Tang G J, et al. Analysis of the influence of super-large deep foundation pit excavation on the deformation of surrounding environment and countermeasures. Journal of Water Resources and Water Engineering, 2022, 33(1): 199-205. [12]Liu M W, Wang X L, Zhu J J, et al. Temperature tracer test and analysis of leakage defects of diaphragm wall in ultra-deep foundation pit. Journal of Disaster Prevention and Mitigation Engineering, 2025, 45(6): 1525-1531. [13]Tu W B, Huang M S. Horizontal dynamic response characteristics of open caisson-pile composite foundation. Journal of Disaster Prevention and Mitigation Engineering, 2019, 39(2): 285-289.