Construction method of scouring protection of marine structure foundation by combining microbial solidification with cutoff wall

Abstract

The invention relates to a construction method of scouring protection of a marine structure foundation by combining microbial solidification with a cutoff wall. The construction method mainly comprises the steps that the cutoff wall is installed around the marine structure foundation, a cover plate is additionally arranged at the top of the cutoff wall, fresh water is injected into a cutoff wall area from top to bottom through a grouting hole in the top of the cover plate to form a suitable MICP reaction environment, grouting is carried out on the inner part of the cutoff wall area by adoptinga low pH one-phase grouting method, and grouting is carried out repeatedly for a plurality of times until the scour resistance of sand formed by microorganism solidification meets the design requirement. The construction method overcomes the uncertainty of the MICP technology applied in seawater environment, a formed solidified soil layer has uniform strength, the construction is easy and convenient, the cutoff wall is formed by assembling T-shaped steel sheet piles, the installation and removal are easy, the operation flexibility is large, scouring protection can be carried out on various marine structure foundations such as offshore fans, breakwaters and offshore oil platforms, the marine environment is basically free from pollution, and the application prospect is wide.

Description

technical field [0001] The invention relates to a construction method for foundation scour protection of marine engineering buildings combined with microbial solidification and anti-seepage walls, and belongs to the field of scour protection for building foundations. Background technique [0002] In recent years, with the continuous development of interdisciplinary research in microbial chemistry and civil engineering, microbially induced calcium carbonate deposition (MICP) has been gradually applied in various related fields. Such as sewage treatment, desert dust control and concrete repair, etc. In addition, it is also widely used to improve the strength and stability of foundation soil. In domestic and foreign research, the mechanism of MICP under freshwater conditions has been well understood, but the research on the MICP reaction process under seawater conditions is still in its infancy. Therefore, the effect of MICP on weak foundation soil in seawater environment has ...

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Problems solved by technology

This grouting process has been proven to be difficult to guarantee the uniformity of the treatment results when dealing with large-scale soil, so after the grouting is completed, the strength uniformity of the formed calcified soil layer is difficult to be guaranteed; one-phase injection refers to microbial urease bacteria and The mineralized liquid is mixed and injected at the same time. This grouting process will form a large amount of calcium carbonate precipitates to block the grouting port at the initial stage of grouting, so it is generally not recommended.

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