垂直荷载作用下搅拌桩的现场试验

In-situ test on mixing pile under action of vertical load

在长江中下游河漫滩软基上，建造5万m3大型油罐，软土层超过25m，地基承载力标准值仅为70kPa，拟用长26m的水泥搅拌桩加固。经试桩效果检验，复合地基承载力标准值达231kPa，桩土应力比为6～8。此外，对搅拌桩的应力传递、摩阻力分布和重复加荷对地基变形的影响等进行了探讨。

On the soft foundation of flood plain at the middle lower reach of Changjiang, build large oil tanks of fifty thousand m3. The thickness of soft soil layer exceeds 25m and the standard value of foundation bearing capacity is only 70kPa, it is considered to stabilize the foundation by long cement mixing piles of 26m in length. After stabilization of trial driving the standard value of the bearing capacity of the composite f0undation reaches 231kPa, the stress ratio of pile and soil is 6～8. Besides, the stress transfer, distribution of friction force of mixing pile and the influence of repeated loading upon foundation deformation etc. are explorated also.