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High-pressure combined washing grouting method and structure in karst region

A technology in karst and regional areas, applied in the direction of infrastructure engineering, construction, etc., to achieve a significant flushing effect, reduce the waste of grouting raw materials, and ensure the quality of grouting

Active Publication Date: 2015-05-06
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a high-pressure combined flushing and grouting method in karst areas to solve the problem of engineering anti-seepage grouting in karst areas in the prior art

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  • High-pressure combined washing grouting method and structure in karst region

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Embodiment 1

[0020] Embodiment 1: The present invention is applied to a large-scale filled karst cave: the filling of the karst cave is mainly clay, clay mixed with sand, etc., and the hole depth is 45m to 67m. During the grouting process, the grouting pressure is difficult to meet the design requirement of 3.5MPa, and the multi-hole refilling has not yet reached the design requirement. After adopting the construction of the invention, the design requirements are met through inspection.

Embodiment 2

[0021] Embodiment 2: The present invention is applied to the situation where the engineering curtain grouting test area is in a strong corrosion zone: in this case, the karst cave fillings are mainly sand and yellow mud. The top-down layered high-pressure flushing method is adopted, that is, after drilling into the karst cave, the length of the section is based on the principle that the hole can be formed, and then high-pressure flushing (controlling the pressure at 4-7MPa), and then grouting after flushing until the hole returns to clean water (with Cement slurry is mainly poured. After a large amount of slurry is poured and a certain amount of slurry is poured, it can be mixed with water glass and other admixtures in proportion, and then cement slurry is poured. At the end, cement-water glass slurry is poured), and it will be set after reaching the limit standard ( The waiting time is generally 24h ~ 72h), shorten the length of the section when sweeping the hole, the hole dep...

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Abstract

The invention discloses a high-pressure combined washing grouting method and structure in a karst region. When a filling-type karst cave or a grike exists in the grouting process, high-pressure water or wind flushes filler out, then cement mortar or cement paste of 0.5:1 is refilled, and a common cement grouting method is adopted for grouting 24-72 hours later after condensation. The high-pressure combined washing grouting method is an economical and efficient grouting processing technology specific to karst caves, grikes and the other geological flaw sections, and has the advantages of being simple (not needing special construction equipment and operators), obvious in washing effect, capable of largely improving construction efficiency and guaranteeing grouting quality, and the like. When the high-pressure combined washing grouting method and structure are used for grouting washing and grouting in the karst caves, grikes and the other geological flaw sections in the karst region, the design requirements can be met effectively and rapidly, the construction efficiency can be largely improved, and waste of grouting raw materials is reduced.

Description

technical field [0001] The invention relates to a karst karst geological treatment method, in particular to a high-pressure combined flushing and grouting method in a karst area and its structure. Background technique [0002] Karst terrain refers to the general term for the surface and underground forms formed by the dissolution of soluble rocks by water with dissolution power. The main action of water is dissolution, which also includes mechanical erosion processes such as flowing water erosion, shallow erosion, and subsidence. [0003] In the anti-seepage grouting process of water conservancy and hydropower projects in karst areas, filling caves or dissolution cracks, or strong corrosion areas are often encountered, and the fillings are mostly clay and sandy clay, which cannot be achieved by conventional flushing and grouting methods. Design requirements, and affect the anti-seepage effect. [0004] According to the requirements of the current specification (DL / T5148-20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/16E02D15/00
CPCE02D15/02E02D19/16
Inventor 屈昌华郭维祥余波朱代强昝廷东
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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