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Protective coal pillar width retaining method based on shape of overburden stratum moving boundary

A technology for moving boundaries and protecting coal pillars, applied in mining equipment, earth-moving, pillars/supports, etc. question

Active Publication Date: 2019-02-19
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on the moving boundary of the rock formation is extremely limited, and the existing research cannot accurately explain the shape of the moving boundary of the rock formation, let alone study the moving boundary shape of the bedrock and the loose layer with large differences in physical and mechanical properties.

Method used

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  • Protective coal pillar width retaining method based on shape of overburden stratum moving boundary
  • Protective coal pillar width retaining method based on shape of overburden stratum moving boundary
  • Protective coal pillar width retaining method based on shape of overburden stratum moving boundary

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Embodiment

[0141] Dingwusan Chengren Alley (referred to as: Chengren Alley) in the First Mine of Pingdingshan Tianan Coal Industry Co., Ltd. is about 440m deep, and the thickness of the loess is about 5.1m. The section size of the Chengren Alley is (width×height) 4.2m×3.0 m, adopt the joint support method of anchor rod and anchor cable, the diameter of the anchor rod is Φ=20mm, the length L=2.2m, the row spacing is 700mm×700mm, the diameter of the anchor cable is Φ=20mm, and the length L=7.0m. There are E10-21210 and E10-31010 working faces arranged in the E10 coal seam on the floor of Chengren Lane. Figure 6 It is a schematic plan view of the passenger alley and the working face, Figure 7 for Figure 6 Schematic diagram of the structure in the A-A direction.

[0142] Such as Figure 6 As shown in the figure, 1#~20# in the figure represent the numbers of the measuring points arranged in the Chengren Alley, and Ⅰ~Ⅴ in the E10-31010 working face are the mining positions of the working...

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Abstract

The invention discloses a protective coal pillar width retaining method based on the shape of an overburden stratum moving boundary. The protective coal pillar width retaining method includes the following steps that (1) moving parameters of a mining area are collected and determined; (2) moving boundary shapesof bedrock and an unconsolidated formationare determined; (3) a moving boundary equationof the bedrock and the formationis determined according to the moving parameters and the boundaryshapes; and (4) the width of a protective coal pillar is designed according to the moving boundary equationof the bedrock and the formation and the position of a protected object in the mining area. According to the protective coal pillar width retaining method based on the shape of the overburden stratum moving boundary, the width of the protective coal pillar of the protected object is determined according to the actual shapeof the overburden stratum moving boundary, the protected object can beaccurately locatedout of the mining influence range, and thus a powerful tool for utilization of an underground space in a coal mine is provided.

Description

technical field [0001] The invention belongs to the field of coal measure strata research, and in particular relates to a method for setting the width of a protective coal pillar based on the movement boundary shape of overlying rock. Background technique [0002] Coal-measure strata are typical layered rock formations. The mining of underground coal seams will cause movement of rock formations within a certain range, such as subsidence and horizontal displacement. The boundary of rock strata movement is the basis and premise for the prediction of strata movement and deformation, and the protection of ground houses, underground roadways and structures outside the scope of coal mining. Traditionally, the movement boundary of rock strata is considered to be a straight line. Based on this understanding, a mathematical expression for the relationship between the movement and deformation of the ground surface and the inner strata of the overlying rock is established, but the pred...

Claims

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Application Information

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IPC IPC(8): E21D15/00E21C41/18G06Q50/02
CPCE21C41/18E21D15/005G06Q50/02
Inventor 何昌春卢卫永
Owner EAST CHINA UNIV OF TECH
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