Tunnel backing cloth slip casting material capable of preventing duct piece float upward and preparation method thereof

Abstract

The present invention relates to tunnel-wall post-injection pulp material and a preparation method of the tunnel-wall post-injection pulp material. Tunnel back-lining pulp-injection material that can prevent the upward-floating of the duct piece is characterized in consisting of a substrate compound A and an additive compound B, wherein, the substrate compound A includes cement, fly ash, sand and water; the additive compound B includes silicone ash, swell soil, droxyethylcellulose, polyacrylamide, sulfamate, naphthaline water-reducing agent and gluconic acid sodium salt; the ratio of the ingredients (kg / m<3>): 100 to 200 portions of cement, 300 to 600 portions of fly ash, 800 to 1600 portions of sand, 280 to 560 portions of water, 10 to 40 portions of silicone ash, 12 to 30 portions of swell soil, 0.4 to 0.8 portions of droxyethylcellulose, 0.2 to 0.4 portions of polyacrylamide, 0.2 to 0.4 portions of sulfamate, 1.6 to 2.9 portions of naphthaline water-reducing agent and 0.2 to 0.4 portions of gluconic acid sodium salt. The present invention can realize the high stability, high water dispersion prevention, high-efficient water-reducing plasticity preservation and adjustable performance of the pulp-injection material the condensation under the conditions of high water pressure and water satuation, thereby greatly improving the working performance and the durance of the pulp-injection material.

Description

technical field [0001] The invention belongs to building materials, and in particular relates to a post-grouting material for a tunnel wall and a preparation method thereof. Background technique [0002] With the continuous construction of large-scale cross-river and sea tunnels at home and abroad, the shield construction technology under various working conditions will face severe challenges. In the case of large sections and high water pressure, when ordinary synchronous grouting materials are washed by water in high-pressure water-rich formations, the grouting materials will be diluted, resulting in the destruction of the material structure, not only can not play the role of filling the formation purpose, and will directly affect the stability of the segment lining structure, the slurry flows into the segment arch bottom, lifts the segment, and intensifies the uplift of the segment. At the same time, the durability of synchronous grouting material declines, making it los...

AI Technical Summary

Problems solved by technology

[0003] Synchronous grouting materials for ordinary shield tunnels are mainly designed to fill the ground, reduce foundation subsidence, ensure environmental safety, and serve as reinforcement layers for lining structures, but lack functional design and evaluation of materials under special site conditions, especially Under the condition of high water pressure and saturated water, the slurry is easily washed by water, which causes the slurry to lose its filling function, resulting in an unsupported state of the segment. At the same time, the tunnel segment can be regarded as immersed in the liquid, and it will inevitably rise and fall under the action of buoyancy. The subsidence of the foundation seriously affects the structural safety of the tunnel

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