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Research on Roof Weighting Mechanism of Near Shallow Seam Longwall Face

Author: CaoMing
Tutor: HuangQingXiang
School: Xi'an University of Science and Technology
Course: Mining engineering
Keywords: Near the shallow coal seam Dual key layer Pressure law of mine Compound effect Mine pressure model
CLC: TD327.2
Type: Master's thesis
Year: 2010
Downloads: 154
Quote: 0
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Abstract


China in recent years typical Yushenfu mining shallow face a more in-depth research, draw its strata behavior law and roof pressure mechanism. However, the bedrock thicker near double critical layer overlying shallow seam longwall face strata behavior regularity and roof pressure Mechanism small, there is still a lack of understanding of the integrity and unity of. Therefore, the study reveal near shallow longwall mine pressure behavior law and roof pressure mechanism of scientific mining near Shallow Face of the future YUSHENFU mine of important guiding significance. The instructors assume Ministry of Education Scientific Research Foundation project \buried face example study. First, the geological features of Yushenfu mining near shallow seam. By field measurement and similar simulation study, draw near shallow longwall the special strata behavior law. Similar simulation and numerical simulation of the the key strata control layer theory based, come overlying bedrock main Asian double critical layer breaking law of motion. Finally, the theoretical analysis and modeling, reveals near shallow seam longwall mining roof pressure mechanism. Studies have shown that the Yushenfu mining occurrence near seam, mainly the thick bedrock and overlying double critical layer structure. Shallow face near persists obvious initial pressure and cycle pressure, pressure during stent dynamic load significantly, no significant stage sinking pressure step distance and intensity generally shows the non-uniformity of the size of cycle. Similar simulation and numerical simulation derived master key layer of broken-off led to the lower sub-critical layers with which synchronization broken off, the main key stratum initial break off and cycle break off often the formation of large to pressure, to pressure appeared strong, sub-critical layer initial break off and cycle break off often the formation of small pressure, the two groups critical layer of non-uniform size cycle breaking is the cause of the root cause of the near shallow face special pressure law of mine. Through the composite effect of discrimination, two near shallow surface covered with double key layer will produce the composite effect. By to pressure affect the degree of discrimination, two near shallow work surface overlying the main Asian double critical layer breaking both will have a significant impact on pressure. The theoretical analysis and model calculated near shallow longwall face pressure to step and strength generally shows the non-uniformity of the size of cycle pressure law, and thus the special near shallow seam longwall mining reasonable explanation for recent shallow buried Roof control to provide a theoretical basis.

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CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Rock pressure and rock movement > Rock subsidence and safety measures > Roof Management
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