Treatment and construction process for tunnel to pass through super-huge karst cave with water cavity

Abstract

The invention discloses a treatment and construction process for a tunnel to pass through a super-huge karst cave with a water cavity. The treatment and construction process includes the steps that firstly, the top of the karst cave is protected; secondly, karst cave operating personnel transport devices for construction; thirdly, escape channels are arranged; fourthly, a karst cave water outlet retaining wall is constructed; sixthly, roadbed filling is carried out; seventhly, a drainage system is established; eighthly, a transverse drainage tunnel is constructed and drained to a drainage drainage tunnel communicating with the outside world; ninthly, backfilling body settlement monitoring is conducted; tenthly, after roadbed filling is completed, compaction and pre-compaction are carried out; eleventhly, preliminary bracing construction of the karst cave top begins; twelfthly, steel bar concrete strip foundations are constructed; thirteenthly, an open tunnel lining is constructed, anda light weight foam concrete buffer layer is filled between the top of the karst cave and the outer side of the lining; and fourteenthly, backfilling body settlement monitoring is conducted. The technical problems of complicated construction processes, long construction time, large disturbance to surrounding rock construction, cross construction and monitoring measurement of existing tunnels passing through super-huge karst caves can be systematically solved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a treatment and construction process for a tunnel passing through an extra-large karst cave with a water cavity. Background technique [0002] When the tunnel passes through the karst area, it may encounter large karst caves, underground rivers or pipeline flows. Such geology has a certain impact on the overall stability of the surrounding rock and stress distribution and release. The engineering method with small disturbance to the surrounding rock structure of the karst cave and fast construction is particularly important. [0003] By reviewing relevant literature and patents, it is found that during the excavation of long tunnels, it is rare to directly pass through super-large water-cavity caves with a span of 34 meters and a depth of more than 38 meters, and the cave roof is higher than the tunnel roof. Some methods for the treatment of tunnels passi...

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