Shallow coal seam large-mining-height fully mechanized mining face coal wall caving distinguishing method
A fully-mechanized mining face and discriminant technology, applied in special data processing applications, complex mathematical operations, instruments, etc., can solve problems such as incomplete application and lack of quantitative analysis, and achieve the effect of avoiding safety accidents and economic losses
Active Publication Date: 2018-08-14
XIAN UNIV OF SCI & TECH
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[0005] To sum up, the existing theoretical analysis is not fully applicable to the fully mechanized mining face with large mining height in shallow coal seams, and the existing research lacks a quantitative analysis of the interaction among stope roof, coal wall and support. This kind of quantitative analysis is the key and basis of coal wall spallation mechanism analysis
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[0153] Basic conditions: Taking the fully-mechanized mining face with large mining height in a shallow coal mine as the background, it is known that the thickness of the key layer of the old roof is h=15m, the elastic modulus E=12000MPa, and the tensile strength of the key layer of the old roof is σ t =1.46MPa, the overlying load on the key layer q=3MPa. Equivalent direct roof thickness ∑h=12m, E 1 =3000MPa, equivalent direct top tensile strength σ t '=1.08MPa, bedrock average bulk density γ=25kN / m3. Coal seam thickness M = 5m, coal elastic modulus E m =1000MPa, the working face adopts DBT shielding hydraulic support, and the support controls the top distance l k =4.68m, support strength q 2 =1.07MPa, the initial support force is 5890kN, and the rated working resistance is 8638kN.
[0154] (1) Determination of breaking parameters of the key layer of the old roof
[0155] According to formula (13), the elastic foundation coefficient of the key layer of the old roof is:
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The invention discloses a shallow coal seam large-mining-height fully mechanized mining face coal wall caving distinguishing method. The method includes: establishing a shallow coal seam large-mining-height fully mechanized mining face 'support-coal wall-roof' structural model; establishing a main roof key stratum periodic fracture mechanical model, and determining main roof key stratum rock beamfracture distinguishing conditions; when advance fracture of a main roof key stratum occurs, establishing an equivalent direct roof elastic foundation beam mechanical model, and determining an equivalent direct roof stratum fracture discriminant; when advance fracture of an equivalent direct roof occurs, determining shallow coal seam large-mining-height fully mechanized mining face coal wall caving conditions. By organic combination of shallow coal seam large-mining-height fully mechanized mining face coal wall caving and roof movement and support control, coal wall stress states can be reflected comprehensively and accurately, a shallow coal seam large-mining-height fully mechanized mining face coal wall caving mechanism is revealed, coal wall caving distinguishing conditions are determined, and scientific bases are provided for coal wall stability control and safety mining.
Description
technical field [0001] The invention relates to the technical field of shallow-buried coal seam mining, and more specifically relates to a method for discriminating coal wall slabs of fully-mechanized mining working faces with large mining heights in shallow buried coal seams. Background technique [0002] Coal resources are abundant in western my country. Shenfu Dongsheng Coalfield is the largest coalfield in my country. The coal seams in this area are shallow in depth, stable in occurrence, simple in geological structure, large in thickness and superior in mining conditions, forming many tens of millions of tons of coal. big mine. Production practice has shown that under suitable conditions, the use of fully mechanized mining with large mining heights can achieve high-yield and efficient mining of thick coal seams. In the past 10 years, Shenhua Shendong Company has achieved rapid development of fully mechanized mining equipment and technologies with large mining heights thr...
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IPC IPC(8): G06F17/50G06F17/13
CPCG06F17/13G06F30/20G06F2119/06
Inventor 黄庆享徐璟
Owner XIAN UNIV OF SCI & TECH