长径比对桩基端阻力和侧摩阻力影响的数值模拟

Numerical Simulation of Effect of Length-diameter Ratio on Tip Resistance and Lateral Friction of Pile Foundation

利用FLAC3D数值模拟软件,模拟分析不同长径比时,在竖向荷载作用下,桩身轴力、侧摩阻力、端阻力及侧摩阻力与端阻力的荷载分担关系,并总结相应规律.结果表明:桩身越长轴力衰减越快,长径比越大,桩身侧摩阻力达到极限时所施加的荷载越大.不同长径比条件下,桩侧摩阻力与桩顶荷载接近线性增加关系.有荷载作用时,桩侧摩阻力先承担荷载发挥作用,后逐渐由桩端阻力分担,最终桩侧摩阻力与桩端阻力共同承担荷载.

Using FLAC3D numerical simulation software to simulate the pile axial force,lateral friction tip resistance and lateral friction and tip resistance load sharing relationship,and summarize the corresponding laws under the vertical load.The results show that the longer the pile is,the faster the axial force decays,the longer the ratio of pile diameter,the greater the lateral friction at the limit side of the pile.the increase of pile-diameter ratio makes the lateral friction of the same pile body continuously decrease,and the tip resistance gradually tends to be stable as the pile top load increase.When the load is applied,the frictional load on the side of the pile bears the load first,and then is gradually shared by the resistance at the end of the pile.Finally,the frictional resistance at the pile side and the resistance at the pile end jointly bear the load.