Method for calculating pressure step distance of shallow coal seam covered with thin bedrock

It is a technology of pressure step and calculation method, which is applied in calculation, earthwork drilling, ground mining, etc., and can solve problems such as less research, and achieve the effect of simple calculation method, strong practicability, and ensuring scientificity

Active Publication Date: 2020-05-05
XIAN UNIV OF SCI & TECH +1
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  • Claims
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Problems solved by technology

[0003] The existing research results have achieved fruitful research results in the fracture and instability of rock formations, but there are few studies on the mechanism of dynamic evolution of mining fractures induced by bedrock fracture and instabi

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  • Method for calculating pressure step distance of shallow coal seam covered with thin bedrock
  • Method for calculating pressure step distance of shallow coal seam covered with thin bedrock

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Example Embodiment

[0029] The content of the present invention will be further described below in conjunction with the actual occurrence of the 125203 working face of Anshan Coal Mine.

[0030] Anshan Coal Mine is located in the Yushenfu mining area in my country. It is a typical shallow-buried coal seam of loess maoliang landform. The lowest altitude in the area is 1075.9m and the highest altitude is 1364.5m. The drop is large. The coal seam in the area is about 20~70m deep. The topography of the valleys is more.

[0031] Theory and practice show that the overburden layer above the bedrock in Yushenfu mining area is in a semi-consolidated state, with extremely low strength, and the bedrock is strong and thin. Therefore, after the working face is mined, under the influence of the mine pressure, when the overburden When the stress is greater than the friction required for its sliding down, the overburden will be cut to full thickness with the break of the basic roof. The actual pressure on the bedrock ...

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Abstract

The invention discloses a method for calculating the pressure step distance of a shallow coal seam with a thin bedrock. The method comprises the following steps of first, determining bearing reactionsFRA and FRB at two ends of a non-uniform load beam; second, determining the maximum shear stress Taumax of the non-uniform load beam; and third, calculating and determining the pressure step distanceL of a basic roof according to the first formula, wherein in the first formula: h is the thickness of the non-uniform load beam, [Tau] is the ultimate shear strength of the non-uniform load beam, a is the buried depth of a shallow buried end of a cover layer above the non-uniform load beam, b is the buried depth of a deep buried end of the cover layer above the non-uniform load beam, and Gamma isthe average volume force of the cover layer. The invention provides the method for calculating the pressure step distance of the shallow coal bed covered with the thin bedrock.

Description

Technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for calculating the stepping distance of a thin bedrock shallow coal seam. Background technique [0002] It is generally considered that the buried depth is less than 150 meters, the base load ratio is less than 1, and the roof reflects the structural characteristics of a single key layer. The coal seam with obvious dynamic load is called shallow coal seam. Generally, the bedrock whose thickness is less than 30 meters to 50 meters is called thin bedrock. my country's shallow coal seams are rich in resources, which are mainly distributed in the Yushenfu mining area in my country. Coal plays an important supporting role in its regional economic development. The surface morphology of the area where the working face of Shenfu mining area is located is complex, with ravines vertical and horizontal, deep and steep. In most areas, the coal seam is buried shallow, on...

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Application Information

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IPC IPC(8): E21F17/18E21F17/00E21C41/18G06Q50/02
CPCE21C41/18E21F17/00E21F17/18G06Q50/02
Inventor 张杰刘清洲杨森杨涛王斌
Owner XIAN UNIV OF SCI & TECH
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