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考虑底板岩体分层特性,将采场底板视为弹性层状半无限平面体,采用传递矩阵法建立层状底板的应力计算模型。用Matlab编制了相应的计算程序,求解得到不同分层深度处的底板应力分布,根据Mohr-Coulomb准则判断底板塑性区分布。新建模型考虑了不同底板岩性及其组合条件,理论计算得到的底板破坏深度比传统方法更符合实际,建立不同的软硬互层采场底板模型,分析了岩体的软硬性质对采场底板应力分布和破坏特征的影响。研究结果表明,硬岩底板对支承压力具有降低和扩散作用,降低作用减小了底板深处应力,有效地抑制了采场底板破坏深度;扩散作用加大了下卧岩层的应力影响范围,导致下卧岩层破坏范围增加,软岩底板由于其承载能力弱,会加剧底板应力的集中程度,导致底板岩层的破坏深度和范围都大大增加。
Considering the stratification characteristics of floor rock mass, the stope floor is regarded as elastic layered semi-infinite plane body, and the stress calculation model of stratified floor is established by transfer matrix method. The corresponding calculation program was compiled by Matlab, the stress distribution of the floor at different depths of stratification was solved, and the plastic zone distribution of the floor was judged according to the Mohr-Coulomb criterion. The new model takes into account different lithology and combination conditions of the bottom floor. The depth of destroying floor calculated by the theory is more realistic than the traditional method. Different floor models of stopes with different soft and hard stratums are established, and the soft and hard properties of the rock mass are analyzed. Effect of floor stress distribution and failure characteristics. The results show that the hard rock floor has the effect of reducing and diffusing the supporting pressure, reducing the stress of the floor and reducing the depth of the floor of the stope. The diffusion effect increases the stress influence range of the lower rock formation, resulting in Underlying rock failure area increases, soft rock floor because of its weak carrying capacity, will aggravate the floor stress concentration, resulting in the destruction of the floor rock depth and range are greatly increased.