摘要
为确保重力锚在工程中的安全使用,基于弹塑性增量有限元方法,分析了波浪荷载作用下重力锚周围海床动力响应规律以及重力锚水平承载力的变化规律。通过分析发现:波浪荷载作用下,锚底土体超孔隙水压力呈波动式上升,累积超孔压比最高可达0.9左右,从而使土体有效应力减小导致重力锚的水平承载力下降;且锚前沿土体塑性应变随循环周次的增加而逐渐累积是重力锚的水平承载力下降的另一主要原因。并得出随着土体弹性模量、黏聚力和内摩擦角的增大,土体累积超孔压逐渐减小;弹性模量越大,重力锚前沿土体的累积塑性应变数值也越大;然而随着黏聚力和内摩擦角的增大,重力锚前沿土体的累积塑性应变数值在减小。
In order to ensure the safe use of the gravity anchor in engineering, the dynamic response law of the seabed that around the gravity anchor and the horizontal bearing capacity of gravity anchor are analyzed based on the elastoplastic incremental finite element method. The results show that under the wave loading, the excess pore water pressure of the seabed that under the anchor fluctuates and accumulates with the cycle number. The cumulative excess pore pressure ratio can reach up to 0.9 and the effective stress of the soil decreases which cause the reduction of the horizontal bearing capacity of the gravity anchor. Moreover, the plastic strain of the soil gradually accumulates with the cycle number which is the another main reason for the decrease of the horizontal bearing capacity. In addition, as the elastic modulus, cohesion and internal friction angle of the soil increase, the cumulative excess pore pressure decreases gradually. The larger the elastic modulus, the larger the cumulative plastic strain of the seabed at the front of the gravity anchor. However, as the cohesion and internal friction angles increase, the cumulative plastic strain decreases gradually.
作者
郝潇涵
唐小微
HAO Xiaohan;TANG Xiaowei(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116023,China)
出处
《水利与建筑工程学报》
2019年第1期148-153,共6页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金重点项目(51639002)
国家重点研发计划项目(2016YFE0200100)
关键词
波浪荷载
重力锚
有限元方法
水平承载力
动力响应
wave loading
gravity anchor
finite element method
horizontal bearing capacity
dynamic response
