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在压力分散型锚索地质力学模型试验的基础上,对压力分散型锚索的每个单元承载体采用了分级循环加载的方法进行数值分析,研究压力分散型锚索各单元内力变化规律,并根据压力分散型锚索锚固段的受力及变形状态,得到了有关压力分散型锚索锚固机理的认识。分析结果表明:坚硬岩体中的锚固段上单元间内力影响较小,无应力叠加现象,而软弱岩体中的锚固段上单元间内力影响较大,会出现较为严重的应力叠加现象;基于弹性理论及摩尔-库仑准则的有限元理论可以较好地解释锚索注浆体在分级循环加载后的应力、粘结应力分布规律以及合理承载体间距(单元长度)。研究结果对正确分析压力分散型锚索加固作用机理和锚固工程设计具有较好的参考价值。
Based on the geomechanical model test of pressure-dispersion anchor cable, numerical analysis is carried out on each unit load-bearing body of pressure-dispersive anchor cable by cyclic loading method to study the variation of internal forces of each unit of pressure-dispersion anchor cable According to the stress and deformation state of the anchorage section of pressure-dispersive anchor cable, the understanding about the anchoring mechanism of pressure-dispersion anchor cable is obtained. The analysis results show that the inter-unit internal force has little influence on the anchorage section in hard rock mass, and there is no phenomenon of stress superimposition. However, the inter-unit internal forces in the weak rock mass have a greater influence, and the more serious stress superimposition will occur. The theory of elasticity and the finite element theory of Mohr-Coulomb criterion can well explain the stress, bond stress distribution and reasonable carrier spacing (unit length) of anchor grouting after cyclic loading. The results of the study have a good reference value for the correct analysis of the stress-dispersion type anchor cable reinforcement mechanism and anchorage engineering design.