Grouting repair method for existing ballastless track subgrade base regenerative hidden karst
A karst and track technology, which is applied in the field of geotechnical engineering, can solve problems such as track irregularities, overhanging deformation, and regeneration of hidden karst collapses, etc., and achieves the effect of convenient implementation, clear process, and avoiding overhanging deformation
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[0034] 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.
[0035] 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:
[0036] 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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