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A test device and evaluation method for horizontal grouting of highway subgrade

A test method and test device technology, applied in the direction of measuring devices, flow characteristics, instruments, etc., can solve the problem of complex filling, large manpower and material resources, and no corresponding evaluation methods and indicators for the injectability effect of grouting materials and reinforcement effect, etc. problems, to achieve the effect of reducing project cost, simple structure, and demonstrating feasibility

Active Publication Date: 2022-05-31
CHANGAN UNIV +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The filling soil in the subgrade is complex, and the pores and cracks are much smaller than the rock cracks. There are no corresponding evaluation methods and indicators for the injectability and reinforcement effects of grouting materials
If on-site construction equipment is used for grouting injectability test, it will cost a lot of manpower and material resources

Method used

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  • A test device and evaluation method for horizontal grouting of highway subgrade
  • A test device and evaluation method for horizontal grouting of highway subgrade
  • A test device and evaluation method for horizontal grouting of highway subgrade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The pneumatic grouting pump 6 provides power support for the grouting test, and the grouting pressure gauge 10 is installed above the pneumatic grouting pump 6.

[0061] For the diffusion radius test: as shown in Figure 6, using a disk-shaped grouting sand disk;

[0066] When r≥R, the grout outlet of the grouting disc had grout seeping out, indicating that the grout had good grouting in this soil sample stratum;

[0067] The sand filler in the grouting sand pipe and the grouting sand tray refers to the following table. According to the injectability test, it is determined that the grout is injectable

[0069]

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Abstract

The invention discloses a test device and evaluation method for the injectability of horizontal grouting of highway subgrade. The grouting device is used to inject slurry into the grouting flower pipe arranged horizontally in the test grouting box, and the grouting flower pipe and the test grouting box The other spaces inside the body constitute the sand filling area, and the sand filling to be tested is filled in to simulate the formation of the subgrade structure. The pipe wall is uniformly provided with a plurality of grouting through holes, and the slurry enters the sand filling layer along the grouting holes, thereby realizing the simulation of the injectability of the slurry along the sand filling layer. This device has a simple structure and can Realize the preparation, pumping and grouting simulation of grouting materials, through the grouting sand tube and grouting sand table test on the grouting ability, obtain the seepage parameter index, and reflect the grouting effect in the test soil sample formation through the index Injectability analysis to effectively demonstrate the feasibility of subgrade grouting operations.

Description

A test device and evaluation method for horizontal grouting injectability of highway subgrade technical field The present invention relates to a kind of highway subgrade treatment grouting reinforcement construction field, be specifically related to a kind of highway subgrade horizontal injection Slurry castability test device and evaluation method. Background technique [0002] With the continuous increase in the traffic volume of the expressway, obvious settlement of the roadbed occurs in some places with poor geology, thereby Cause different degrees of subsidence of the pavement, especially the soft soil foundation in coastal areas, so the poor geological subsidence is effectively controlled, and the foundation is improved. Effective consolidation is extremely important. Among them, hydrostatic osmosis grouting is the main technical means to deal with the subsidence of highway subgrade. Currently The continuous development of grouting materials, grouting materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00
Inventor 张争奇李艳军李乃强徐玉峰唐亨山桂增俭田中男许铖程根源常庆喜崔杰吴金波马丽霞程小纯张津航李浩
Owner CHANGAN UNIV
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