短桩与锚杆组合应用的复合型杆塔基础数值模拟分析

短桩与锚杆组合应用的复合型杆塔基础是一种应用于上覆浅土层岩石地基的新型杆塔基础.以某500 kV输电线路工程为背景,开展了新型基础设计,并应用FLAC3D有限元程序对该型基础的6种模型进行数值模拟.结果表明:短柱与锚杆组合应用的复合型基础可以满足输电线路杆塔基础荷载的要求,短柱底部施加锚杆可以显著提高基础的抗拔承载性能,但对抗倾覆性能的提高较小,此时可以通过增大立柱直径与增加基础埋深来提高高露头复合型基础的抗倾覆能力.

Numerical Simulation of Compound Foundation with Short Pile and Anchor

The compound foundaiton with short pile and anchor is a new type tower foundaiton that is applied in the rock foundation covered shallow soil layer. Based on a 500 kV transmission linge project, the new type foundaiton was designed, and 6 kinds of numerical simulation model were studied with FLAC3D finite clement program for this foundation. The results show that the compound foundaiton with short pile and anchor can meet the load requirements of transmission line tower foundation, the short pier using anchor at bottom can significantly improve the foundation＇ s uplift bearing capacity, but the improvement of anti-overturning capacity in not obvious. In view of this situation, it can improve the anti-overturning capacity of compound foundation by enlarging the upright diameter and increasing the buried depth depth that is much more effective.