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Method for controlling loss of grouting slurry for karst foundation and pollution of underground water

A groundwater and grouting technology, used in soil protection, infrastructure engineering, construction, etc., can solve the problems of polluted groundwater, fish and shrimp death, etc., and achieve the effect of reducing water separation.

Active Publication Date: 2017-11-24
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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Problems solved by technology

After the cement slurry is injected into the ground, the separated water of the cement slurry carries hexavalent chromium and is strongly alkaline, polluting the groundwater and causing the death of fish and shrimp in the pond near the grouting site

Method used

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Embodiment Construction

[0025] The present invention will be described in detail below in combination with specific embodiments.

[0026] The method for controlling the loss of karst foundation grouting slurry and polluting groundwater involved in the present invention comprises the following steps:

[0027] Step 1: Add cement and water into the iron mixing tank, stir quickly, and configure cement slurry with a conventional water-cement ratio of 1:1;

[0028] Step 2: Add Additive A, Additive B, and Additive C to the iron mixing tank in turn. After adding the three additives, stir quickly for 2 to 3 minutes to complete the configuration of the controllable cement slurry;

[0029] The additive A is a quick-setting agent, which has the effect of accelerating the coagulation of the cement slurry and reducing the water separation of the cement slurry;

[0030] The additive B is a water reducer, which has the effect of increasing the fluidity of the cement slurry;

[0031] The additive C is a water-retai...

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Abstract

The invention relates to a method for controlling loss of grouting slurry for karst foundations and pollution of underground water. Additives A, B and C are added into cement slurry with the conventional water-cement ratio being 1:1, fast stirring is conducted, the controllable cement slurry is prepared, and then slow stirring is conducted at a half speed. Afterwards, the controllable cement slurry is poured into the karst foundations, when a karst cave under the foundations is about to be filled completely, a hole packer is installed at a grouting hole, pressure is applied, the controllable cement slurry continues to be pressed in till grouting of the single hole is completed, and the steps are repeated till grouting of all grouting holes in the area is completed. According to the method, initial setting time of the controllable cement slurry is shortened extremely, the diffusion radius of the cement slurry is reduced greatly, and loss of the cement slurry is controlled. The water segregation rate of the controllable cement slurry is lowered extremely, the water segregation amount of the cement slurry is reduced greatly, and pollution of the underground water due to the cement slurry is controlled. The controllable cement slurry has fluidity not smaller than 200 mm within 10-15 minutes after fully stirred, and the effect that the controllable cement slurry does not block a grouting pipeline is ensured.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment in karst areas, and in particular relates to a method for controlling the loss of karst foundation grouting slurry and polluting groundwater. Background technique [0002] The soluble rocks along the Qianzhangchang Railway are mainly distributed in the section from Qianjiang to Longtan Town, Taoyuan County. The total length of the main line is 132.67km, accounting for 39.09% of the total line length. The karst forms are diverse, and karst valleys, karst depressions, sinkholes, funnels, karst buds, karst troughs, karst caves, underground rivers, and karst springs are all developed. [0003] The karst subgrade of Guizhou-Zhangzhou-Changzhou Railway is about 20km long. The subsidence of karst foundation will directly threaten the safety of railway operation. For this reason, the karst foundation under the railway subgrade base is generally treated with the construction method of "explor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12
Inventor 曹元平孟祥连冯威王应铭李茂春刘卫斌甘传奇王军辉汪浩
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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