Sleeve valve pipe grouting method suitable for deep covering layer permanent curtain

Abstract

The invention provides a sleeve valve pipe grouting method suitable for a deep covering layer permanent curtain. The method includes the following steps that a clamping plug is put in a sleeve valve pipe of a current grouting section; a loop is opened; induction water injection is carried out, wherein after the loop is opened, high-pressure water is continuously injected into the grouting pipe atthe water injection pressure larger than or equal to the induction pressure; when it is judged that the induction water injection state reaches an induction ending condition, induction water injectionends; and grouting is carried out according to the induction water injection condition. The requirements of grouting under complex unknown geological conditions are met, an induction water injectionmethod is adopted, the current geological environment is checked, a grouting passageway is broken through, and then the curtain with enough thickness is formed under the single-row hole condition; andas the sleeve valve pipe is used, repeated grouting can be achieved, overall long-term, safe and stable operation of a dam is facilitated, and meanwhile the requirements of geological condition analysis, opening of the grouting passageway and guiding of selection of slurry are met.

Description

technical field [0001] This application relates to a casing grouting method suitable for permanent curtains with deep overburden. Background technique [0002] Curtain grouting is a grouting project that pours grout into the cracks and pores of rock mass or soil layer to form a continuous water-blocking curtain to reduce seepage and seepage pressure. [0003] Curtain grouting is the construction of anti-seepage curtain by grouting in the rock or gravel foundation of the dam. The top of the curtain is connected with the concrete gate floor or the dam body, and the bottom is penetrated to a certain depth in the relatively impermeable rock layer to prevent or reduce the penetration of groundwater in the foundation; it works together with the drainage system located downstream to reduce the lift of the seepage water flow on the gate dam. pressure. [0004] For projects that have been constructed with concrete cutoff walls or grouted, when curtain re-irrigation is required due ...

AI Technical Summary

Problems solved by technology

Therefore, ordinary grouting methods cannot meet the grouting requirements of the above-mentioned supplementary irrigation projects, especially under high head, dynamic water conditions, deep overburden, permanent curtain, controlled grouting and other difficult conditions, the resistance formed by conventional grouting methods The water curtain has poor water blocking effect and reliability, and cannot solve the problem of water gushing and sand gushing

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