Static blasting construction method for highway tunnel

Abstract

The invention discloses a static blasting construction method for a high-ground-stress soft-rock highway tunnel. The method comprises the steps of establishing of a tunnel excavation mode: a three-step method is used for excavation when surrounding rock is at the V level, and an upper and down step method is used for excavation when the surrounding rock is at the IV and III levels; cut hole construction: a diamond cutting mode and a wedge cutting mode are used for cutting holes according to different levels of the surrounding rock; rock breaking through splitting of a hydraulic splitter to form an excavation free face: the hydraulic rock splitter is used for splitting rock along a cut hole after construction of the cut hole to form the excavation free face for the next step; construction of an auxiliary hole and periphery holes of an upper step; construction of an auxiliary hole and periphery holes of a lower (middle) step; static blasting and de-slagging and hole periphery trimming; and circulation operation. According to the static blasting construction method, the rock breaking capacity and the rock breaking efficiency are high, high adaptability is provided for different surrounding rock, the technology can be implemented easily, the construction is safe and reliable, and the method is particularly applicable to highway tunnels with special construction requirements.

Description

technical field [0001] The invention relates to the technical field of road tunnel construction, and more particularly relates to a static blasting construction method for a road tunnel. Background technique [0002] With the development of my country's transportation construction, more and more road lines are closely intersecting and passing through existing traffic projects and residential buildings. Some road tunnels are close to cities and densely populated areas. The use of conventional drilling and blasting technology will seriously threaten The safety of adjacent buildings will affect the production and life of residents. For example, the exit end of the Longxiang Tunnel of the newly-built Dali Expressway is a densely populated area with many civil buildings, and the tunnel crosses the railway tunnel below at close distance, and the entrance is on an unstable slope. In order to ensure the safety of the surrounding buildings and the slope of the entrance, The tunnel de...

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Problems solved by technology

[0002] With the development of my country's transportation construction, more and more road lines are closely intersecting and passing through existing traffic projects and residential buildings. Some road tunnels are close to cities and densely populated areas. The use of conventional drilling and blasting technology will seriously threaten The safety of adjacent buildings affects the production and life of residents

For example, the exit end of the Longxiang Tunnel of the newly-built Dali Expressway is a densely populated area with many civil buildings, and the tunnel crosses the railway tunnel below at close distance, and the entrance is on an unstable slope. In order to ensure the safety of the surrounding buildings and the slope of the entrance, The tunnel design cannot be excavated by the conventional drilling and blasting method. Therefore, the excavation machine and manual excavation are used in the tunnel, and the progress is very slow. When encountering hard boulders or large hard sandstones, the digging will not work, resulting in construction stagnation. The footage is only 18m, which seriously affects the construction period and increases the construction cost

The current static blasting technology for tunnels generally has problems such as low rock-breaking ability, poor construction safety, low efficiency, and inability to meet the requirements of engineering construction.

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