Tunnel inclined shaft construction method for V-grade surrounding rock soil

Abstract

The invention provides a tunnel inclined shaft construction method for V-grade surrounding rock soil. The tunnel inclined shaft construction method comprises the following steps of excavating a waterintercepting gutter of an inclined shaft hole, carrying out inclined shaft side slope protection, and excavating an inclined shaft hole body. The step of excavating the inclined shaft hole body comprises the following specific steps: carrying out arch wall construction at the hole; excavating a hole section, wherein the hole section is used for ensuring the construction safety and the quality of the arch wall, the deformation amount is reserved to be 10-15 cm during excavation, a short step method is adopted for the hole section, manual mechanical excavation is utilized, the circulating footage is controlled to be the distance of one arch frame, the short footage principle is followed for a V-grade surrounding rock reinforced molded lining section, and excavation is conducted through weakening loosening blasting, and the blast hole depth and the explosive quantity are strictly controlled in the excavation process when stone is encountered; and after excavation, carrying out top finding, spraying bottom layer concrete firstly, then constructing anchor rods, advanced small guide pipe supports and erecting steel frames, and finally spraying concrete again to the designed thickness. According to the method, the situation that the quality of the hole is affected due to the fact that loose or broken soil falls greatly after being excavated can be effectively avoided.

Description

Technical field [0001] The present invention relates to the field of tunnel construction, in particular it relates to a method of tunnel construction Shaft Ⅴ grade of soil surrounding rock. Background technique [0002] Tunnel structure includes a main building and ancillary equipment in two parts. The main building of the hole body composition and portal, ancillary equipment including lay-hole, fire-fighting facilities, emergency communications and waterproofing and drainage facilities, long tunnel ventilation and lighting as well as specialized equipment. With the demands for improvement and economic development of the construction project level, because the tunnel has the advantage of crossing the mountains, for vehicular travel and reduce travel distance, more and more need for excavation of tunnels in the mountains. Hilly mountain tunnel hole has been the most complex in tunnel construction conditions, the highest part of the security risk. Conventional tunnel entrance is th...

AI Technical Summary

Problems solved by technology

However, there is currently no tunnel construction method for grade V surrounding rock and soil in the market, and grade V surrounding rock and soil have the following characteristics: hard rock and relatively hard rock, broken rock mass, poor joint surface, soft rock: well-developed structural plane , Fragmented structure or loose structure, average or poor bonding, very soft rock (Rb=0-5Mpa), structural planes are not developed or structural planes are relatively developed, but the bonding surface is good

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