Supporting structure in initial stage of freezing for tunnel in soft surrounding rock, and construction method

Abstract

The invention discloses a supporting structure in the initial stage of freezing for a tunnel in soft surrounding rock, and a construction method, and belongs to the technical field of tunnel supporting structures. Insulation layers are coated in an upper flange and a lower flange of an arch frame; a refrigeration device is composed of N-type semiconductors, P-type semiconductors and metal gaskets,the metal gaskets are bonded onto the arch frame in a staggered manner, and the N-type semiconductors and the P-type semiconductors are alternately welded onto the intersection positions of the metalgaskets and connected into couple pairs; a heat dissipation device is composed of a communication pipe, heat dissipators, a ventilation pipe and an exhaust pipe, the arch frame with the refrigerationdevice is installed after tunnel excavation, the heat dissipators are distributed at the inner side of the arch frame, and the adjacent arch frames are connected by the communication pipe; and the ventilation pipe is inserted into the arch frame and led to the hole of the tunnel, the exhaust pipe sleeves into the ventilation pipe, and a direct-current power supply is connected with the refrigeration device. According to the supporting structure in the initial stage of freezing for the tunnel in the soft surrounding rock, and the construction method, in the case that a refrigeration system isnot constructed independently and the action of the arch frame is not influenced, a frozen soil shell can be formed on the peripheral surrounding rock of a soft section of the tunnel, water isolationis carried out, the deformation of the tunnel is controlled, the ventilation of the tunnel is improved, and the construction environment is improved.

Description

technical field

[0001] The invention belongs to the technical field of tunnel engineering support structures, in particular to the initial support structure technology for soft surrounding rock tunnel freezing, and is especially suitable for road and railway tunnels passing through weak surrounding rocks. Background technique

[0002] In recent years, large-scale transportation infrastructure such as highways and railways have been constructed in the western mountainous areas, and the number of tunnel projects with extremely complex terrain and geological conditions has continued to increase. Weak surrounding rock is one of the most common engineering geological conditions in extremely complex geological conditions. In the construction of tunnels in western mountainous areas, more and more tunnel projects pass through weak surrounding rock. However, the construction of tunnels in weak surrounding rock has always been a worldwide problem. A large number of engineering practi...

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