压力分散型锚索锚固机理数值分析研究

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。

Study on Anchorage Mechanism of Pressure Dispersed Anchor by Numerical Analysis

On the basis of geomechanical model test, in numerical analysis the grading cyclic loading method is adopted for each pressure dispersed anchor unit to study the changing law of internal force of each unit, and to get the understanding of the mechanism of pressure dispersed anchor on the basis of the force and deformation state. The analysis results show that: the internal force influence is very small between the units on the anchoring section in the hard rock, no stress superposition phenomenon happens, and the internal force influences between units on the anchoring section in weak rock, the stress superposition phenomenon will relatively serious; finite element theory of elastic theory and Mohr Coulomb criterion can better explain the distribution law of the stress, bond stress and reasonable bearing spacing (unit length) of the anchor grouting. The research results have a good reference value for correct analysis of anchoring and reinforcing mechanism and engineering design of the pressure dispersed anchor.