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以弱胶结围岩条件下马头门为工程背景,采用岩石力学实验、理论分析和数值模拟等技术手段,研究了主应力大小和方向对马头门顶板、底板和两帮围岩变形规律的影响及最大主应力区的分布特征。研究结果表明:随?和H的增加,马头门围岩的最大位移值和应力扰动区深度呈线性增加,围岩变形受侧压力系数影响程度表现为两帮>底板>顶板;马头门布置最危险的走向并非与最大水平主应力垂直,而夹角?在20°与60°时马头门顶板围岩应力集中系数最大,夹角?=0°时,马头门围岩相对最稳定,围岩变形量受夹角变化影响程度表现为顶板>底板>两帮;马头门围岩变形、应力分布及应力集中程度受马头门断面形状的影响显著,夹角?与应力集中系数呈非线性关系。根据研究结果对马头门的支护结构进行设计优化。
Based on the background of weak cemented rock in Ma Taumen, the effect of principal stress on the deformation of the top and bottom slabs of Ma Taumen and the surrounding rocks of Maotoumen was studied by means of rock mechanics, theoretical analysis and numerical simulation. And the distribution of the maximum principal stress area. The results show that the maximum displacement and the depth of stress disturbance zone increase linearly with the increase of H and H, and the deformation of surrounding rock is affected by the lateral pressure coefficient as two supports> base plate> roof; The most dangerous trend of arrangement is not perpendicular to the maximum horizontal principal stress, but the angle between them is the largest at the angle of 20 ° and 60 ° The deformation, stress distribution and stress concentration of the surrounding rock of Matou Gate are significantly affected by the shape of the section of Matoumen. The angle and stress concentration The coefficient is nonlinear. According to the research results, the support structure of Matoumen was optimized.