Anchor mesh cable column combined supporting design method for expanding extra-large span open-off cut brush into lane

Abstract

The invention discloses an anchor mesh cable column combined supporting design method for expanding an extra-large span open-off cut brush into a lane. The anchor mesh cable column combined supporting design method is characterized in that firstly little section digging is performed according to the shape of an open-off pilot tunnel, then the open-off pilot tunnel is supported by using high strength anchor rods, diamond-shaped metal meshes, steel strip opposite open-off cut top plates and old waste wall and surface extending wall surrounding rock, top plate prestressed anchor cables are arranged on the open-off cut pilot tunnel, each row of anchor cables is provided with a corresponding anchor cable beam, and a row of marguises is constructed nearby the center of the pilot tunnel; secondary brush expansion is performed on the basis of completion of the open-off pilot tunnel, after surface expansion, the top plate anchor rods and the anchor cables adopt a staggered arrangement method before the surface expansion, and quantity of the anchor rods, the anchor cables and the marguises is increased to perform enhancement and supporting. When the extra-large span open-off cut brush is expanded into the lane, the anchor mesh cable column combined supporting design method can effectively control deformation of open-off cut surrounding rock, obtain good safety and economic effects, and guarantee smooth installation of subsequent fully-mechanized coal mining devices.

Description

technical field [0001] The invention relates to a design method for combined support of a brush-extended tunnel with a span of 8 to 10 m and an anchor net, cable column, and more specifically, a design method suitable for segmental excavation with super large sections that is difficult to support and has large deformation of surrounding rocks. The joint support method of the anchor beam net cable column. Background technique [0002] With the improvement of the degree of mechanization of coal mining, in order to meet the installation requirements of large-scale fully mechanized mining equipment, the width of cutting holes in many fully mechanized mining faces is designed to be 8m to 10m. For ultra-large-span tunneling construction, the use of secondary tunneling can effectively control the deformation of surrounding rock, and the quality of tunneling is high to ensure construction safety. Lane method. [0003] The main form of support for the incision in fully mechanized m...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a design method suitable for super-large-span cut-hole brush expansion roadway and anchor net cable column combination support, in order to effectively solve the problem of large deformation of surrounding rock, unstable dynamic pressure coefficient, significant brush expansion stress concentration and equipment Difficult to install

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