砂土中螺纹桩承载特性的模型试验研究

通过室内模型试验，研究砂土中螺纹桩的竖向承载特性，比较分析螺纹桩与普通直桩承载性能的差异以及螺距对螺纹桩承载力的影响。静载荷试验后进行一系列土工试验，研究桩周土的物理力学性质。试验结果表明，在相同条件下螺纹桩的极限承载力约是普通直桩极限承载能力的1～4倍，极限状态下的平均桩侧阻力是普通直桩的3~4倍；在一定范围内，随着螺距的减小，螺纹桩的桩侧阻力可以得到有效的发挥，极限承载能力和控制沉降的能力逐渐增强。

Study of model test on bearing capacity of screw piles in sand

To compare the bearing capacity of a screw pile and a conventional straight pile,two indoor static load model tests were carried out in sand.And the effect of the pitch of a screw pile on its bearing capacity is also evaluated.After the indoor static load tests a series of soil tests are carried out to study the physico-mechanical properties of sand.The test results show that under the same conditions the bearing capacity of screw pile is 1-4 times that of conventional straight pile;and the average ultimate friction is 3-4 times that of conventional straight pile;when the pitch of screw pile decreases within a certain range,the ultimate bearing capacity,ultimate friction and the ability to control the settlement gradually increase.