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对压力分散型锚索的每个承载体单元采用了分级循环加载的方法,通过新的地质力学模型试验,研究压力分散型锚索各单元内力变化规律,并根据试验方法和压力分散型锚索锚固段的受力状态,导出了分级循环加载条件下接触面满足摩尔-库仑强度条件时的弹性理论解。试验结果表明,在软岩和粉土地质条件下,前者的注浆体应变和剪应力分布相对后者比较集中,加载过程中单元间影响相对较小;基于摩尔-库仑准则的弹性理论解可以较好地描述锚索注浆体在分级循环加载后的应变和剪应力分布规律。研究结果对正确分析压力分散型锚索加固作用机制和锚固工程设计具有较好的参考价值。
The method of graded cyclic loading was adopted for each load cell of the pressure-dispersion anchor cable. Through the new geomechanical model test, the variation of the internal force of each unit of the pressure-dispersion anchor cable was studied. According to the test method and the pressure-dispersion anchor cable The elastic state of the anchoring section is deduced and the elastic theoretical solution of the contact surface satisfying the condition of Mohr-Coulomb strength under the cyclic loading condition is derived. The experimental results show that in the soft rock and silt geologic conditions, the former grouting body strain and shear stress distribution is relatively concentrated compared with the latter, and the impact between units during loading is relatively small. The elastic theory solution based on the Mohr-Coulomb criterion can Describe well the distribution of stress and shear stress of anchor grouts after grading cyclic loading. The research results have a good reference value for the correct analysis of the stress-dispersion type anchor cable reinforcement mechanism and anchorage engineering design.