Abstract：
To meet the construction demands of deep and large shafts in water-rich soft soil strata and address chal?
lenges such as dense surrounding buildings, limited construction sites, and stringent environmental protection requirements in the central urban area, a novel active-control press-in prefabricated shaft construction method was developed. This method integrates the "underwater excavation and press-in sinking" features of the SOCS method and the "shaft segment prefabrication and suspended sinking" characteristics of the VSM method with the key technologies of pipe-jacking, including "thick slurry injection and borehole pressure retention. " The method employs the "press-in and lifting" dual-mode system for stable sinking of the prefabricated assembled shaft segment, utilizes a multi-degree-of-freedom robotic arm with a specialized cutter suction head for fully automated underwater soil excavation, and reduces shaft wall friction resistance by synchronously injecting thixotropic-static slurry. Furthermore, a comprehensive visualized intelligent control system integrates excavation conditions, sinking parameters, shaft posture, and environmental monitoring to achieve precise, micro-disturbance sinking of shaft structure in water-rich soft soil strata in the central urban area. This method was applied to the Xingle Road Escape Shaft project
on the western extension of Shanghai Metro Line 13, achieving favorable results. The maximum average deep horizontal displacement of the soil was 5.10 mm, and the maximum average surface settlement was 4.81 mm.
ZHU Yanfei1 BI Xiangli2 PAN Weiqiang1 GUO Yan1 GUAN Panfeng3
.Research on the Active-control Press-in Prefabricated Shaft Construction
Method Applied in the Central Urban Areas with Water-rich Soft Soils[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(6): 278-285
2024, Vol. 61 