张拉工艺对压力分散型锚索荷载不均匀系数的影响

INFLUENCE OF STRETCHING TECHNOLOGY ON LOAD NON-UNIFORM COEFFICIENT OF PRESSURE-DISPERSIVE ANCHOR CABLE

压力分散型锚索锚固段受力均匀并有可靠的防腐蚀系统,特别是在软弱破碎地层中可以提供高于拉力型锚索数倍的承载力,近年来在国内岩土加固工程中逐步得到应用。由于压力分散型锚索各承载体单元长度的差异,容易导致锚索各承载体单元荷载的差异,对锚索的加固效果产生不利影响。通过对压力分散型锚索荷载不均匀系数的探讨,分析不同张拉工艺时压力分散型锚索的荷载不均匀系数,探讨消除和减小锚索荷载不均匀系数的对策,提出工程加固中合理选用压力分散型锚索的建议。针对不同工程条件通过对锚索张拉工艺的调整,可以大大降低锚索的荷载不均匀系数,说明压力分散型锚索不仅适用于临时工程,也可以满足永久性工程需要。

The pressure-dispersive anchor cable is gradually applied to domestic rock and soil reinforcement engineering recently because of the advantages of stress uniform distribution in anchorage section and reliable anti-corrosion capability, and it can supply bearing capacity which is several times as high as that provided by tension anchor cable. The load difference of loading body cell can bring disadvantage effect to anchor cable reinforcement. The load non-uniform coefficient of pressure-dispersive anchor cable is discussed and analyzed under conditions of different stretching technologies, and the method to eliminate and decrease the non-uniform load coefficient is discussed. Aiming at different engineering conditions, by adjusting the stretching technology of anchor cable, the load non-uniform coefficient can be reduced greatly, which shows that the pressure-dispersive anchor cable can be used to temporary works and permanent engineering.