Strong karst development stratum curtain grouting construction method

A construction method and curtain grouting technology, applied in the direction of infrastructure engineering, construction, etc., can solve the problems of large injection volume, drilled holes, left in the holes, etc., to achieve the effect of reducing loss

Active Publication Date: 2016-08-24
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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  • Summary
  • Abstract
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  • Claims
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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

Method used

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] The specific construction process of Aikou Reservoir is as follows

[0038] 1. Overall construction process

[0039]Curtain grouting in strata with strong karst development adopts closed orifice, circulation in the hole, and grouting in sections from top to bottom. After the construction of adjacent pre-sequence holes is completed, subsequent holes can be constructed. Construction procedure: Clean up the construction site → measure the hole position → install and accept the construction platform (slope) → align the drilling rig for leveling and anchoring → drill the lifting hole → install the lifting deformation ob...

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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...

Claims

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Application Information

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IPC IPC(8): E02D15/02
CPCE02D15/02
Inventor 潘龙龙宋东旭吕理军严开义李博
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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