新集二矿巨厚砂岩顶板采煤面前方两侧煤体应力及位移分布数值模拟
신집이광거후사암정판채매면전방량측매체응력급위이분포수치모의
Xinji Mine two thick sandstone roof coal face in front of two sides of coal body Numerical simulation of stress and displacement distribution
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