基于楔形效应的隧道锚锚体长度设计探讨

Discussion on Design of Tunnel Anchorage Body Length Based on Wedge Effect

采用围岩破坏阶段的极限状态公式,计算得到各级荷载对应的锚体长度,并以7倍设计荷载计算得到的锚体长度为研究对象,结合最大剪应力公式和抗滑移稳定公式对其进行稳定性安全系数验算分析。结果表明:1)利用极限破坏状态公式计算的各级荷载与锚体长度呈线性增长的关系;2)采用2种公式计算的安全系数符合规范要求。

Based on the limit state formula of surrounding rock failure stage, the length of the anchoragebody corresponding to the load at all levels was calculated and the length of the anchorage body calculatedby 7 times of the design load was taken as the research object. Combining the formulas of maximum shearforce and shear resistance stability formula, the safety coefficient for its stability was checked andanalyzed. The results have showed： 1） The load at each level and the length of anchorage body increaseslinearly by the formula of ultimate failure state; 2） The safety coefficient calculated by the two kinds offormulas conforms to the standard requirements.