A protective treatment method for karst caves at the top of tunnels

Abstract

The invention particularly relates to a protection and treatment method for a tunnel top karst cave. The protection and treatment method includes the steps that (a) an oversized spring type steel reinforcement framework molded through winding is filled with plastic foams; (b) steel arches are distributed under the exposed karst cave in the tunnel cross section mode; (c) the foam spring type steel reinforcement framework which is well fixed is erected to be lifted into a cavity, oversized springs are arranged in a quincunx shape and are fixedly connected with the steel arches in the step (b); (d) fake tops are constructed with the steel arches as inner liners; (f) grouting holes are formed in the fake tops, luokexiu foams are injected into the cavity through the grouting holes, steel reinforcement foams previously placed into the cavity are bonded and reinforced, and original gaps are packed. The protection and treatment method is suitable for treatment of the tunnel underneath pass karst cave; harms of disasters such as stone falling and karstic water in the karst cave on the tunnel construction period and the operation period can be prevented, and the method has the advantages of being high in reliability, easy and convenient to construct, low in construction cost, favorable for stabilization of the overall structure of the karst cave, suitable for the large karst cave, better in treatment effect and the like.

Description

technical field [0001] The invention relates to an on-site construction technology for protection and treatment of karst caves at the top of tunnels, and belongs to the field of tunnels and underground engineering. Background technique [0002] Human beings will vigorously develop underground space in the 21st century. Railway and highway traffic projects, hydropower projects, and various mining projects are inseparable from the construction of a large number of tunnels and tunnels. Because tunnels and tunnels are located in various complex hydrogeological rock masses underground, various karst problems have become the most difficult problems to deal with in the construction of tunnels and other underground projects, among which the protection and treatment of karst caves at the top of tunnels is particularly difficult. [0003] At present, some of the treatment methods for tunnels passing through karst caves are time-consuming and laborious to operate, which affects the co...

AI Technical Summary

Problems solved by technology

[0003] At present, some of the treatment methods for tunnels passing through karst caves are time-consuming and laborious to operate, which affects the construction period, and some only pay attention to the protection of tunnel lining, ignoring the treatment of karst caves

Improper handling of exposed or hidden karst caves will often bring various disasters to the use of the tunnel during the construction period and operation period. The progress of the project threatens the safety of construction personnel and mechanical equipment; during the operation period, if the treatment measures are not appropriate, it will lead to the deterioration of the environment, the decline of the groundwater level, the reduction of vegetation, the loss of surface sand and soil, ground subsidence and other follow-up disasters

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