A Treatment Method of In-Situ Carbonization and Solidification of Shallow Soft Ground

Abstract

The invention discloses an in-situ carbonization curing treatment method for a shallow soft ground, and belongs to the field of civil engineering ground stabilization. The method includes the steps that pretreated ground soil is broken and stirred through a crawler-type stirrer; a first curing agent and a second curing agent are mixed, the mixed curing agents are sprayed into the ground soil, and the mixed curing agents and the ground soil are evenly stirred; U-type drain boards are inserted at intervals through a board inserting device; a compacting device and a film laying device are started, and films are laid while the treated ground soil is rolled; carbon dioxide gas is injected to carry out ventilating carbonization on the compacted ground soil; the steps are repeated, and the steps of mixing the curing agents for the pretreated ground soil, inserting the drain boards, and compacting, sealing and stabilizing the treated ground soil in a carbonization mode are completed continuously. The treatment system and method are simple and reliable and capable of adapting to a complex environment, construction is safe and efficient, and quantification of the curing agents in ground treatment and resource utilization of carbon dioxide are achieved.

Description

Technical field [0001] The invention relates to the field of civil engineering foundation treatment, in particular to an in-situ carbonization and solidification treatment method for shallow soft foundations. Background technique [0002] At present, the commonly used foundation treatment methods include dynamic compaction method, sand-gravel pile method, vibro-impact method, cement / lime fly ash mixing pile method, grouting method, high-pressure jet grouting pile, pre-compression method, compacted cement / lime soil method, Lime-soil compaction pile method, single-liquid silicification method and replacement method, etc., while soft foundation treatment also includes heap preloading method, vacuum preloading method and reinforcement method. The dynamic compaction method and vibratory impact method have a lot of construction noise; the traditional replacement method has a large amount of work, high cost, and uneven distribution of strength; sand-gravel piles, cement / lime soil piles,...

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Problems solved by technology

[0003] However, according to the existing patents "A Soil Carbonization and Solidification Method and Its Device (Patent No.: ZL201010604013.1)" and "A Treatment System and Method for Using Industrial Waste Gas Heat to Strengthen Soft Ground (Patent No.: ZL201310122135.0) "In the proposed method, carbon dioxide gas is easily leaked along the stirring shaft, resulting in secondary pollution; if the ventilation pipe with holes is directly inserted into the pile soil treated with active magnesia, although the strength of the pile body is improved, the material is wasted. , time consuming

A treatment system for foundation reinforcement and a carbonization pile method (application number: 2014102039788) solves the problem of carbon dioxide gas leakage to a certain extent, but has higher requirements on the carbon dioxide foam blowing agent and its stabilization time, and additional When the moisture content and porosity of the foundation soil are reduced, the strength increase is not obvious, especially for natural foundations with high moisture content, the reinforcement effect is even worse

A carbonation and reinforcement method for pad replacement on soft soil foundations (Application No.: 2014102729571). Although mixtures of different particle sizes are used for replacement and carbonization, the uniformity of foundation treatment and the obvious improvement of foundation strength are ensured, but large-area The replacement of the foundation will increase the engineering volume and cost of foundation treatment, and reduce the construction efficiency

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