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Karst grouting reinforcement method near existing ballastless track roadbed

A subgrade and karst technology, applied in the field of geotechnical engineering, can solve problems such as threats to the safe operation of high-speed trains, aggravated track irregularities, and overhanging deformation of the covering layer, achieving the effects of convenient implementation, avoiding overhanging deformation, and clear processes

Active Publication Date: 2018-12-21
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If grouting is used to strengthen the basement karst of new buildings, the grout can easily enter the basement karst of the existing ballastless track subgrade through the crack channel. The arching pressure causes the overburden and its top subgrade to produce an upward arching deformation, causing track irregularity to aggravate and threatening the safe operation of high-speed trains
It can be seen that the current technical deficiency is how to control the karst grouting pressure adjacent to the existing ballastless track subgrade, and it is urgent to propose a reasonable grouting reinforcement method

Method used

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  • Karst grouting reinforcement method near existing ballastless track roadbed
  • Karst grouting reinforcement method near existing ballastless track roadbed
  • Karst grouting reinforcement method near existing ballastless track roadbed

Examples

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Embodiment

[0036] refer to figure 1 A ballastless track high-speed railway subgrade was built in a karst area, and the subgrade was filled with a height of 1.6m. There may be hidden karst at the S base of the existing ballastless track subgrade. Now a new building needs to be built next to the subgrade, and the base of the building is explored. In the karst development area, it is planned to use grouting for karst reinforcement, and the amount of grouting Q is 100m 3 , r c The radius of the grouting pipe is 0.025m. The initial kinematic viscosity of slurry μ 0 for 10 -6 kpa.

[0037] In order to prevent the existing ballastless track subgrade S from being arched due to karst grouting reinforcement, the method of the present invention is used to determine the grouting reinforcement method for the newly built building X basement karst 3 adjacent to the existing ballastless track subgrade S. The specific steps are as follows:

[0038] 1. Determine the vertical distance h between the ba...

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Abstract

The invention discloses a karst grouting reinforcement method near an existing ballastless track roadbed; and the newly built building substrate karst grouting reinforcement near the existing ballastless track roadbed is scientifically and reasonably performed to effectively prevent the upwarp deformation of the ballastless track roadbed. The method comprises the following steps: (1) related parameters are determined through data collection or a high-density electrical method or a ground penetrating radar or an earthquake reflecting method or electromagnetic wave CT; (2) the weight gamma d andthe internal friction angle FORMULA of a substrate karst top covering layer of the existing roadbed are determined through scene investigation or data collection or drilling sampling or indoor geotechnical tests; (3) the grouting pressure omega z of the newly built building substrate karst is determined through calculation; and (4) the newly built building substrate is drilled to a karst distribution area; and the grouting reinforcement is performed according to the grouting pressure not higher than the grouting pressure omega z determined in the step (3).

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a karst grouting reinforcement method adjacent to the existing ballastless track subgrade. technical background [0002] With the rapid development of high-speed railway, ballastless track subgrade has been widely used. In engineering construction, new buildings or structures will inevitably be built adjacent to the existing ballastless track subgrade. In karst areas, grouting is widely used to strengthen the karst at the base of new buildings, but hidden karst may exist in the existing ballastless track subgrade base adjacent to it. If grouting is used to strengthen the basement karst of new buildings, the grout can easily enter the basement karst of the existing ballastless track subgrade through the crack channel. The arching pressure causes the overburden and its top subgrade to produce an upward arching deformation, causing track irregularity to aggravate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D15/02E01C3/04
CPCE01C3/04E02D15/02
Inventor 陈伟志张耀郭在旭刘勇李高明李安洪李楚根姚裕春吴沛沛李震刘剑光李尧高继涛张敏谭曦
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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