The 'harmlessness, minimization, and resource utilization' disposal of garbage is one of the ultimate goals of China's modernization construction. Sanitary landfilling remains one of the main methods for garbage disposal in China at present and in the future. There are more than 2,000 active landfills in China, some of which suffer from issues such as inadequate design considerations, low construction quality, and non-standard operational management. These problems lead to high water levels in the landfills, inefficient recovery of landfill gas, and high concentrations of pollutants, which can easily trigger a series of environmental geotechnical disasters with a wide range of impact and long duration. In response to China's high-kitchen waste and high-moisture content garbage, this project includes theoretical innovation, technological research and development, and engineering application. It has engaged in more than a decade of collaboration between industry, academia, and research institutions. By using large-scale indoor experiments, field tests, analytical and numerical simulation methods, it has formed a set of key technologies for active regulation of water and gas in landfills and barrier isolation. The technical difficulties of resource utilization and environmental pollution control in landfills have been solved, providing technical support for the design and operation of environmentally friendly garbage landfills in China. The innovative achievements are as follows: 1. Characterization of biochemical and physical mechanical properties of waste soil and testing technology: Utilizing independently developed large shear instruments, etc., we systematically tested the shear strength, water retention curve, and permeability coefficient of different aged waste soils, quantitatively characterizing the impact of biochemical phase changes in waste soil; established a coupled biochemistry degradation model of waste soil stress-strain constitutive model and unsaturated VGM seepage calculation model; used high-density electrical methods to test the three-dimensional spatial distribution of leachate within multiple landfills in China, proposing real-time monitoring methods for the migration of landfill leachate; 2. Design method and active regulation technology for water and gas drainage system inside landfills: Established a multi-field coupling calculation model including biochemical degradation of waste body - skeleton deformation - water and gas migration - heat transfer, The program was independently developed to solve complex three-dimensional coupled problems; the acceleration effect of leachate re-injection on landfill stabilization was quantitatively characterized, and the optimal re-injection intensity was proposed; a method for designing an air extraction system considering the heterogeneity of garbage was proposed, and a combined re-injection-aeration stabilization acceleration technology was developed, which can shorten the maintenance time of landfills by 70%; The anti-seepage mechanism and methane reduction technology of the landfill cap system: A long-term service performance evaluation method for the cap system considering vegetation and atmospheric environmental impacts was proposed; a capillary retarding type cap system soil column model was constructed in an open environment typical of humid areas to study its working mechanism and performance, with results included in national industry standards; a new type of active control cover layer with embedded porous aeration pipes was developed, analyzing its service performance under complex environments, and corresponding design guidelines were compiled; 4. Evaluation of the Barrier Mechanism and Service Performance of Landfill Leachate Barriers: Developed an efficient dialysis experimental method to determine the diffusion characteristics of low confining pressure or high slump fillers, revealing the impact of bentonite content; established a transient analytical model for pollutants in composite liners, solving the problem that traditional methods are difficult to simulate the transient effects of pollutants and underlying limited thickness soil layers; proposed vertical anti-seepage reinforcement measures for old landfills based on vertical isolation walls for high water level landfills in China. This project has authorized and applied for a total of 21 patents and software copyrights, published 117 papers domestically and internationally, with 59 papers included in SCI, published 3 monographs, and participated as main/co-author in 2 industry and local standards. National first-class science and technology novelty consulting unit 'Shanghai Library (Shanghai Science and Technology Information Research Institute)'. "It is pointed out that this scientific research achievement has significant innovation compared to domestic and international literature. The results have been successfully applied to multiple landfill projects such as Shanghai Laogang, Wuxi Taohua Mountain, and Xi'an Jiangcun Gully, with an additional output value of nearly 370 million yuan in the past three years, a profit increase of nearly 150 million yuan, and savings of about 420 million yuan. With the widespread construction of garbage landfill projects in China and the increasing requirements for pollution prevention and control, the promotion of this project's complete set of technologies will bring tremendous economic, social, and environmental benefits."