Effect of Loading Rate on Lateral Pile-Soil Interaction in Sand Considering Partially Drained Condition

作     者：ZHU Bin REN Jie WU Lei-ye KONG De-qiong YE Guan-lin YANG Qingjie LAI Ying ZHU Bin;REN Jie;WU Lei-ye;KONG De-qiong;YE Guan-lin;YANG Qing-jie;LAI Ying

作者机构：MOE Key Laboratory of Soft Soils and Geoenvironmental EngineeringZhejiang UniversityHangzhou 310058China College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou 310058China Center for Hypergravity Experimental and Interdisciplinary ResearchZhejiang UniversityHangzhou 310058China Department of Civil EngineeringShanghai Jiao Tong UniversityShanghai 200030China Key Laboratory of Ministry of Education for Geomechanics and Embankment EngineeringDepartment of Civil EngineeringHohai UniversityNanjing 210098China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2020年第34卷第6期

页      面：772-783页

核心收录：

学科分类：080801[工学-电机与电器] 081505[工学-港口、海岸及近海工程] 0808[工学-电气工程] 081401[工学-岩土工程] 08[工学] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 082401[工学-船舶与海洋结构物设计制造] 

基　　金：financially supported by the National Natural Science Foundation of China (Grant Nos. 51988101 and 51679211) 

主　　题：monopiles partially drained loading rate excess pore pressure 

摘      要：Reliable assessment of the lateral pile–soil interaction is of pronounced importance for the design of mono-pile foundations of offshore wind turbines. As the offshore engineering moves to deeper waters, the diameter of monopiles is getting larger, usually about 5 m and could be up to 8 m, which may lead to partially drained behaviors of sand in the vicinity of the pile and thus imply limitations of conventional design methods in which fully drained conditions were assumed. To shed light on this issue, a fully-coupled finite element model was established using an in-house developed finite element code DBLEAVES, incorporating a cyclic mobility constitutive model that is capable of describing the instantaneous contractive and dilative response of sands simultaneously. Triaxial and centrifuge model tests were conducted to calibrate the constitutive model and validate the pile–soil interaction model respectively. This is followed by a parametric study primarily focusing on the effects of loading rates. The initial stiffness of the p–y curve was found to increase with the loading rate whilst the bearing capacity showed the inverse,and the mechanism behind this phenomenon is examined in detail. Then an explicit model was developed to evaluate the development of excess pore pressure in the pile front upon lateral loading, and an upper boundary of normalized loading rate was identified to distinguish fully and partially drained conditions.