This project belongs to the field of geotechnical engineering technology, and the research object is landfill, a new geotechnical structure. At present, environmental disasters such as leakage and explosion of landfill gas, leakage and spread of leachate, and deformation and instability of garbage dumps are common in large and simple landfills in service in my country. Therefore, my country urgently needs to study key technologies for landfill instability and pollution control, so as to ultimately realize the country's major demand for "harmless, reduced, and resource-based" disposal of urban waste. For my country's garbage with high kitchen waste and high water content, this project aims to improve resource utilization, reduce disaster risks, and control environmental pollution. It uses a series of means such as testing, theory and numerical values. After nearly 10 years of joint research and engineering practice, a set of landfill instability disasters and pollution control technologies under complex conditions have been formed, successfully solving the technical problems of controlling landfill structure disasters and environmental problems. It meets the requirements of safe design and operation of landfill sites-full-life maintenance with controllable catastrophic pollution. The innovative results achieved by the project are as follows:
(1) In terms of liquid-gas coupled migration laws and control technologies in landfills, a calculation formula for leachate production based on liquid-production mechanism and water balance, a design method for leachate drainage and joint recharge are proposed, which solves problems such as poor leachate drainage effect and high water level in typical landfills; a design method for gas recovery under complex gas extraction conditions in layered landfills is proposed; The interaction model of chemical field, stress field, temperature field and seepage field in the landfill is established, and a liquid-gas migration control technology based on multi-field coupling is proposed.
(2) In terms of landfill instability mechanism and disaster control technology, large-scale static and dynamic triaxial tests of garbage were carried out, and the shear strength index, dynamic shear modulus and damping ratio values of typical garbage soil in our country were proposed; through large-scale interface shear tests, the shear failure mechanism of the bottom liner of the landfill was revealed, an elastoplastic damage constitutive model for the geotextile interface was established, and a design method for the instability failure of the landfill along the bottom liner was proposed; A calculation model for dynamic response and permanent deformation of the landfill was established, and design criteria for safety control of the landfill under earthquake were proposed.
(3) In terms of the mechanism of leachate pollutants penetrating the anti-fouling barrier and the evaluation of service performance, the adsorption mechanism of pollutants by impervious materials was revealed, and a database of penetration, diffusion and adsorption characteristics of leachate pollutants in impervious materials was established; For the first time in the world, a migration model considering the coupling of leakage and diffusion of pollutants in geomembrane was established, and a service life evaluation standard for composite liners based on the breakdown time of main pollutants was proposed.
(4) In terms of the improvement mechanism and design method of anti-fouling barriers, the improvement mechanism of anti-fouling barriers based on biochar and soil materials was revealed, and the important phenomenon that loess in loess-silt-bentonite first exerts its strong adsorption capacity was discovered; An anti-fouling barrier improvement method based on biochar and soil materials such as loess was proposed, and anti-fouling barrier design guidelines based on penetration, diffusion and adsorption properties were established.

This project authorized and applied for 23 patents (including 6 authorized invention patents and 11 utility model patents); published a total of 113 domestic and foreign papers, 47 of which were included in SCI, 90 in EI, and cited 497 times at home and abroad., published 3 monographs and participated in the compilation of 1 industry specification. The novelty search report issued by the Ministry of Education and the "Tongji University Science and Technology Novelty Search Workstation", a city-level novelty search institution in Shanghai City, points out that the scientific research results of this project are obviously innovative compared with domestic and foreign literature. In recent years, this achievement has been successfully applied to landfill projects such as Shanghai Laogang, Xi'an Jiangcungou and Suzhou Qizishan, achieving direct economic benefits of approximately RMB 210 million. With the extensive construction of urban waste landfill projects in my country and the improvement of pollution prevention and control requirements, the promotion of the complete set of technologies for this project will produce greater economic, social and environmental benefits.