Reinforcing device for reinforcing sand foundation through combination of microorganisms with vacuum drainage and reinforcing method of reinforcing device

Abstract

The invention provides a reinforcing device for reinforcing a sand foundation through combination of microorganisms with vacuum drainage and a reinforcing method of the reinforcing device. The device comprises grouting pipes, drainage pipes, a grouting well array, a drainage well array, vacuum water pumping equipment and slurry grouting equipment, wherein the grouting pipes and the drainage pipes are laid on a sand surface in parallel in the horizontal direction, the grouting well array and the drainage well array are located in the sand foundation below the grouting pipes and the drainage pipes respectively, the grouting well array comprises at least two grouting wells, and the drainage well array comprises at least two drainage wells. The reinforcing method comprises steps as follows: I, the reinforcing device is mounted; II, a bacterial solution and a consolidation fluid are prepared; III, the bacterial solution is injected; IV, vacuum drainage is preformed; V, the consolidation fluid is injected; the steps IV and V are repeated for 6-7 times. According to the reinforcing device and the reinforcing method, directional horizontal migration of the microorganisms in a soil body is realized through vacuum drainage, and the treatment range is enlarged; plug holes produced in the grouting process are reduced, and the reinforcement uniformity is improved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a strengthening device and a strengthening method for strengthening sandy foundations by combining microorganisms with vacuum drainage. Background technique [0002] Biomineralization is ubiquitous in nature and is one of the main functions of the source of calcium carbonate in the earth's crust. This is due to the production of CO by some specific microorganisms during their metabolism. 3 2- , when there is Ca in the surrounding environment 2+ , can induce the formation of CaCO 3 crystals. This microbially derived calcium carbonate cements the loose sand grains and fills the voids to form a concrete-like man-made sandstone body. inducible CaCO 3 Microorganisms include Bacillus Pasteurella, denitrifying bacteria, sulfate-reducing bacteria, etc. However, microbial reinforcement of soil as a technology has emerged in the past decade. In 2005, American...

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Problems solved by technology

Although this technology has many advantages, there are few domestic researches on this technology, which are mainly concentrated in the indoor experiment stage, and the actual app...

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