Micro-crack silica sol double-liquid grouting method

A technology of two-liquid grouting and silica sol, which is applied in construction, infrastructure engineering, etc., can solve the problems of inability to meet the requirements of micro-crack geological anti-seepage and plugging, meet the requirements of anti-seepage and plugging, reduce construction costs, and speed up construction The effect of progress

Active Publication Date: 2020-12-29
SINOHYDRO FOUND ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing grouting method cannot meet the geological anti-seepage and plugging requirements of micro-cracks, the present invention provides a silica sol two-liquid grouting method for micro-cracks using silica sol grouting materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the first stage, slow grouting is used, the ratio of component A solution to component B solution is 1:1; the grouting pressure is 0MPa, the injection rate is 15-20L / min, and the gelling time is 50min; When the grouting volume reaches 25L and the total grouting volume of the 3m section reaches 35L, enter the second stage.

[0037] In the second stage, slow grouting is used, the ratio of component A solution to component B solution is 1:1; the grouting pressure is 1.0MPa, the initial injection rate is controlled at 10-15L / min, and the gelation time is 50min; When the rate reaches 3L / min, enter the third stage.

[0038] In the third stage, fast grout is used, the ratio of component A solution to component B solution is 1:1; the grouting pressure is 2.0MPa, the initial injection rate is 3-8L / min, and the gelation time is 10min; when the fast grout When the injection rate is less than 1L / min, continue to infuse for 30 minutes. When the gelation time is reached, stop the...

Embodiment 2

[0040] In the first stage, slow grouting is used, the ratio of component A solution to component B solution is 1:1.5; the grouting pressure is 1.0MPa, the injection rate is 25-30L / min, and the gelling time is 30min; The total grouting volume reaches 40L, and when the total grouting volume reaches 50L for the 3m section, enter the second stage.

[0041] In the second stage, slow grouting is used, the ratio of component A solution to component B solution is 1:1.5; the grouting pressure is 3.0MPa, the initial injection rate is controlled at 20-25L / min, and the gelation time is 30min; When the rate reaches 10L / min, enter the third stage.

[0042] In the third stage, fast grout is used, the ratio of component A solution to component B solution is 1:2; the grouting pressure is 3.5MPa, the initial injection rate is 5-10L / min, and the gelation time is 5min; when the fast grout When the injection rate is less than 1L / min, continue pouring for 30 minutes or when the gelation time is re...

Embodiment 3

[0044] In the first stage, slow grouting is used, the ratio of component A solution to component B solution is 1:1.2; the grouting pressure is 0.5MPa, the injection rate is 20-25L / min, and the gelling time is 40min; When the total grouting volume reaches 30L and the total grouting volume reaches 45L for the 3m section, it will enter the second stage.

[0045] In the second stage, slow grouting is used, the ratio of component A solution to component B solution is 1:1.2; the grouting pressure is 2.0MPa, the initial injection rate is controlled at 15-20L / min, and the gelation time is 40min; When the rate reaches 5L / min, enter the third stage.

[0046] In the third stage, fast grout is used, the ratio of component A solution to component B solution is 1:2; the grouting pressure is 0.5MPa, the initial injection rate is 5-10L / min, and the gelation time is 15min; when the fast grout When the injection rate is less than 1L / min, continue pouring for 30 minutes or when the gelation tim...

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Abstract

The invention discloses a micro-crack silica sol double-liquid grouting method. In the grouting operation, an A component solution and a B component solution enter the hole bottom through an inner pipe and an outer pipe of a double-liquid plug according to a volume ratio to be mixed; in the first stage of slow grouting, the grouting pressure ranges from 0 MPa to 1.0 MPa, and the injection rate iscontrolled to range from 15 L / min to 30 L / min; and in the second stage of slow grouting, the grouting pressure ranges from 1.0 MPa to 3.0 MPa, the initial injection rate is controlled to range from 10L / min to 25 L / min, when the injection rate reaches 3-10 L / min, operation enters the third stage of fast grouting, the grouting pressure ranges from 0.5 MPa to 3.5 MPa, the initial injection rate ranges from 3 L / min to 15 L / min, when fast grouting reaches gelling time, grouting is ended, and meanwhile a grout inlet valve is closed for grout closing under pressure. The method has the beneficial effects that the process is reasonable, and the problem that micro-crack grouting is difficult under special geological conditions is solved; the grouting effect is good, and the anti-seepage and leakage-stopping requirements can be met; and the construction progress is accelerated and the construction cost is reduced.

Description

technical field [0001] The invention relates to a micro-crack grouting method, in particular to a micro-crack silica sol two-liquid grouting method, which belongs to the technical field of hydraulic construction. Background technique [0002] The problem of micro-crack formation grouting is a major technical problem in the construction of hydraulic structures. At present, the grouting materials that can be used to fill micro-cracks in the formation mainly include cement slurry materials and chemical slurry materials; the main grouting methods include high-pressure grouting and blasting. Grouting, electroosmotic grouting, etc. [0003] When the geological exploration data show that the geological conditions of the grouting construction area are complex and most of the strata are fine cracks, such as: the stratum is extremely broken, the water inflow is large (mostly 150L / min), the water permeability is less than 1Lu, and it is at the intersection of multi-layer fault zones H...

Claims

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Application Information

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IPC IPC(8): E02D15/02
CPCE02D15/02
Inventor 杨振甲李辉龙屈恩才王辉吴杨陈方平陈杰韩用伟李旭鹏杜庆武孙朝亮杨国宁姜哲
Owner SINOHYDRO FOUND ENG
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