A Blasting Construction Method for Large-diameter Vertical Shaft in Deep Alluvial Layer in Frozen Soil

Abstract

The present invention provides a construction method for blasting frozen soil of large-diameter shafts in deep alluvial layers. The construction method includes the following steps: step S1, the shaft is constructed by freezing method; according to the design range of shaft excavation diameter, two circles of cutting holes are excavated from the inside to the outside , four circles of auxiliary holes and one circle of peripheral holes; the four circles of auxiliary holes are successively auxiliary holes three, auxiliary holes four, auxiliary holes five and auxiliary holes six from the inside to the outside, and one circle of peripheral holes is peripheral hole seven; step S2, drilling After the hole is formed, use a high-pressure air gun to clear the hole; step S3, fill the cutout hole, auxiliary hole and peripheral holes from the bottom of the hole to the hole opening and fill the energy-concentrating tube and loess blasting clay in sequence. The loess clay is filled with water clay, and the outer peripheral surface of the energy gathering tube is provided with a slit along the axial direction, the length of the slit is less than the axial length of the energy gathering tube, and the slit is far away from the axial ends of the energy gathering tube; Step S4 , detonate the cut hole, the auxiliary hole, and the peripheral hole sequentially from the inside to the outside.

Description

technical field [0001] The invention belongs to the technical field of blasting in frozen soil, and in particular relates to a blasting construction method in deep and thick alluvial layer and large-diameter shaft in frozen soil. Background technique [0002] With the widespread use of shaft freezing method, more stringent requirements are put forward for blasting technology in frozen soil. Because the frozen drilling and blasting method has the characteristics of flexibility, simplicity, less consumption, and much greater adaptability to complex underground conditions, it has achieved good results in actual engineering, so frozen soil blasting technology is the focus of current research. [0003] Taking the westerly shaft of Zhaogu No. 2 Mine as an example, the thickness of the alluvial layer in the westerly shaft of Zhaogu No. 2 Mine is 704.6m, of which the surface soil thickness of the clay layer reaches 620m. , excavation section 78.5m 2 , set a circle of cut holes, th...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a deep alluvium blasting construction method for large-diameter shafts in permafrost, to at least solve the problems of the current blasting construction method in permafrost with a long construction period.

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