Construction method of bilateral biased small-clear distance tunnel

A technology for tunnel construction and construction methods, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as difficulties in ensuring the stability of tunnel surrounding rock and support structures, large deformation disasters in tunnels, and large surface settlement of tunnels, etc., to achieve Compact arrangement of construction steps, reduction of construction disasters, and shortened construction period

CN102128035AInactive Publication Date: 2011-07-20CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-07-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a construction method of a bilateral biased small-clear distance tunnel, which comprises the following steps of: 1) preparing for construction; 2) constructing a tunnel portal; 3) adopting a reserved core soil method to construct tunnel entry portal sections, wherein a biased deep-buried side master cave is firstly constructed, and then, a tunnel shallow-buried side mastercave is constructed; 4) adopting a bench cut method to excavate a middle communication section of the tunnel; and 5) adopting a reserved core soil method to construct tunnel exit portal sections, wherein the distance between heading faces of the left and right caves of the tunnel is controlled to be 20-30m in the construction process from the tunnel entry portal sections to the exit portal sections; and carrying out secondary lining construction on the left and right caves of the tunnel from front to back. The invention has the advantages of reasonable design, compact construction steps and convenient construction process, can effectively control the ground subsidence, the vault settlement of the left and right caves, the inter-cave border convergence and the deformation and stress of themiddle rock pillar, reduces the construction hazard, saves the project cost, ensures the stability of the wall rock of the tunnel and the middle rock pillar, and lowers the construction risk of the bilateral biased small-clear distance tunnel.
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Description

technical field

[0001] The invention relates to the technical field of tunnel engineering, in particular to a construction method for a double-sided biased small clear distance tunnel. Background technique

[0002] my country is a mountainous country. In recent years, with the implementation of national road network construction and the deepening of the western development strategy, a large number of tunnel projects have emerged. When selecting a tunnel, if a separate tunnel is used, the clear distance between the left and right lines of the tunnel is required to be relatively large, and the triangular transition area at the junction of the road or bridge and the tunnel is relatively large, resulting in a large amount of land use. Due to land acquisition conditions or terrain Due to the constraints of the situation, it is necessary to reduce the clear distance between the left and right line tunnels, and the small clear distance tunnel type or the multi-arch tunnel type can ...

Examples

Embodiment

[0044] This embodiment is a certain expressway bilateral bias small clearance tunnel, such as figure 1 shown. The starting and ending mileage of the left line of the tunnel is ZK30+045~ZK30+316, with a length of 271m, of which the V-level surrounding rock is 139m, and the IV-level surrounding rock is 132m; the right line is YK30+050~YK30+315, 265m long, of which V-level The surrounding rock is 137m, and the IV grade surrounding rock is 128m. The maximum buried depth of the tunnel is 60m, and it is a double-sided biased shallow-buried tunnel with a small clear distance. The full length of the tunnel can be divided into the entrance section, the middle connecting section and the exit section. Among them, the entrance and exit sections of the tunnel are strongly weathered gneiss, with low strength, developed joints and fissures, and are weak surrounding rock sections; the connecting section in the middle is weakly weathered gneiss, with good rock mass integrity, which is Stabl...