Estimation of Shear Demands on Rock Socketed Drilled Shafts subjected to Lateral Loading
Estimation of Shear Demands on Rock Socketed Drilled Shafts subjected to Lateral Loading
复制标题
承受侧向载荷的嵌岩钻杆剪切需求的估算
DOI：
10.55461/nsos1322
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Christopher McGann
中科院分区：
文献类型：
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作者：
Pedro Arduino;Long Chen;Christopher McGann
本报告介绍了一项评估研究的结果，即当前设计方法(基于p-y曲线)对嵌岩大直径竖井的适用性，以及在当前设计方法中未考虑的增强力矩传递机制的识别。为此，研究了简化模型和可能的三维(3D)有限元模型，以揭示岩石中的钻井井筒的响应。采用p-y法进行参数研究，考虑了不同的岩石性质和岩石埋深，提出了不同的土体和岩石p-y曲线的定义准则、不同的梁理论和不同的界面摩擦阻力，并与三维有限元模拟结果进行了比较。讨论了一种新的单元来考虑竖井底部与下伏岩石的相互作用，该单元可以在承台较浅的情况下减少剪切需求。
This report presents results of an evaluation study on the applicability of current design procedures (based on p-y curves) to the analysis of large-diameter shafts socketed in rock, and the identification of enhanced moment transfer mechanisms not considered in current design methodologies. For this purpose simplified models, and possible three-dimensional (3D) finite-element method (FEM) models are studied to shed some light on the response of drilled shafts socketed in rock. A parametric study using p-y and considering a wide range of rock properties and rock-socket depths, different criteria to define the soil and rock p-y curves, different beam theories, and different interface frictional resistances are presented and compared with 3D FEM simulations. A new element is discussed to account for the shaft toe and underlain rock interaction, which could provide benefit to reduce shear demands when the socket is shallow.