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A grouting repair method for regenerating concealed karst at the subgrade base of existing ballastless track

A karst and track technology, applied in the field of geotechnical engineering, can solve the problems of aggravated track irregularity, upper arch deformation, regenerated hidden karst collapse, etc., and achieves the effect of convenient implementation, clear process, and avoiding upper arch deformation.

Active Publication Date: 2020-05-08
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regenerated concealed karst has the risk of collapse, affecting the normal use of the overlying ballastless track subgrade
In this regard, grouting reinforcement can be used to repair the regenerated concealed karst foundation. However, during the grouting process, if the grouting pressure is not properly controlled, the grout pressure of the existing ballastless track subgrade base may cause excessive upturning pressure , causing the regenerated concealed karst overburden and its top subgrade to produce an upward arch deformation, causing track irregularity to increase, and threatening the safe operation of high-speed trains
It can be seen that the current technical deficiency is how to control the grouting pressure of the existing ballastless track subgrade regeneration concealed karst, and it is urgent to propose a reasonable grouting repair method

Method used

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  • A grouting repair method for regenerating concealed karst at the subgrade base of existing ballastless track
  • A grouting repair method for regenerating concealed karst at the subgrade base of existing ballastless track
  • A grouting repair method for regenerating concealed karst at the subgrade base of existing ballastless track

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Embodiment

[0032] refer to figure 1 A ballastless track high-speed railway subgrade was built in a karst area, and the subgrade was filled to a height of 2.0m. The soluble rock at the S base of the existing ballastless track subgrade formed a regenerated concealed karst 1 under the action of water erosion and dissolution, and grouting was required to repair the regenerated concealed Karst 1 foundation.

[0033] In order to avoid karst grouting causing the existing ballastless track subgrade S to produce arching deformation, the method of the present invention is used to determine the grouting repair method of the regenerated concealed karst 1 of the existing ballastless track subgrade S base, and the specific steps are as follows:

[0034] 1. Determine the vertical distance h from the base of the existing ballastless track subgrade S to the center of the regenerated concealed karst 1 as 4.5m by high-density electrical method or ground penetrating radar or seismic reflection method or ele...

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Abstract

The invention discloses a grouting repair method for existing ballastless track subgrade base regenerative hidden karst. Regenerative hidden karst grouting repair is scientifically and reasonably carried out, and upwarp deformation is effectively prevented for ballastless track subgrade. The method comprises the following steps that 1, relevant parameters are determined through a high-density electrical method or ground penetrating radar or a seismic reflection method or electromagnetic wave CT; 2, the unit weight gammad and internal friction angle phid of a covering layer on the top of regenerative hidden karst are determined; 3, grouting pressure sigmaz for grouting repair of regenerative hidden karst is determined through calculation; 4, an inclined hole is drilled in existing ballastless track subgrade slope toe to regenerative hidden karst, and grouting repair is carried out based on the grouting pressure not larger than sigmaz determined in the step 3.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a grouting repair method for regenerating hidden karst at the subgrade base of existing ballastless track. Background technique [0002] With the rapid development of high-speed railway, ballastless track subgrade has been widely used. In the karst area, the soluble rock of the subgrade base of the ballastless track that has been built can easily form a new karst development area under the action of water erosion and dissolution, that is, the regenerated concealed karst. Regenerated concealed karst has the risk of collapse, affecting the normal use of the overlying ballastless track subgrade. In this regard, grouting reinforcement can be used to repair the regenerated concealed karst foundation. However, during the grouting process, if the grouting pressure is not properly controlled, the grout pressure of the existing ballastless track subgrade base may cause e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10E01B2/00
CPCE01B2/00E02D3/10
Inventor 陈伟志向俐蓉刘刚姚裕春刘勇李安洪周成龚建辉曾永红胡会星张志强杨祥容冉令
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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