Field measurements regarding the influence of the installation method on soil plugging in tubular piles
Field measurements regarding the influence of the installation method on soil plugging in tubular piles
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DOI：
10.1007/s11440-012-0191-6
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发表时间：
2013-06
期刊：
影响因子：
5.7
通讯作者：
S. Henke;J. Grabe
中科院分区：
文献类型：
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作者：
S. Henke;J. Grabe
敞开式桩的堵土不仅增加了桩的抗压承载力，而且影响了桩的打入阻力。影响土堵塞趋势的因素很多，如桩径、桩深、安装方式等。本文研究了安装方式对土壤堵塞的影响。在两个仪器管桩的安装过程中进行了现场测量，以研究在安装过程中作用在桩上的内应力和外应力。在安装过程中，测量了单桩的锥突阻力，监测了桩顶的加速度和应变，预测了桩的承载力。安装方法有振动打桩和冲击打桩两种。结果表明：冲击打入过程中，桩内水平应力显著增大，形成土塞；在振动打桩过程中，没有观察到应力增加。
Soil plugging in open-ended piles leads to an increase in compressive bearing capacity but also influences pile driving resistance. Many different factors affect the tendency for soil plugging, for example, pile diameter, penetration depth and installation method. In this paper, the influence of the installation method on soil plugging is investigated. In situ measurements during the installation of two instrumented tubular piles are carried out to investigate the internal and external stresses acting on the pile during the installation process. Furthermore, the cone penetration resistance inside one pile is measured during the installation, and the accelerations and strains at the pile head are monitored to predict the bearing capacity. The installation method is varied between vibratory and impact pile driving. The results show that a significant increase in horizontal stresses inside the pile occurs during impact driving which leads to the conclusion that a soil plug is formed. During vibratory pile driving, no stress increase was observed.