摘要
为研究逆流沉排过程中软体排受力特性,基于排布只能承受拉应力的力学特性和几何非线性变形特点,采用非线性壳单元Shell181模拟排布,建立软体排沉排非线性有限元模型,与悬链线理论计算结果对比,验证了模型的准确性。分析现有研究中简化混凝土块的建模方法对计算结果的影响,利用验证后的模型对改进施工工艺后的张家洲洲头逆流沉排过程开展非线性有限元数值模拟。结果表明,沉排时排垫最大拉力出现在两侧1 m范围内,排垫两侧4 m长度的横向加筋带能有效降低撕排风险;排布和加筋带的抗拉安全系数均大于2,排体位移较小,施工方案安全有效。
To explore the mechanical properties of the flexible mattress in the process of counter flow sinking,based on the mechanical properties that the geotextiles can only withstand tensile stress and the geometric nonlinear deformation characteristics of the mattress,we establish the nonlinear finite element model of the flexible mattress by the nonlinear shell element Shell181 to simulate the geotextiles,and verify the the accuracy of the model by comparing with the catenary theoretical calculation results.We analyze the influence of the simplified concrete block modeling method in the existing research on the calculation results,and carry out the nonlinear finite element numerical simulation of the counter flow sinking process of Zhangjiazhou head after improving the construction process by the verified model.The results show that the maximum tension of the mattress appears within the range of 1 m on both sides during sinking process,and the lateral reinforcement bar with the length of 4 m on the edge of the mattress can effectively reduce the risk of tearing.The tensile safety factor of geotextiles and reinforcement bar is greater than 2,the displacement of flexible mattress is small,and the construction scheme is safe and effective.
作者
郑天宇
杨杰
陈一梅
ZHENG Tian-yu;YANG Jie;CHEN Yi-mei(Southeast University,Nanjing 211189,China;CCCC Shanghai Dredging Co.,Ltd.,Shanghai 200002,China)
出处
《水运工程》
北大核心
2022年第12期92-97,共6页
Port & Waterway Engineering
基金
国家重点研发计划项目(2018YFB1600400)。
关键词
软体排
逆流沉排
非线性有限元
排垫受力特性
数值模拟
flexible mattress
counter flow mattress sinking
nonlinear finite element
mechanical properties of geotextile
numerical simulation
