Method for evaluating water-resisting property indexes of Middle Ordovician limestone ancient weathering crust

An evaluation method and technology of weathering crust, applied in geophysical measurement, instrumentation, etc.

Active Publication Date: 2014-08-13
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

Failed to fully analyze and exploit the natural water-proof performance of the ancient weathering crust on the top of the Austrian ash

Method used

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  • Method for evaluating water-resisting property indexes of Middle Ordovician limestone ancient weathering crust
  • Method for evaluating water-resisting property indexes of Middle Ordovician limestone ancient weathering crust
  • Method for evaluating water-resisting property indexes of Middle Ordovician limestone ancient weathering crust

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Embodiment Construction

[0053] The present invention will be described in detail below in conjunction with the accompanying drawings, taking a certain coal mine as an example.

[0054] The scope of this research is a certain five mining areas. The lithology of the paleo-weathering crust at the top of the Austrian limestone is mainly limestone, which is dense and hard, with a small number of karst fissures locally developed, and most of the dissolution pores and fissures are filled, and the filling materials are mainly carbonate weathering products, calcite veins, mudstone, etc. Therefore, the paleo-weathered crust on the top of the Austrian ash has weak water-richness and low water permeability.

[0055] 1. Determine and describe the water-proof performance indicators;

[0056] Due to the limitations of the geological exploration degree and other conditions in the study area, the indicators determined this time to describe the water-proof performance of the ancient weathering crust of Ordos ash main...

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Abstract

The invention provides a method for evaluating the water-resisting property indexes of a Middle Ordovician limestone ancient weathering crust. According to the technical scheme, the method is characterized by including the following steps that firstly, it is determined that water-resisting property indexes are depicted; secondly, thematic maps of the water-resisting property indexes are established; thirdly, weight coefficients of the indexes are determined based on the information fusion technology; fourthly, the thematic maps of the water-resisting property indexes are overlapped; fifthly, a water-resisting property evaluation model is established; sixthly, the water-resisting property is divided and evaluated. A mine lot is divided into five sub lots, a weak water-resisting property lot, a weaker water-resisting property lot, a transition water-resisting property lot, a stronger water-resisting property lot and a strong water-resisting property lot. The method for evaluating the water-resisting property indexes of the Middle Ordovician limestone ancient weathering crust is provided for the first time, and the water inrush evaluation and prediction defects that in the mining practice, the water inrush phenomenon never occurs on many water inrush points with the values far larger than a critical value in the seam floor water inrush evaluation process are overcome.

Description

technical field [0001] The invention relates to a method for evaluating the water-repellent performance of a coal seam floor, in particular to a water-repellent index evaluation method for a coal seam floor whose floor is Middle Ordovician limestone paleo-weathering crust. Background technique [0002] With the further increase of coal resources development intensity, coal resources in the shallow and upper formations of North China type coalfields are becoming increasingly scarce, and the development of deep and lower formations of coal resources has become an inevitable trend. Water hazards affecting and controlling the development of this trend In addition to the water seepage disasters in the shallow and upper coal accumulation goafs, the coal seam floor water inrush disasters are the primary problem. Due to the short distance between the lower group of coal and the Middle Ordovician limestone (partially Cambrian) on the floor, the Ordovician lime aquifer has high water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00
Inventor 武强刘守强曾一凡
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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