深海SCR触地管道与土体水平向作用离心模型试验研究  

Centrifugal model test on horizontal interaction between deep-sea SCR touchdown zone and the seabed

作　　者：何宁[1] 安晓宇[2,3] 刘洋[4] 任庆伟[5] 孟毅 HE Ning;AN Xiao-yu;LIU Yang;REN Qing-wei;MENG Yi(CNOOC Offshore Oil Engineering Co. Ltd., Tianjin 300451,China;Tianjin Research Institute for Water Transport Engineering,National Engineering Research Center of Port Hydraulic Construction Technology,Tianjin 300456,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;National Institute of Metrology, Beijing 100029, China;TEDA Industrial Development Corporation, Tianjin 300457, China)

机构地区：[1]海洋石油工程股份有限公司,天津300451 [2]交通运输部天津水运工程科学研究所港口水工建筑技术国家工程研究中心,天津300456 [3]天津大学水利工程仿真和安全国家重点实验室,天津300072 [4]中国计量科学研究院,北京100029 [5]天津泰达产业发展集团有限公司,天津300457

出　　处：《水道港口》2022年第2期246-251,共6页Journal of Waterway and Harbor

基　　金：2020年度交通运输行业重点科技项目(2020-MS1-030);中央级公益性科研院所科研创新基金项目(TKS20200309)。

摘　　要：针对深海钢悬链线立管系统流线段与土体相互作用问题,采用离心模型试验方法开展管道多次水平向运动循环试验,揭示了考虑淤泥层的管土相互作用机制及破土抗力发挥规律。结果表明:首次推管可以发现,由于软弱淤泥层的存在,土体抗力曲线均随位移呈现硬化型曲线,在滑移距离为0.1 D左右时达到破土状态,安装工况、水压试验工况和操作工况对应的破土抗力分别为3.45 kN、4.28 kN和3.78 kN,在破土抗力后管道持续下扎,土拱不断扩大,破土抗力以后的侧向抗力持续增加,呈现重管特征,当最大位移(X/D=2.5)时对三个工况的侧向抗力分别为9.07 kN、12.07 kN和9.97 kN;随后的往复推管过程中可以发现,随着首次推管淤泥层消散,管道接触土体强度增强,管土作用曲线呈轻管特征,在滑移距离为(0.7~1)D时出现峰值抗力,随着往复推管次数的增加,由于土拱范围的累积增大,峰值土体抗力逐渐增加,平均增长幅度不超过25%。Aiming at the interaction between the flow line segment and the soil in the deep-sea steel catenary riser system,the centrifuge model test method was used to carry out several horizontal movement cycle tests of the pipeline,which revealed the interaction mechanism between the pipeline and the soil considering the silt layer and the law of ground breaking resistance.The results show that for the first time,it can be found that due to the existence of weak silt layer,soil resistance curves all show a hardening curve with displacement.Reach the ground breaking state when the slip distance is about 0.1 D,the ground breaking resistance corresponding to installation condition,hydraulic test condition and operation condition is 3.45 kN,4.28 kN and 3.78 kN respectively.After the ground breaking resistance,the pipeline continues to be tied down,the soil arch continues to expand,the lateral resistance continues to increase after the ground breaking resistance,showing the characteristics of heavy pipe.When the maximum displacement(X/D=5),the lateral resistance to the three working conditions is 9.07 kN,12.07 kN and 9.97 kN respectively;in the process of reciprocating pipe pushing,it can be found that with the dissipation of the silt layer of the first pipe pushing,the strength of the pipe in contact with the soil is enhanced,the pipe-soil interaction curve shows the characteristics of light pipe,and the peak resistance appears when the sliding distance is about 0.7-1 D.With the increase of the number of reciprocating pipe pushing,due to the accumulation of the soil arch range,the peak soil resistance gradually increased,and the average growth rate did not exceed 25%.

关 键 词：钢悬链线立管(SCR) 管土相互作用 离心模型试验 土体抗力 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]