A construction method for foundation scour protection of marine engineering structures combined with microbial solidification and anti-seepage walls

Abstract

The invention relates to a construction method for foundation scour protection of marine engineering structures combined with microbial solidification and anti-seepage walls. The grouting hole on the top injects fresh water from top to bottom inside the cut-off wall area to form a suitable MICP reaction environment. The method of low pH one-phase injection is used to grout the inside of the cut-off wall area, and the grouting is repeated many times until The anti-scouring strength of the sand formed by microbial solidification reaches the design requirements; the present invention overcomes the uncertainty of applying the MICP technology to the seawater environment, and the solidified soil layer formed has uniform strength, and the construction is simple and the anti-seepage wall is assembled by T-shaped steel sheet piles It is easy to install and dismantle, and has great operational flexibility. It can protect the foundations of various marine structures such as offshore wind turbines, breakwaters, and offshore oil platforms. It is basically non-polluting to the marine environment and has broad application prospects.

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 ...

AI Technical Summary

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.

Images