A construction method of curtain grouting in strata with strong karst development

Abstract

The invention belongs to the field of water and hydropower construction projects and particularly relates to a strong karst development stratum curtain grouting construction method. According to the construction method, the high pressure washing replacement technological innovation technology is adopted in the construction process, the technical problem of pore-forming of deep-layer karst development stratum curtain grouting is solved, and the project can be implemented smoothly; according to different geological conditions, various blending agents and chemical treatment agents are blended into cement grout so that the viscosity, shear force and plastic molding parameters of the grout can be adjusted, certain pouring measures and means are taken, and thus the injection volume and diffusance of the grout are controlled; the optimal grouting effect can be achieved, and unnecessary losses of the grout can be reduced.

Description

technical field [0001] The invention belongs to the field of water conservancy and hydropower construction engineering, and in particular relates to a curtain grouting construction method for strata with strong karst development. Background technique [0002] China has been building dams in karst areas since the 1970s. The construction of water conservancy projects in karst areas faces two major issues. One is to choose applicable, efficient and accurate survey methods to find out the geological conditions of karst projects; Reasonable and technically feasible foundation and foundation treatment methods. Due to the particularity of karst geology - karst caves, karst collapses and complex underground pipe network systems caused by the solubility of carbonates not only increase the difficulty, cost and cycle of geological survey work, but also increase the difficulty and cost of foundation treatment. To deal with the complexity of karst formations, methods such as displacemen...

AI Technical Summary

Problems solved by technology

In the deep layer, because of the high proportion of sand, when using large flow water for flushing, the water flow pressure output by the pump can only bring a very small amount of sand out of the hole, and a large amount of sand remains in the hole, so the hole in the hole after pulling out The sand collapses and cannot form holes

Moreover, when drilling in deep fully-filled karst caves, due to the low water pressure of the cooling water, when the drilling rig drills down, the mud and sand in the hole will enter the drill pipe and block the drill pipe, resulting in the failure of the cooling water to circulate and burning. drill phenomenon

(4) The geological conditions in karst areas are changeable, and karst caves and corrosion cracks are often encountered during the grouting construction process. During the construction process, the main manifestations are drill drop during drilling, accelerated drilling footage, hole collapse, water leakage, Abnormal phenomena such as large injection volume and repeated refilling still unable to reach the end standard during water gushing and grouting

This patent only describes the hole-forming and grouting methods of high-pressure curtain grouting in the covering layer, and does not involve the karst treatment encountered in the treatment of drilling holes, nor the specific grouting treatment methods for different types of karst