群锚基础承载力的计算方法

结合国家重点建设项目５００ｋＶ送电线路岩石锚杆基础试验结果，对群锚基础的形式、破坏机理、影响承载力的因素、承载力的计算方法进行了分析，得出了直锚式群锚受力比承台式群锚受力更合理，水平力对承载力影响较小；岩体的抗剪强度、埋地承载力影响较大；锚筋受力较小。针对现有规程时承载力的计算，文中提出了新的计算公式。

Calculation Method of Bearing Capacity of Group Anchorage Foundation

The paper refers to experimental results on rock foundations of 500KV transmission lines which belong to nation's major projects, and analyzes types of group anchorage foundation, mechanism of destructive phenomena, influence factors of bearing capacity, and calculation methods of bearing capacity. It is concluded that the forces distribution of the vertival group anchorage foundation is more reasonable than those of mat form group anchorage; the influence of horizontal forces is less; the shearing stress of the rock and depth of burying play significant effect on bearing capacity;the force acting on reinforcement steel of anchorage is less; and the bearing capacity calculated from current applicable codes is rather conservative. New calculation formaulas are suggested.