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以某矿沿底留顶煤回采巷道为研究对象,采用理论分析和FLAC2D数值模拟为主要方法,分析了矩形、直墙半圆形和圆形3种断面形状对巷道围岩塑性区发育特征、应力分布特征和围岩变形特征的影响。直墙半圆拱形断面与圆形断面比较而言,围岩塑性区发育范围、应力分布特征和变形特征降低程度减小;针对沿底留顶煤回采巷道而言,直墙半圆拱形断面是较优断面形式。
Taking the mine roadway with the top coal retained along the mine as the research object, the theoretical analysis and FLAC2D numerical simulation are taken as the main methods to analyze the development characteristics of the plastic zone of the surrounding rock of the roadway with the three kinds of cross-section shapes of rectangle, straight wall, Stress distribution and deformation of surrounding rock. Compared with the circular section, the development range, stress distribution and deformation characteristics of the plastic zone of the surrounding rock are reduced. For the semi-circular arched section of the straight wall, Better cross-section form.