Method for determining stability of end slope mining supporting coal pillar based on physical simulation test

A technology of physical simulation and method determination, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, measuring devices, etc., can solve equipment buried accidents, open-pit mine side slope landslides, and affect the safety and normal mining work of mining areas and other issues to achieve reliable results

Pending Publication Date: 2021-12-14
LIAONING TECHNICAL UNIVERSITY +1
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Problems solved by technology

If the supporting coal pillar is unstable and damaged, it will not only cause equipment buried accidents, but also may cause a series of engineering disasters such as side slope landslides in open-pit mines, which will seriously affect the safe and normal mining work in the mining area, causing incalculable casualties and economic losses

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  • Method for determining stability of end slope mining supporting coal pillar based on physical simulation test
  • Method for determining stability of end slope mining supporting coal pillar based on physical simulation test
  • Method for determining stability of end slope mining supporting coal pillar based on physical simulation test

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Embodiment Construction

[0035] The invention will be further described below in conjunction with the accompanying drawings and specific implementation examples.

[0036] Such as figure 1 As shown, a method for determining the stability of supporting coal pillars in end-side mining based on physical simulation tests includes:

[0037] Step 1: Construct a physical simulation test model of engineering geology to be monitored; including:

[0038] Step 1.1: Determine the geometric similarity ratio of the physical simulation test model according to the geometric dimensions of the comprehensive simulation test platform and the distribution of engineering geology to be monitored;

[0039] Step 1.2: Determine the geometric size and stress boundary of the model according to the geometric similarity ratio;

[0040] Step 1.3: Through the orthogonal test, compare the cementing material and the design strength to determine the mix ratio of each simulated rock formation, and simulate the coal seam distribution in...

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Abstract

The invention provides a method for determining stability of an end slope mining supporting coal pillar based on a physical simulation test, which comprises the following steps of: firstly, establishing a physical simulation test model of engineering geology to be monitored, simulating a process that the supporting coal pillar is unstable along with load increase, and collecting vertical stress of each measuring point to draw a stress curve; judging whether the coal pillar is unstable or not according to the shape of the stress curve, wherein the vertical stress of the coal pillar is distributed in a saddle shape in the recovery process and is in a stable state, in the graded loading process, the widths of the coal pillars are sequentially subjected to shear failure from small to large, sudden increase of vertical stress in the middles of the coal pillars is a premonition of instability, and vertical stress sudden change inflection points serve as coal pillar instability early warning criteria. According to the invention, the actual situation of an engineering site can be accurately simulated, and a reasonable design basis is provided for relevant parameters of the support coal pillar.

Description

technical field [0001] The invention relates to the technical field of stability of coal pillars supported by side-side mining in open-pit coal mines, in particular to a method for determining the stability of side-side mining-supported coal pillars based on physical simulation tests. Background technique [0002] my country's Xinjiang, Inner Mongolia, Shanxi, Qinghai and Tibet coal production bases contain a large number of shallow coal seams, which are suitable for open-pit mining, resulting in a large amount of side-by-side pressed coal (detained coal). There are still a large amount of high-quality coal in the retained coal, and abandonment of mining will cause a huge waste of resources. The side-side mining technology has been successfully applied in a large range abroad. In recent years, with the continuous development of the domestic side-side mining technology, a new method has been provided for the recovery of retained coal. In end-side mining, coal mining machines...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/02
CPCG01N3/08G01N3/02G01N2203/0252G01N2203/0676G01N2203/0062
Inventor 姜聚宇张卓蔚王东付天光韩新平李磊杨蒙曹克楠路烨杨慧雯
Owner LIAONING TECHNICAL UNIVERSITY
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