Abstract:
Pipe jacking construction is highly prone to induces deformation and settlement in soft soil, threatening the safety of surrounding buildings. However, the deformation characteristics of strata induced by the pipe jacking under soft soil conditions remain unclear. In this paper, a combined method of theoretical analysis, numerical simulation, and field measurement is adopted to establish a mechanical model for pipe jacking and a numerical model for simulating deformation in water-rich soft soils with pipe jacking. The deformation law of the strata under different conditions is analyzed, and a micro-deformation control technology for pipe jacking construction in water-rich soft soil strata is proposed and applied. The research results show that strata settlement induced by pipe jacking presents a linner positive correlation with burial depth and a power function decrease with stratum elastic modulus. The theoretical model and numerical simulation results are consistent. The application of the micro-deformation control technology in practical soft soil construction conditions demonstrates good stability and uniformity. Compared to unconsolidated strata, the micro-deformation controlled strata show an average reduction of 73.1% in settlement. Theoretical model values, numerical simulation values, and field measured values of strata of settlement before and after soil reinforcement are in good consistency, with engineering measurements, which verifies the effectiveness of the pipe jacking mechanical model and the reliability of the numerical model for micro-deformation control. The findings provide theoretical methods and technical support for controlling settlement during pipe jacking construction in soft soil strata.