Method for evaluating foundation stability of coal mining subsidence area

An evaluation method and technology for subsidence areas, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as concentrated deformation, overall strength and stiffness reduction, and ground building impacts

Inactive Publication Date: 2016-07-27
TANGSHAN BRANCH COAL SCI ACAD
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Problems solved by technology

After the coal seam is mined, the overlying strata will form a caving fault zone, and its overall strength and stiffness will decrease significantly.

Method used

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  • Method for evaluating foundation stability of coal mining subsidence area
  • Method for evaluating foundation stability of coal mining subsidence area
  • Method for evaluating foundation stability of coal mining subsidence area

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Example Embodiment

[0087] Example 1

[0088] A residential area in Pingdingshan plans to build a 13-story (39m high) residential building, and the proposed area is located above the goaf. The coal seam mined in the goaf is Group E coal seam, with a coal seam thickness of 5.0m, a coal seam inclination of 8-10°, and a minimum mining depth of about 87m. The mining time was from 1966 to 1973. The coal mining method was normal longwall mining or fully mechanized mining. The trapping method manages the roof.

[0089] After calculation, the depth of influence of building load (H shadow ) Is 33m (refer to Table 3), the height of the collapsed fault zone in the goaf (H crack ) Is 48.7m (calculated according to the formula for the maximum height of the water-conducting fracture zone in the gently inclined thick coal seam mining in Table 2), and the sum of the two is 81.7m. The minimum mining depth (H Pick ) Is 87m. The analysis and evaluation believe that the depth of the mined-out area will not be affect...

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Abstract

The invention discloses a method for evaluating the foundation stability of a coal mining subsidence area. The method comprises the following steps of (1) calculating the height of a caving fracture zone: according to different geological and mining conditions, measuring related parameters and selecting a calculation formula or an empirical formula for the height of the caving fracture zone; (2) calculating the load impact depth of the coal mining subsidence area: according to the geological stratum conditions of a goaf, analyzing the gravity stress and additional ground stress of a foundation and determining a calculation method for the building load impact depth of the coal mining subsidence area; and (3) evaluating the foundation stability of the coal mining subsidence area: according to a mutual relation among the mining depth H<mining> of a coal seam, the height H<fracture> of the caving fracture zone in the coal mining subsidence area and the building load impact depth H<impact>, evaluating the foundation stability of the coal mining subsidence area. The method is suitable for foundation stability evaluation of different mining methods and mining processes under different geological and mining conditions, and is wider in application range and good in evaluation effect.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of coal mining subsidence areas, and relates to an evaluation method for foundation stability of coal mining subsidence areas, in particular to an evaluation method for foundation stability of newly built (structure) structures in coal mining subsidence areas. Background technique [0002] The large-scale mining of coal resources in the mining area has left a large area of ​​goaf, and the residual cavity or ruptured rock mass in the goaf has changed the engineering geological characteristics and properties of the stratum and rock mass, forming complex foundation conditions with poor engineering geology, which hinders utilization The use of the surface of the coal mining subsidence area as construction land brings difficulties and hidden dangers, which seriously restricts the development of urbanization in the mining area. In recent years, the urban engineering construction in my country's ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/02G06Q50/08
CPCG06F30/13G06Q50/02G06Q50/08
Inventor 滕永海唐志新易四海郭轲轶郑志刚朱伟李悦
Owner TANGSHAN BRANCH COAL SCI ACAD
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