Synchronous mortar containing muddy water shield waste mud and preparation method thereof

Abstract

The invention provides a synchronous mortar containing muddy water shield waste mud, each mortar is calculated by weight percentage on a dry basis, 20% to 30% of shield waste mud, 30% to 45% of screened slag, and 16% of blast furnace slag powder ~27%, phosphorus slag powder 3%~5%, desulfurization gypsum 3%~7%, and 4%~7% active admixture, water is calculated according to the solid concentration of 60%~85%. The shield waste mud mentioned above is the waste produced by muddy water shield construction, the particles below 0.074mm account for more than 95%, the montmorillonite content is not less than 80%, the specific gravity is not less than 1.20, and the apparent viscosity is not less than 40mPa .s. The technical scheme of the present invention absorbs a large amount of muddy water shield waste mud on the spot, and can also process screening slag and industrial waste; (3) The synchronous mortar containing muddy water shield waste mud has better performance, low cost, and environmental protection No secondary pollution.

Description

technical field [0001] The patent of this invention relates to the synchronous mortar containing muddy water shield waste mud, which is mainly based on shield waste mud, mixed with part of screened slag, blast furnace slag powder, phosphorus slag powder, desulfurized gypsum and active admixture, and mixed according to solid Concentration of 60% to 85% is calculated by adding the corresponding amount of water, stirring and mixing to form a synchronous mortar that meets the requirements of mud-water shield construction. Background technique [0002] With the large-scale use of shield tunneling in my country's underground projects, it has become a necessity for many large-scale cross-sea and river tunnel projects. The slurry shield has the advantages of no need for special soil improvement, strong geological adaptability, and high stability of the excavation surface. However, during shield construction, it is usually necessary to use mud to stabilize the excavation surface of ...

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Problems solved by technology

In the existing literature, only Wu Kexiong, Kong Yuqing, Zhou Luming, Xu Xingju, and Zhai Shihong et al. have carried out research on the preparation of synchronous grouting materials from waste mud, but the 1m 3 Synchronous grouting materials can use up to 800kg of waste mud. Currently, the water content of waste mud is generally about 70-85%. According to the density of mortar, it is 2000kg / m 3 Calculated, the dry basis has not yet reached 17% of the total solids, and a large amount of river sand needs to be filled. However, due to the requirements of national river regulation and other requirements, river sand resources are very tight and the price is high. Among them, Yang Zhao also uses a very high price standard Sand is difficult to apply in actual engineering; in addition, it is necessary to add 42.5 grade cement, a higher grade cementitious material, and the cost of mud is higher

On the other hand, mud-water separation and screening of dregs during the shield tunneling process takes up a lot of land resources for Sinotrans to the suburbs. Zhang Yazhou and Zhai Shihong et al. carried out research on the preparation of post-wall grouting grout by separating the dregs, but the separated dregs need to be cleaned and cleaned. Further screening will not only increase the actual cost and process difficulty, but also cause the problem of reprocessing the generated mud wastewater, and require a large amount of P·O42.5 cement or rapid hardening Portland cement. The application range is limited

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