Water delivery tunnel whole-section one-time blasting forming construction method

Abstract

The invention discloses a water delivery tunnel whole-section one-time blasting forming construction method. The water delivery tunnel whole-section one-time blasting forming construction method comprises following steps that firstly, a blasting center hole, a breaking-in hole, an auxiliary hole, a periphery hole and a bottom plate hole are determined in the face of a tunnel, and drilling is carried out on the corresponding position; secondly, an ammonium nitrate fuel oil mixture is loaded in blast holes of the breaking-in hole and the auxiliary hole, a continuous coupling charging structure is adopted, hydrogel explosive is arranged in blast holes of the periphery hole and the bottom plate hole, and a continuous non-coupling charging structure is adopted; thirdly, explosive non-electric millisecond detonators are connected to form a blast network, and connected to the position outside the holes, and blasting excavation is achieved. The ammonium nitrate fuel oil mixture is adopted to serve as main blasting explosive, the hydrogel explosive serves as the auxiliary detonating explosive, in combination with the non-electric millisecond detonators, the blasting sequence is strictly controlled, the blasting effect and the construction proceed are improved, combination of the ammonium nitrate fuel oil mixture and the hydrogel explosive is adopted, the cost of each meter of a footageblasting device is reduced obviously, and the blasting cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of tunnel blasting, and in particular relates to a construction method for forming the whole section of a water conveyance tunnel by blasting at one time. Background technique [0002] At present, the explosives used in the construction method of tunnel blasting mainly include emulsion explosives, ammonium nitrate explosives and hydrogel, etc., especially emulsion explosives, which are the most commonly used explosives in tunnel blasting. This type of explosive is used in all However, for Class I surrounding rocks with relatively complete rock mass (weakly weathered), hard rock, and undeveloped joints, the use of a single emulsion explosive has disadvantages such as poor blasting effect, short footage, low work efficiency, and high cost, such as In the tunnel blasting project in Sri Lanka (mainly Class I surrounding rock), local emulsion explosives are used, and the average footage per cycle is only 0.4m, and the bla...

AI Technical Summary

Problems solved by technology

However, for Class I surrounding rocks with relatively complete rock mass (weakly weathered), hard rock, and undeveloped joints, the use of a single emulsion explosive has defects such as poor blasting effect, short footage, low work efficiency, and high cost, such as In the tunnel blasting project in Sri Lanka (mainly Class I surrounding rock), local emulsion explosives are used, and the average footage per cycle is only 0.4m, and the blast hole utilization rate is only 25%; and the cost of blasting equipment for each cycle footage needs to be 3500 , the blasting cost per meter reached 8750 yuan

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