摘要
当海上风电高压海缆登陆后跨越平原淤泥质海岸时,由于不均匀沉降,其高压电缆排管容易裂损破坏。螺旋桩施工方便,安装速度快,可用于不均匀沉降的应急控制。螺旋桩的安装扭矩是其工程应用的重要设计内容,其螺旋贯入过程中的周围土体产生了土体强度的扰动弱化,对安装扭矩计算的准确性有着较大影响。结合工程实践,通过有限元软件动态模拟螺旋桩贯入全过程,以等效塑性应变为判据量化安装后桩周土体扰动程度,创新性地提出扰动折减系数法,为计算扰动弱化后的土体强度提供了新方法。结果表明:对螺旋桩安装过程进行三维有限元模拟是可行的,同时也可以定量分析桩周土体扰动程度空间分布的动态变化,从而更科学地预测螺旋桩安装的施工关键控制参数。
When the high-voltage cables of offshore wind power are installed crossing the plain and muddy coast, the concrete duct for high-voltage cables tends to crack due to uneven settlement. Helix piles can be used for emergency control of uneven settlement because of its convenient construction and fast installation. The calculation of installation torque of helix pile is an important design content of its engineering application, and the disturbance weakening of soil strength around helix piles has a great impact on its required minimum installation torque. Therefore, combined with engineering practice, using finite element analysis, this paper studies and calculates the disturbance weakening vallum of soil strength around helix piles on the basis of PEEQ(i.e. parameter name of equivalent plastic strain in software ABAQUS), and the whole installation of helix piles could be represented by FEM simulations using the disturbance reduction coefficient method. The results show that it is feasible to conduct three-dimensional finite element simulation of the installation process of helix piles, and it can also help to quantitatively analyze the dynamic changes of spatial distribution of soil disturbance around the pile, so as to more scientifically predict the key control parameters during the installation of helix piles.
作者
张国峰
尹军杰
陈程
吴伟强
王忠岱
谢立全
ZHANG Guofeng;YIN Junjie;CHEN Cheng;WU Weiqiang;WANG Zhongdai;XIE Liquan(HECIC Offshore Wind Power Co.,Ltd.,Tangshan 063000,China;School of Transportation Engineering,Tongji University,Shanghai 201804,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期2567-2571,共5页
Building Structure
基金
国家自然科学基金面上项目“基于侧振减阻的吸力式基础沉贯纠偏机制与试验研究”(51479137)
