Pressurized returned grout reinforced covered karst embankment grouting method

Abstract

The invention discloses a pressurized returned grout reinforced covered karst embankment grouting method. The method includes steps: determining a karst area range, depth and karst morphology through engineering geophysical exploration; determining a pilot hole arrangement range, spacing and depth according to the determined karst area range, depth and karst morphology; carrying on a hole forming process on each pilot hole according to reconnaissance standards, and acquiring stratum rock core morphological data in a pilot hole implementation process; determining a grouting scheme according to the karst area range, depth and karst morphology determined according to the acquired rock core morphological data. Aiming at existing railway lines with roadbeds in covered karst development areas, the pressurized returned grout reinforced covered karst embankment grouting method is provided for solving the problem of geological disasters such as roadbed differential settlement, instability and collapse caused by karst dissolution to provide a safety environment for normal operation of the existing railway lines.

Description

technical field [0001] The invention relates to the technical field of grouting technology, in particular to a grouting method for reinforcing covered karst embankments with pressure return grouting, which is the reverse process of karst development. Background technique [0002] Covered karst soluble rock is covered by Quaternary loose deposits, the covering layer is thin, generally less than 30m thick, and the bearing capacity of the subgrade is low. In the operation of existing railway lines, the covered karst subgrade will cause karst collapse under the action of train load and additional load, which poses a great threat to railway safety. [0003] Overlay karst overburden is a dual structure composed of silty clay and sandy soil. There is no filling in the karst caves. Limestone fissures are developed. The fluctuation of the erosion base level makes groundwater flow in the cracks and enhances the dissolution of soluble rocks. Karst The roof is unstable, and the upper r...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a grouting process for reinforcing the covered karst embankment with pressure return grout for the existing railway line foundation located in the covered karst development section, which is used to solve geological disasters such as uneven subsidence, instability, and collapse of the roadbed caused by karst dissolution problems and provide a safe environment for the normal operation of existing railway lines

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