Construction method of coal seam floor raft foundation

A technology of coal seam floor and construction method, which is applied in earth-moving drilling, surface mining, underground mining, etc., can solve the problems of unevenness, difficulty in dredging, and high pressure.

Inactive Publication Date: 2015-09-09
CHINA COAL XINJI ENERGY CO LTD
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Problems solved by technology

The limestone karst water has the characteristics of high pressure, inhomogeneity, and difficult dredging, and the hydrological engineering geological conditions are relatively complex. Due to the threat of high pressure karst fissure water on the floor, large-scale mining of coal formation 1 has not been realized.

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  • Construction method of coal seam floor raft foundation
  • Construction method of coal seam floor raft foundation
  • Construction method of coal seam floor raft foundation

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Embodiment Construction

[0017] like Figure 1-2 As shown, the direct floor of coal seam 14 develops strata such as mudstone and sandstone. After the coal seam is mined, it loses its water-proof effect due to the impact of mining. Combination, the limestone stratum is divided into three sections: the upper section is the first layer of limestone 1, the second layer of limestone 2, the third layer of limestone 3 and the fourth layer of limestone 4, which is the main water-filled aquifer for coal seam mining, and the middle section is The fifth layer of limestone 5, the sixth layer of limestone 6, the seventh layer of limestone 7, the eighth layer of limestone 8, the ninth layer of limestone 9, and the tenth layer of limestone 10 are weak aquifers or relatively water-proof layer, the lower part is the eleventh layer of limestone 11, the twelfth layer of limestone 12 and the thirteenth layer of limestone 13, which are in parallel and unconformable contact with the underlying Austrian ash. The Austrian as...

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Abstract

A construction method of a coal seam floor raft foundation comprises the following steps: 1) selecting horizons for constructing the raft foundation: according to distribution and permeability characteristics of coal seam floor limestone aquifers, selecting limestone from first-layer limestone to fourth-layer limestone as the horizons for constructing the raft foundation; 2) determining a raft foundation area: enlarging the raft foundation scope on a plane to 35 m away from an air way, a machine way and a cutting hole of a working surface, carrying out whole-covering grouting to form a raft foundation, wherein the working surface is located in the raft foundation; 3) reinforcing and transforming the raft foundation; and 4) inspecting the raft foundation. The construction method of the coal seam floor raft foundation has the characteristics of strong adaptability, simple and easy implementation, safety and reliability, and can be widely applied in compensated mining on high-pressure-bearing water bodies.

Description

technical field [0001] The invention relates to the field of mining, in particular to a method for establishing and utilizing a coal seam floor raft foundation. Background technique [0002] Coalfields in some areas of my country, such as the lower part of the Shanxi Formation 1 coal formation, are only 18-26m away from the Taiyuan Formation limestone (referred to as Taihui). During the mining process, there have been many accidents of floor limestone flooding. Limestones from the first to the fourth layers of the upper Huihui section are directly water-filled aquifers mined from the lower coal seams of the Shanxi Formation, among which the third and fourth layers of limestone are thicker and relatively rich in water; the middle section (that is, the fifth layer Limestone to the eleventh layer of limestone roof) is thin limestone sandwiched between mudstone and sandstone, which can be considered as a relative water-resisting layer; The thick limestone of pottery series constit...

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Application Information

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IPC IPC(8): E21C41/18
Inventor 傅先杰白海波王厚柱周学年
Owner CHINA COAL XINJI ENERGY CO LTD
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