Prediction method for dynamic growth height of caving zone with immediate roof internally including structural rock stratum

A prediction method and structural technology, applied in prediction, instrumentation, climate change adaptation, etc., can solve the problem that the height of the caving zone does not reflect the correlation of mining time

Active Publication Date: 2017-04-26
INNER MONGOLIA YITAI COAL +1
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Problems solved by technology

[0005] The traditional empirical formula is only established with lithological strength as a single index, and the mining height and caving zone are linearly related

Method used

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  • Prediction method for dynamic growth height of caving zone with immediate roof internally including structural rock stratum
  • Prediction method for dynamic growth height of caving zone with immediate roof internally including structural rock stratum
  • Prediction method for dynamic growth height of caving zone with immediate roof internally including structural rock stratum

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Embodiment Construction

[0041] Below in conjunction with the accompanying drawings, the present invention will be further described by taking the practical application of the method of the present invention in the mining of large mining height working face as an example.

[0042] Such as figure 1 As shown, the pre-mining drilling exploration data in the northern mining area of ​​a coal mine show that there are structural rock formations in the immediate roof 直 ;According to the data of drilling data, the application of key layer theory calculation shows that the basic top 10m thick fine sandstone is the main key layer, and the basic top is structural rock formation 基 , the 5.5m fine sandstone directly inside the roof is a structural rock formation 直 , structured rock formations 直 It is a sub-key stratum; according to the key stratum theory, it is determined that the overlying strata on the coal mining face can be divided into weak strata directly below the top and structural strata from bottom to t...

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Abstract

The invention relates to a prediction method for the dynamic growth height of a caving zone, and the method is suitable for height prediction of the caving zone of a large-mining-height working surface of a thick seam layer and is carried out under the condition that an immediate roof internally includes structural rock stratum. The method mainly comprises the following steps that a key layer is determined; the number of overburden layers is determined; when t1<tm', the key layer is positioned in a slit band, and a caving height is calculated to be H4; when tm'+1<ti, the structural rock stratum is positioned in the caving zone straightly, and a caving height is calculated to be H5; when ti+1<tj, the structural rock stratum is positioned in a bent sinking band, and a caving height is calculated to be H6; and when tj+1<tn, a height of the caving zone of a goaf in the total sinking period of the caving zone is calculated to be H7. According to the method, deadweight compressing performance and a time sequence of the caving zone and exploitation caused by that a caving space of the goaf is large are taken into consideration, dynamic distribution the caving zone is divided into four stages of analysis, calculation and prediction, the caving zone of the large-mining-height working surface can be reflected accurately, and basis is provided for support type selection, coal mining technology design, and top board flood damage control.

Description

Technical field: [0001] The invention relates to a method for determining the dynamic development height of caving zones in thick coal seams and large mining height working faces of coal mines, and is especially suitable for determining the dynamic development heights of caving zones in weakly cemented strata in the western and northwestern mining areas of my country. Background technique [0002] In the process of coal mining, the movement of rock strata above the stope is generally divided into three zones: caving, fracture and bending subsidence according to the range of movement and degree of damage. The caving zone refers to a penetrating fracture in the rock formation, and the rock blocks are piled up irregularly after falling. There is only gravity extrusion between the rock blocks, and the weight of the rock block accumulation needs to be fully borne by the lower support body. . The fault zone refers to the large amount of deformation of the rock formation above the...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02Y02A10/40
Inventor 武亚峰刘阳军孙利辉张振金
Owner INNER MONGOLIA YITAI COAL
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