Shield slurry preparation process

Abstract

The invention discloses a shield slurry preparation process which comprises the following steps: preparing slurry raw materials of bentonite, a CMC additive, seawater,clear water and sodium carbonate,wherein the main component of the bentonite is montmorillonite, and specifically the slurry raw materials comprise, in parts by weight, 100 parts of seawater, 8-12 parts of bentonite, 0.4-0.6 part ofCMC additive, 0.2-0.4 part of sodium carbonate; weighing seawater, the CMC additive and bentonite in parts by weight, conducting stirring by using an electric mud stirrer at the rotating speed of 1000r / min for not less than 40 minutes, continuously adding bentonite in the stirring process, then putting the stirred mud into a standing tank, and conducting standing for 24-36 hours. During coastal construction, seawater can be directly adopted to prepare slurry capable of being directly used through a construction process, the slurry can be directly used in construction, the treatment and use cost required by clear water or underground water is reduced, and the use efficiency is improved.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a shield slurry preparation process. Background technique [0002] Today's coastal tunnels, offshore construction and cross-river tunnel projects are developing rapidly. The mud-water shield construction technology is mainly used. Through the integration of optical, mechanical, electrical, hydraulic, sensing and information technologies, it has the advantages of excavating and cutting soil, It has the functions of conveying soil muck, assembling tunnel lining, measuring and guiding deviation correction, etc. Therefore, the auxiliary mud used in the excavation process is a necessity during construction. It can penetrate into the ground under the action of cabin pressure and form a layer on the excavation surface. The dense mud film balances the soil-water pressure and plays an important role in maintaining the stability of the face. [0003] However, the existing mud generall...

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Problems solved by technology

[0003] However, the existing mud generally uses clean water or groundwater, and the contact between mud and seawater generally only exists in the working condition of the seawater environment. After the slurry is circulated, it will be treated again according to the amount of seawater it contacts. Generally, clean water or groundwater is involved. The liquid formed after contacting with seawater will gradually lose the film-forming function of the mud, and eventually the rheological properties will deteriorate, affecting the construction quality and construction equipment. When grouting again, it is necessary to re-make the mud. , leading to delays in construction progress and greatly reducing the efficiency of mud use

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