Determining method of mining roadway critical width

A critical width and recovery roadway technology, applied in tunnels, tunnel linings, mining equipment, etc., can solve the problems of large deformation of surrounding rock, instability of two sides, roof fall of roadway, etc., and achieve low cost, simple construction, and low input cost Effect

Inactive Publication Date: 2018-05-15
GUIZHOU UNIV
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  • Abstract
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Problems solved by technology

However, under the condition of broken overlying rock, the traditional scaffolding support must be considered. If the roadway width of ordinary surrounding rock is still used for excavation, it is easy to cause problems such as partial roof collapse of the roadway, instability of the two sides, large deformation of the surrounding rock, and difficult support.

Method used

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  • Determining method of mining roadway critical width
  • Determining method of mining roadway critical width
  • Determining method of mining roadway critical width

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Embodiment

[0055] refer to Figure 1 to Figure 5 , this embodiment provides a method for determining the critical width of a mining roadway, and a method for determining the critical width of a mining roadway, including the following steps:

[0056] 1) Determine the main parameters of the Platts arch theory: the top of the mining roadway is the falling gangue from the upper coal seam working face and the top coal damaged by the upper layered working face, and the two sides are also broken coal bodies, and the cross-sectional shape of the roadway is equal to Waist trapezoid, to form a Platts arch above the roadway, the roadway burial depth H must be greater than 2 times the Platts arch height or 2.5 times the Platts arch span, which can meet the applicable conditions of the Platts arch theory.

[0057] (1) The firmness coefficient of the rock and the internal friction angle of the exchange number

[0058] According to the coal sample test done in the laboratory, the uniaxial compressive ...

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Abstract

The invention provides a determining method of the mining roadway critical width. The method includes the steps of determining main parameters of a Platt's arch theory, calculating mining roadway surrounding rock pressure, and determining the mining roadway critical width. The deformation of a broken rock-covering mining roadway is effectively controlled, an I-beam shed supporting technology is adopted according to the occurrence features of the roadway, the formation principle of the broken rock-covering Platt's arch structure is analyzed, and the mining roadway critical width is researched.The invention belongs to the technical field of roadway construction.

Description

technical field [0001] The invention provides a method for determining the width of a roadway, which belongs to the technical field of roadway construction. technical background [0002] The physical and mechanical properties of surrounding rock under complex conditions are directly related to its occurrence environment. When the roadway encounters broken zones, fault zones, joint development sections and mining influences, the strength of the rock mass is greatly reduced. After the roadway is excavated, the surrounding rock of the roadway presents unstable deformation and damage, which poses a great threat to the safety of coal mine production. In order to effectively solve the engineering problems of mining roadway with broken overburden, the support form and driving size of the roadway are the key. The excavation width of the roadway should be less than the critical width of the roadway, that is, the maximum excavation width that meets the normal use conditions of produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/18E21F17/00G06Q50/02
CPCE21D11/18E21F17/00G06Q50/02
Inventor 左宇军林健云邬忠虎王浩于美鲁孙文吉斌税越刘镐席仕军
Owner GUIZHOU UNIV
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