波流共同作用下海底人工边坡动态响应分析  

Dynamic response of artificial submarine slope under wave-current loading

作　　者：刘成林 陈炜昀[2] 陈国兴[2] 俞缙[3] LIU Chenglin;CHEN Weiyun;CHEN Guoxing;YU Jin(College of Harbor,Coastal and Offshore Engineering,Hohai Univerisity,Nanjing 210098,China;Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China;Civil Engineering Department,Huaqiao University,Xiamen 361021,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]南京工业大学岩土工程研究所,江苏南京210009 [3]华侨大学土木工程学院,福建厦门361021

出　　处：《海洋工程》2020年第6期107-116,共10页The Ocean Engineering

基　　金：国家自然科学基金(41877243,41502285);厦门市科技计划项目(3502Z20193040)。

摘　　要：为了研究波流共同荷载作用下开挖基槽附近海床动态响应和液化破坏情况,提出一个二维耦合计算模型,采用雷诺时均纳维-斯托克斯(RANS)方程描述波浪运动情况,通过设定侧边界条件实现稳定流场。海床部分通过求解Biot固结方程,得到波流荷载下海床中的应力和位移情况。将模型计算结果与水槽试验数据和解析解进行比较,验证了波流模型和海床模型的有效性。在此模型基础上,分析得到了开挖之后海床新的应力和固结状态。同时,通过参数分析得到了波流耦合情况下波浪形态的变化,以及海流对海床液化情况和孔压情况的影响。最后,通过线性回归计算得到最大液化深度与流速的拟合关系曲线。计算结果可用于判断基槽开挖后不规则海床的液化情况,对相关研究和实际工程具有一定参考意义。To investigate the dynamic response and liquefaction damage of the seabed around the excavated trench groove under combined wave-current load,an integrated 2-D numerical model is proposed,and the Reynolds-Averaged Navier-Stokes(RANS)equation is solved to simulate the wave field,meanwhile the stable current field is realized by setting boundary conditions.The stress and displacement in the seabed are obtained by solving the Biot's consolidation equation under wave current loading.To verify the validity of the wave-current model and the seabed model,this model’s results are compared with laboratory experimental data and analytical solution.Based on this model,the new stress and consolidation state of the excavated seabed is obtained.Meanwhile,through parameter analysis,the wave surface morphology changes under wave-current interaction are obtained,and the influence of current to seabed liquefaction and pore pressure is analyzed.Finally,the fitting curve between the maximum liquefaction depth and the current velocity is calculated by linear regression.The calculation results can be used to determine the liquefaction of the excavated irregular seabed,and may have certain reference value for related research and practical engineering.

关 键 词：波浪-海床耦合作用 波流相互作用 海床液化破坏 有效应力 水下人工边坡 

分 类 号：P754[天文地球—海洋科学]