Non-excavation type PRB construction method for underground water pollution

Abstract

The invention provides a trenchless PRB (permeable reactive barrier) construction method for underground water pollution, and relates to the technical field of environmental rock-soil, a reaction zone and a permeable reactive barrier are included, the reaction zone adopts a modified PRB all-in-one machine to realize drilling, material stirring and wall forming functions, and the permeable reactive barrier is constructed by materials meeting the mixing amount of design requirements. The construction technology is small in difficulty, the PRB all-in-one machine is constructed in a non-excavation mode, foundation pit supporting is not needed, the method is particularly suitable for large-depth PRB construction, and the risk of hole collapse is effectively avoided; according to the PRB all-in-one machine, drilling is conducted firstly, then drill lifting is conducted, meanwhile, PRB active materials are poured, the functions of drilling, material stirring and wall forming are achieved, meanwhile, high efficiency of construction is achieved, and cost is reduced; according to the PRB all-in-one machine feeding system, mixing of filling soil and active materials is effectively achieved, the mixing amount needed by the treatment effect is achieved, the durability and the treatment effect of PRB are improved, meanwhile, recycling of the filling soil can be achieved, secondary pollution is avoided, and the PRB all-in-one machine feeding system is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of environment or environmental geotechnical technology, in particular to a trenchless PRB construction method for groundwater pollution. Background technique [0002] Permeable Reactive Barrier (PRB) is an emerging and efficient technology for groundwater remediation, an effective in-situ remediation technology for groundwater pollution (organic matter, heavy metals). It has the advantages of slow treatment time, long treatment time, little disturbance to the environment, and good treatment effect. Therefore, it is gradually replacing the remediation technology with high operating cost and becoming the most potential in-situ remediation technology for groundwater pollution. [0003] There are two common structures of PRB, continuous reaction wall type and funnel-gateway type. Among them, the funnel-gateway type makes up for the deficiency of dealing with large groundwater pollution plumes, requires less rea...

AI Technical Summary

Problems solved by technology

Hydraulic fracturing injection has a large disturbance to the formation, which affects the groundwater flow field, and the preferential channel affects the quality of the wall; the active medium content of the existing construction method of in-situ deep stirring can reach up to 30%, which cannot meet the requirements of the filler content in the reaction zone; the high-pressure rotary spraying method The main injection material is slurry, which is affected by the injection material particles and the formation, and there is also the problem of slurry return, which greatly increases the cost of materials

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