Analysis of influence factors on end soil reinforcement effect of rectangular pipe jacking

The focus of this paper is on the specific project of an underground pedestrian passage across the existing Middle Jiangdong Road in Nanjing, China. The reinforcement effect of the end soil of the rectangular pipe jacking is analysed. A three-factor and three-level soil reinforcement scheme is designed based on the principle of the orthogonal test. The slip instability theory is supplemented to improve the calculation of the stability coefficient of the reinforced soil, and the ground subsidence above the reinforced soil is calculated by using a numerical model. The optimal reinforcement scheme is determined and applied to the underground pedestrian passage engineering through direct analysis and variance analysis of the results of the orthogonal test. The rationality of the scheme is verified by analysing on-site monitoring and data. The research results serve as a guide in the construction of future rectangular pipe jacking, and the research methodology developed provides a reference for similar underground pedestrian passage projects.