Reinforcement system and construction method of cross-tensioned anchor bolts in parallel tunnels with complex geology and small clear distance
A technology for pulling anchor rods and complex geology, which is applied in the field of traffic engineering to achieve the effects of good popularization and application value, scientific and reasonable structure, and simple and easy construction.
Active Publication Date: 2016-04-27
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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[0005] The purpose of the present invention is to provide a parallel bolt reinforcement system and its construction method for parallel tunnels with complex geology and small clear distance, so as to solve the structural stability problem of parallel tunnels with small clear distance in complex geology
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[0035] The present invention will be described in detail below in combination with specific embodiments.
[0036] see figure 1 In the process of the two parallel tunnels of the bell-mouth structure gradually approaching, the structural stability performance varies greatly under different geological conditions. When the geological surrounding rock is good, zero-space parallel construction can be achieved without major problems, but if the geology is complex, Especially in the high ground stress soft rock section, the construction of the left and right lines has a great influence on each other.
[0037] The anti-bolt reinforcement system of the small clear distance parallel tunnel in complex geology involved in the present invention is suitable for the construction of the small clear distance section of the bell mouth parallel tunnel. The closed initial support steel frame is sprayed with concrete for initial support. The initial support steel frame consists of the initial supp...
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The invention relates to a complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and a construction method of the reinforcing system. In the gradual closing process of two parallel tunnels of a bell mouth structure of a complex geological region, structural stability is low. In two lane tunnels of the small-clear-distance segments of the parallel tunnels of the bell mouth structure, a plurality of closed initial supporting steel frames are arranged, and concrete is sprayed for initial support. A plurality of cross anchor rods which are parallel in the vertical direction are fixed between the initial supporting steel frames of the two lane tunnels and penetrate through surrounding rock. The ends of the cross anchor rods are fixed to the initial supporting steel frames through steel plates and bolts. The cross anchor rods, the steel plates, the bolts and the initial supporting steel frames deform through the surrounding rock and are automatically locked to form a firm whole. For the special surrounding rock, the small-clear-distance segments of the two lane tunnels are provided with cross anchor rod stabilizing middle rock pillars and two sidewall structures, so that overall stress is achieved, and the effect is good; besides, the reinforcing system is scientific and reasonable in structure, easy and convenient to construct and high in practicability, thereby having extremely high application and popularization value.
Description
technical field [0001] The invention belongs to the technical field of traffic engineering, and in particular relates to an anti-bolt reinforcement system and a construction method for parallel tunnels with small clear distance in complex geological conditions. Background technique [0002] In the past, bell-mouth tunnel structures were generally avoided in geologically complex areas. The main consideration was that the bell-mouth tunnel structure would be subjected to complex forces during the construction process. The structure is not just a two-dimensional structure with a long passage. The stress of the structure must undergo multiple conversions to form one or more complex three-dimensional stress states, making it difficult for conventional structures to bear. If the surrounding rock of the tunnel is hard and complete, its good self-bearing capacity can share more surrounding rock load, the support structure can still be stable, or the surrounding rock is relatively so...
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IPC IPC(8): E21D20/00E21D11/00
Inventor 李国良杨木高李雷刘国庆司剑钧李宁徐志平
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP