Karst cave backfilling method and tunnel construction method

Abstract

The invention relates to a karst cave backfilling method and a tunnel construction method. The karst cave backfilling method comprises the following steps that a karst cave is backfilled with lower graded cave ballasts, and grouting reinforcement is conducted on the backfilled lower graded cave ballasts and collapsed bodies and accumulated bodies in the karst cave; first reinforcing plates are constructed on the backfilled lower graded cave ballasts, and concrete foundation structures are constructed on the first reinforcing plates; and the positions between the two sides of the concrete foundation structures and the cave wall of the karst cave are backfilled with inter-plate graded cave ballasts in a graded mode, grouting reinforcement is conducted on the inter-plate graded cave ballasts, second reinforcing plates are arranged between the adjacent inter-plate graded cave ballasts, one end of each second reinforcing plate is connected to the corresponding concrete foundation structure in a lap joint mode, and the other end of each second reinforcing plate supports the cave wall of the karst cave. The backfilling method is low in cost and good in economic efficiency.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a karst cave backfilling method and a tunnel construction method. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] At present, there are more and more tunnel projects passing through the karst formations in mountainous areas. There are giant karst caves in the karst formations of mountainous areas. These caves are huge in volume, with a space of millions of cubic meters, and the construction is extremely difficult. The disposal of giant karst caves is currently lacking maturity. method of construction disposal. [0004] The inventor found that the giant karst caves in alpine tunnels have a large scale of development, complex shapes, poor stability of the roof and walls of the caves, a large thickness of collapsed deposits at the bottom of th...

AI Technical Summary

Problems solved by technology

[0004] The inventor found that the giant karst caves in alpine tunnels have a large scale of development, complex shapes, poor stability of the roof and walls of the caves, and the thickness of the collapsed deposits at the bottom of the karst caves is large. The height difference at the bottom is large, the karst treatment measures and protection during the construction period are difficult, and the construction risk is high

In addition, the existing huge karst cave backfill disposal mostly uses a large number of high-cost construction materials such as concrete engineering or difficult technical processes, and the karst cave disposal is not economical enough

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