Chemical dissolution and cleaning dredging method for crystallization blockage of karst tunnel drainage system

Abstract

The invention relates to a chemical dissolution and cleaning dredging method for crystallization blockage of a karst tunnel drainage system. The problems that blockage of the drainage system by karstcrystallization universally exists in tunnel engineering in karst areas, and a serious threat to safety and long-term operation of a tunnel engineering structure is brought are solved. According to the chemical dissolution and cleaning dredging method for crystallization blockage of the karst tunnel drainage system, a polymer carboxylic acid type organic acid reagent with the concentration of 2000-2200 ppm and the dichromate index of 17.71-20% is adopted as a dissolution and cleaning solvent. The chemical dissolution and cleaning dredging method comprises the construction steps of electromagnetic detection of blockage points, arrangement of dissolution and cleaning pipelines, a chemical dissolution phase, auxiliary dredging measures, a cycle cleaning stage, and blockage of dissolution andcleaning pipeline holes. The dissolution and cleaning solvent is environmentally friendly, does not react with cement-based and PVC plastic materials, and can effectively clear karst crystal substances of the drainage system. The construction method can effectively solve the problem of blockage of the drainage system by karst crystallization universally existing in tunnel engineering in the karstareas.

Description

technical field [0001] The invention relates to a method for chemically dissolving, cleaning and dredging crystal blockage in a karst tunnel drainage system. The invention belongs to the technical field of tunnel engineering disease treatment. It is suitable for operation and maintenance of karst tunnel engineering, especially in karst developed areas. Background technique [0002] The area of ​​karst-developed areas in my country is close to 1 / 3 of the country's land area, and the disease problem of karst tunnels is particularly serious. The hazards of karst tunnels mainly come from two aspects: one is the adverse effect of karst development on the long-term stability of the tunnel structure caused by geological structure and rock quality cracking; the other is the erosion effect of karst water on the tunnel lining structure and drainage system. Among them, a prominent problem caused by the latter is that the karst groundwater entrains rock debris to precipitate and cryst...

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Problems solved by technology

However, none of the above studies involved the research on the tunnel drainage system blocked by karst crystals, and the corresponding treatment methods are all remedial methods after the tunnel structure is seriously damaged, and early prevention and treatment of diseases have not been carried out, so the plugging of karst crystals is carried out The research on the cleaning and dredging technology of the drainage system has important scientific significance and engineering value for solving such diseases