Although grouting technology has been widely applied for lifting and rectifying tilted structures, theoretical research remains underdeveloped and lags behind the practical demands of engineering applications. In this study, a self-developed experimental setup was utilized to conduct model tests on the lifting and rectification of a raft foundation in saturated silty clay. The evolution patterns of ground surface displacement, excess pore water pressure, and foundation-additional pressure induced by grouting were systematically analyzed. Furthermore, the influence of grouting depth and injection rate on surface displacement, excess pore water pressure, foundation-additional pressure, and grouting parameters (grout volume and pressure) was investigated. The key findings are summarized as follows: The grouting efficiency (eta) ranged between 0.72 and 0.81. A power-exponential dual-function model was proposed to quantify the spatiotemporal evolution of excess pore water pressure, achieving a distance-decay power function with R-2 > 0.89 and a time-dependent dissipation exponential function with R-2 > 0.94. The maximum surface uplift displacement decreased by 20.6% and 8.9% with increasing grouting rates, respectively. The dissipation time of excess pore water pressure exhibited a negative correlation with the grouting rate, and grouting efficiency declined as excess pore water pressure dissipated. The maximum foundation-additional pressure occurred directly above the grouting center and gradually diminished as the horizontal distance from the grouting location increased. Variations in surface displacement, excess pore water pressure, and additional base pressure induced by grouting were systematically analyzed.

With the gradual development of urban construction, more high-rise buildings with deep foundations are been constructed near tunnel groups. Analyzing how tunnels and surrounding strata respond to diverse construction strategies and challenging conditions during the excavation is crucial. This examination is instrumental in safeguarding infrastructure and minimizing construction expense. This paper explores the deformation response of structures and ground caused by irregular deep foundation pits that are excavated in structural strata adjacent to a tunnel groups (<5 m), as well as the effect of displacement control through grouting rectification techniques and Metro Jet System (MJS) isolation piles. Firstly, a finite element (FE) model is established to investigate the effects of MJS geometric and mechanical properties on deformation response for tunnels and surroundings. Then, an evaluation of the disturbance of underlying structural strata of the site is carried out to analyze the impact on deformation response. Finally, the displacement control effect of rectification technology is analyzed through a case of adjacent excavation. The results indicate that: (1) Strengthening the geometric and physical properties of MJS piles within a certain range positively contributes to deformation reduction. Additionally, increasing the length of MJS piles preferentially with the same amount of mud improves displacement control more effectively; (2) Increased soil disturbance weakens its structural integrity, amplifying the impact of excavation on structures and surroundings; (3) Employing rectification techniques proves effective in preventing excessive tunnel deformation. This study offers valuable insights for design and construction of deep excavation projects adjacent to tunnel groups.