Application and Research of Abandoned Slurry Treatment Technologies in Metro Tunnel Construction from the Perspectives of Climate Crisis and Sustainable Development

With the acceleration of national infrastructure construction, more and more cities have started to build urban subways. Civil engineering works such as stations and sections inevitably generate a large amount of waste slurry during the construction process, leading to resource waste and environmental pollution. Green construction is the trend and inevitability of the development of the construction industry. The direct discharge of waste slurry causes great pollution to the environment. At the same time, the cost of transporting the slurry out is very high. Therefore, the zero-discharge treatment of separating water from waste slurry is a trend and necessity. In response to this problem, a combined process of a cyclone desander and a horizontal scroll centrifuge has been developed and adopted for the first time to treat the waste slurry from the retaining structure. This process changes the transportation of slurry out of the site into the transportation of earthwork out of the site plus the discharge of clean water. Engineering applications have shown that compared with the unit price of 110 yuan per cubic meter for the conventional transportation of waste slurry out of the site, the cost has been reduced by 66%. The project has saved a total of 280,000 yuan. It has achieved multiple goals such as cost reduction and efficiency improvement, and pollution reduction. Analyzed from both economic and social benefits, it has the conditions for widespread promotion and application.