A kind of easily degradable environment-friendly dispersing foam agent for mudstone geological shield and preparation method

Abstract

The invention relates to an easily degradable environment-friendly dispersing foaming agent for mudstone geological shield and a preparation method. The foaming agent is calculated according to the weight percentage, and is composed of the following raw materials by weight percentage: 5-15% of alkyl ethyl sulfonate , rhamnolipid 2-5%, lactate 1-3%, carrageenan 0.5-1%, citric acid 1-3%, potassium tannin 0.5-2%, chitosan 0.2-0.7%, more The amount is water. The raw materials used in the present invention can be rapidly degraded by microorganisms in the natural environment, and there is no secondary toxic by-products, which highlights the great environmental protection feature. The prepared foaming agent has the advantages of small environmental impact, strong foaming ability, good foam stability, fast mudstone dispersion speed, and excellent slag soil improvement effect. It solves the technical problems such as the traditional foaming agent polluting the soil and water environment and the mudstone dispersion effect is poor, expanding the backfill treatment method of shield slag, and at the same time increasing the efficiency of mudstone geological shield, reducing the cost of shield construction, environmental protection and economy. The benefits are significant.

Description

technical field [0001] The invention relates to the technical field of shield construction, in particular to an easily degradable environment-friendly dispersing foam agent for mudstone geological shield and a preparation method. Background technique [0002] At present, large and medium-sized cities in China are vigorously promoting the construction of urban rail transit projects. The most commonly used construction method is the earth pressure balance shield, because the earth pressure balance shield has a wide range of applicable geology, high construction efficiency, and low investment in equipment costs ( Compared with the mud-water balance shield) and low construction cost, it has technical and economic advantages. Usually, a variety of geology will be involved in a short shield distance. In order to improve the efficiency of the shield, reduce the wear of the cutter head, and improve the safety of the shield construction, the shield technicians need to carry out the w...

AI Technical Summary

Problems solved by technology

However, with the improvement of civilized and environmentally friendly construction requirements, the residual foaming agent in the muck is required to have a good natural degradation ability under environmental conditions. Traditional foaming agents mostly use ethoxylated nonylphenol and lauryl polyoxyethylene. As the main component, the active agent has poor environmental microbial degradation performance and cannot meet the needs of environmental protection.

[0003] Patent CN110935393A discloses an environmentally friendly foam preparation and its preparation method. The main components of the foam agent disclosed in this patent are sodium lauryl sulfate, octylphenol polyoxyethylene ether, alkylphenol polyoxyethylene ether and fresh-keeping agent, etc. , of which octylphenol polyoxyethylene ether and alkylphenol polyoxyethylene ether have poor environmental degradation performance

Patent CN109628076A discloses a foam agent composition for earth pressure balance shield tunneling and its preparation method, which uses lipopeptide surfactants, sophorolipids, welan gum and soybean protein as the main components of the foam agent, and adopts Biodegradable raw materials, good environmental performance, but no mention of the dispersion performance of the foaming agent

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