Research on Ground Deformation Induced by Large Caisson Construction at the Zhuchong Pumping Station in Xinyang, China

Abstract To explore the sidewall friction mechanism between sidewall of caisson and strata, thereby controlling the sinking of caisson project and induced surrounding subsidence. This study takes the large caisson engineering of Zhuchong Pump Station in Xinyang City as the research subject. Through numerical simulation of the sinking process of the pump station caisson and analysis of measured data from subsidence monitoring points on-site. The research results indicate that the caisson induces a parabolic-shaped subsidence curve in the surrounding ground surface. Ground subsidence would increase with the distance closing to the sidewall of caisson. The magnitude and range of ground subsidence around caisson would increase with the increasing of sinking depth of the caisson. The friction between sidewall of caisson and strata has a significant impact on ground subsidence. The study reveals the influence pattern of friction between the caisson sidewall and the surrounding soil on ground surface subsidence. This research may help provide technical references for subsidence control in similar large-scale caisson.