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Zhaozhuang II drilling wells with large mining height fully mechanized mining face . PRESSURE AND STRATA

Author: ZhaoHui
Tutor: XiongZuQiang
School: Henan Polytechnic University
Course: Mining engineering
Keywords: Large mining height Strata Characteristics Bearing pressure distribution Similar simulation Numerical Simulation
CLC: TD326
Type: Master's thesis
Year: 2011
Downloads: 200
Quote: 3
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Abstract


Large Mining Height Fully Mechanized drilling with energy efficient, simple process characteristics, both adapted to 10m or more conventional wall face exploitation, but also for resource-exhausted mine resources and recycling small segment pillar; than ordinary large mechanized mining geology and mining face can adapt to changing conditions, small and medium sized mines to achieve safe and efficient mining and effective way. Drilling of large mining height fully mechanized coal face pressure behavior, morphology and rock overburden stress distribution, for large mining height drilling technology popularization and application of mechanized mining has important practical significance. In this paper, field measurement, theoretical analysis, simulation and numerical simulation similar to other methods for large mining height fully mechanized mining face drilling pressure patterns studied. Using the theory of critical layers of strata movement were studied, and the theoretical calculations. Through on-site monitoring data analysis features Face Strata discussed Reasonable Support Resistance. Simulated by means of the use of similar activity patterns and overlying strata caving characteristics were analyzed. Numerical simulation method to analyze the face strike, dip, different mining height and face length under different abutment pressure distribution. Studies have shown that large mining height fully mechanized coal face drilling Strata obvious, basic roof to roof level II to pressure significantly, during the first weighting basic roof support load and dynamic load factor is less than during the periodic pressure support load and dynamic load factor ; and general large length of fully mechanized mining face comparison, the roof pressure step increases, dynamic load factor decreases, supporting peak pressure, location and scope of the reduction; support load is approximately normal length large mining height working 76% of the surface and is dominated by static load, reasonable mining height support resistance of approximately 4.3 times the weight of the rock pillars. Overburden caving mining height is 2.5-3 times higher caving zone and fractured zone height is greater than the traditional empirical formula to calculate the maximum, so the basic roof at a higher level for the formation of \The exercise on the top seam directly generate additional force, its period instability caused by periodic pressure. Mining height increases, the scope of abutment pressure, a non-linear relationship between peak position increments, while the stress concentration factor decreases. Face shorter, the abutment pressure sphere of influence, the size and location of the peak decreases, the \Normal Large Working weaker.

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CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Rock pressure and rock movement > Mine pressure Observation and equipment
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