Backfilling treatment construction method for tunnel high crossing giant salt cavern

Abstract

The invention discloses a backfilling treatment construction method for a tunnel high crossing giant salt cavern. The bottom of a karst cave is processed; the karst cave is subjected to backfilling treatment through a construction guide hole, the karst cave is filled to a height which is flush with the level of the construction guide hole, and a layer of grout stop plate is constructed; backfill is dumped from hole entrances of two sides of a tunnel main hole and an entrance of pilot heading in the cave, and the backfill is back-filled to the bottom elevation of a main hole entrance; groutingand subsidence reducing are conducted on the backfill, and standing is conducted for a while after grouting; the top of the backfill is subjected to the construction of a cement graded crushed rock layer; after the construction completion of the graded crushed rock layer, drilling holes are formed in the karst cave backfill and bottom deposit settlement monitoring points, settlement monitoring isstarted, and standing is conducted for a period of time until monitoring data shows the settlement is stable; after monitoring shows that the settlement is stable and design requirements are met, a concrete road substrate is started to be constructed, large side walls are constructed on both sides of the concrete road substrate, outer karst caves of the large side walls continue to be back-filledby ordinary hole ballasts, an inner side is constructed as a tunnel open cut tunnel structure, and the entire karst cave process is completed.

Description

technical field [0001] The invention belongs to the field of karst cave treatment, and in particular relates to a backfill treatment construction method for a tunnel passing through a giant karst cavity at a high position. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] With the development of tunnel construction technology, the construction is faced with a variety of complex topography and landforms, especially in the tunnels built in Southwest China, where large karst caves are often exposed. Most of the existing karst cave treatment technologies are aimed at small and medium-sized karst caves, and there is currently a lack of mature construction treatment methods for the large-scale karst caves that pass through high-level tunnels; the existing large-scale karst cave backfills mostly use the method of pouring concrete, which is very expensive. ...

AI Technical Summary

Problems solved by technology

Most of the existing karst cave treatment technologies are aimed at small and medium-sized karst caves, and there is currently a lack of mature construction treatment methods for the large-scale karst caves that pass through high-level tunnels; the existing large-scale karst cave backfills mostly use the method of pouring concrete, which is very expensive. high, and it is prone to hydration heat to cause concrete cracking; in the existing giant karst cave backfilling treatment technology, there is no good combination of karst cave backfilling and settlement monitoring, and there is a lack of feedback information to guide backfilling construction

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