Method for supporting and protecting soft, collapsible and super thick coal seam tunnel based on filling behind support and device thereof

Abstract

The invention discloses a method for supporting and protecting a soft, collapsible and super thick coal seam tunnel based on filling behind a support and a device thereof, relating to the supporting and protecting technology of the coal seam tunnel. The method comprises the following steps of: (1) the tunnel is supported and protected by a sealing retractable U-shaped steel support which consists of a top arch, a side wall and an inverted arch; (2) the inner wall of the side wall is provided with a waist beam; (3) the top arch and the outer wall of the side wall are suspended with a metal mesh; (4) the metal mesh is externally paved with a double resistance cloth; and (5) the outer side of the double resistance cloth is injected with a high-expansion chemical filling material behind the support. The device has the following structure: the waist beam (20), the sealing retractable U-shaped steel support (10), the metal mesh (30), the double resistance cloth (40) and the high-expansion chemical filling material (50) are sequentially connected with each other from the inside to the outside. The invention is suitable for supporting and protecting the super thick, soft and collapsible coal seam tunnel, and the landslide and soft tunnel.

Description

technical field [0001] The invention relates to a coal seam roadway support technology, in particular to a method and a device for supporting a roadway in a soft and easy-to-cause extra-thick coal seam based on backfilling. Background technique [0002] The support of coal seam roadway (referred to as coal roadway) has experienced the development process of wood support, masonry support, section steel support and bolt support. [0003] The support forms of coal roadways adopted at home and abroad mainly include: [0004] 1. U-shaped steel retractable bracket [0005] The U-shaped steel itself has a relatively reasonable cross-sectional geometry and high strength, so the U-shaped steel shrinkable bracket has a large supporting capacity, a large shrinkable amount, and good stability. Its characteristics are basically in line with the activity law of the roadway surrounding rock. However, U-shaped steel supports also have disadvantages. For example, in coal roadways with arc...

AI Technical Summary

Problems solved by technology

However, this joint support method has problems such as complicated construction procedures, low support efficiency and high support costs.

[0015] The above support forms are difficult to apply under the conditions of complex geological conditions, developed fractures, deep coal seams, and soft coal seams, which are prone to roof caving and bottom heaving, two sides moving closer, and coal roadway deformation, damage, and support to varying degrees. Damage and other problems make it difficult for the coal roadway to meet the normal use requirements and cannot ensure the driving speed of the coal roadway; therefore, the tunneling and support of the coal roadway has become one of the bottlenecks that plague the normal production of coal mines

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