Synchronous grouting slurry for shield tunneling and preparation method thereof

Abstract

The invention discloses synchronous grouting slurry for shield tunneling, which is prepared from materials including desulfurization gypsum generated in a smoke desulfurizing process of a thermal power plant. The slurry comprises the following dry material components in percentage by weight: 68 percent of sands, 20 percent of coal ash, 3 percent of bentonite, 2 percent of lime, and 7 percent of the desulfurization gypsum. The invention also provides a method for preparing the synchronous grouting slurry for field tunneling, which comprises the following steps of: weighing the sands, the coal ash, the bentonite, the lime and the desulfurization gypsum which form the dry materials; uniformly mixing and stirring the dry materials; adding proper water and additives; uniformly mixing and stirring; sampling an index of detection performance; and preparing to grout the finished product. By the method, industrial wastes of the thermal power plant are sufficiently utilized to achieve the effects of reducing slurry cost and reducing environmental pollution, the developing orientation of energy conservation and emission reduction is fulfilled, and the slurry has the advantages of high proportion, low denseness, high shearing resistance, good flow filling performance, improved later strength of slurry and the like and can be used as synchronous grouting slurry for shield tunneling.

Description

Technical field: [0001] The invention relates to a synchronous grouting slurry material for shield tunnel engineering, in particular to a shield synchronous grouting slurry prepared from industrial waste and a preparation method thereof. Background technique: [0002] During shield tunneling construction, synchronous grouting is the main means to fill the construction gap between the soil and the segment ring and reduce the later deformation, and it is also an important process in the shield tunneling construction. In the current construction of shield tunnels, a new type of high shear hardenable single-fluid grout (disclosed by Chinese patent application 200610147635.X) is generally used for grouting construction. The advantages of high shear yield strength and small shrinkage rate of solid bodies in the later stage have played a good construction effect in the current shield tunnel construction in soft soil strata in China, and can effectively control the deformation of th...

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the disadvantage of high cost of grouting materials for synchronous grouting in shield tunnel construction, and at the same time solve the problem of difficult treatment of desulfurized gypsum, a by-product of thermal power plants, and provide a new type of synchronous grouting grout for shield tunneling , which uses desulfurized gypsum as the preparation material, which not only makes full use of industrial waste from thermal power plants, but also does not reduce the effect of synchronous grouting in the current shield tunnel construction, so as to achieve the purpose of energy saving, emission reduction and material cost reduction

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