CPT-based design procedure for installation torque prediction for screw piles installed in sand.
CPT-based design procedure for installation torque prediction for screw piles installed in sand.
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DOI：
10.3723/osig17.346
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
T. Al-Baghdadi;C. Davidson;Michael Brown;J. Knappett;A. Brennan;C. Augarde;W. Coombs;Lei Wang;D. Richards;A. Blake
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文献类型：
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作者：
T. Al-Baghdadi;C. Davidson;Michael Brown;J. Knappett;A. Brennan;C. Augarde;W. Coombs;Lei Wang;D. Richards;A. Blake
螺旋桩作为陆上工程的基础，因其具有较高的抗压、抗拉能力，并能在安装过程中减少噪音和振动，被广泛应用于陆上工程。这些类型的桩已被提议作为更深水域中海上风力涡轮机的潜在创新基础。为了采用螺旋桩技术作为海上基础，需要扩大桩的几何尺寸，使其能够提供这一应用所需的高容量。这种尺寸和几何形状的变化将导致在不同土壤类型和应力历史中预测安装所需扭矩的不确定性。如果没有准确预测安装扭矩的能力，就很难设计用于海上使用的螺旋桩，或者开发在不同土壤中具有所需扭矩能力的适当安装工厂。本文介绍了螺纹桩的离心机试验结果和密砂中的静力触探试验结果。将安装扭矩(T)与锥体阻力Qc相关联，建立了一种基于CPT的设计方法，以预测修改后的螺旋桩几何形状所需的安装扭矩。
Screw piles (helical piles) have been used widely as foundations for onshore projects due to their ability to provide high compressive and tensile resistance as well as reduced noise/vibration during installation. These types of piles have been proposed as a potential innovative foundation for offshore wind turbines in deeper water. In order to adopt the screw pile technique as an offshore foundation, the geometry of the piles would need to be scaled up so they can provide the high capacities required for this application. Such a change in size and geometry will lead to uncertainties in predicting the required torque for installation in different soil types and stress histories. Without the ability to accurately predict installation torque it is difficult to design screw piles for offshore use or develop appropriate installation plant with the required torque capabilities in different soils. This paper presents centrifuge test results of screw piles and CPT tests undertaken in dense sand. The installation torque (T) has been correlated to the cone resistance qc to establish a proposed CPT-based design method to predict the required installation torque for modified screw pile geometries.