The research results of this project belong to the field of civil engineering and construction. With the rapid development of underground space development and utilization in soft soil areas such as Shanghai, during the construction process of underground projects, the dewatering within the foundation pit will inevitably induce surface deformation in local areas around the pit. This latter issue not only threatens the safety of buildings (structures) around the pit but also exacerbates the existing regional ground subsidence in soft soil areas, severely affecting the building environment and the safe operation of the entire city. This project adopts the method of recharging surface water outside the foundation pit to control the change of groundwater level around the pit, thereby achieving the control of ground subsidence induced by dewatering. After years of joint research and development by industry, academia, and research institutions, the following innovative achievements have been made: 1. A theoretical calculation method for ground subsidence induced by construction based on integrated pumping and irrigation. The classical soil mechanics elastoplastic theory (including the Cambridge model) assumes that the stress-strain relationship of soil during unloading and reloading processes is elastic. However, in reality, plastic strain also occurs during this process; and once normally consolidated clay enters the unloading and reloading process, it is in a superconsolidated state, meaning that even superconsolidated states can produce plastic strain. During the construction of foundation pits, the groundwater level fluctuations caused by pumping (or refilling) leading to shallow groundwater levels (dry-wet (suction) cycles) essentially represent an unloading-loading process. In response to this issue, for the first time, the lower loading surface Cambridge model was introduced, combined with the soil-water characteristic curve and the theory of water-soil coupling, focusing on analyzing and simulating the variation patterns of the foundation pit seepage field and stress field, forming a calculation theory for ground settlement induced by integrated pumping and filling in engineering construction. 2. Recharge and Ground Deformation Monitoring Technology. In response to the difficulty of implementing recharging in soft soil layers, patented technologies such as 'A kind of micro-pressurized water relief well sealing device within the foundation pit', 'A well-forming structure for reducing pressure and precipitation within interfering strata inside the foundation pit', and 'An automatic control system for foundation pit precipitation' have been developed to improve recharging efficiency, achieving timely and effective recharging, as well as precise on-site control of the precipitation process; a field monitoring technology for ground settlement induced by underground construction based on integrated pumping and recharging control has been formed. 3. Integration and demonstration of construction-induced ground settlement control technology based on integrated pumping and recharging. For the first time, a set of technologies for engineering precipitation within foundation pits and controlling ground settlement around them based on the concept of integrated pumping and recharging has been integrated, and an enterprise standard has been compiled. These technologies have been successfully applied to the foundation pit precipitation project of Shanghai Shanda. The demonstration project of groundwater level change and surface subsidence during recharge in the No. 3 plot on Huaihai Middle Road, as well as other major engineering practices such as the Hengqin Island Cross-sea Tunnel of the University of Macau, revealed the quantitative relationship between groundwater level changes and surface settlement during recharge and their linkage laws. It solved the problem of groundwater level control and surface deformation control in case studies, providing a demonstration for controlling surface subsidence caused by underground construction in soft soil areas. The project has obtained a total of 7 authorized national patents; published 17 papers, including 2 SCI-indexed and 7 EI-indexed papers; compiled 1 standard/guideline. The project's achievements have been successfully applied in Shanghai, Macau, and other places, achieving direct economic benefits of about RMB 230 million. With the promotion of this complete set of technologies on a larger scale, it will inevitably generate even greater economic and social benefits. The results were evaluated by renowned experts: The overall level is at the international advanced stage, with some key original technologies reaching the international leading level. The conclusion drawn from the 'Scientific and Technological Project Consulting Report' (No. 20141349) issued by the national first-class science and technology novelty search unit, Shanghai Science and Technology Information Center of the Chinese Academy of Sciences, is that: 'Multiple core technologies of this subject have obtained patent authorization, and the overall technology has reached the international advanced level.' The achievements have also greatly promoted the development of disciplines and industry technological progress, comprehensively enhanced the independent innovation capability of enterprises, the integration level of technical equipment, and the core competitiveness both domestically and internationally.