海底真空管道合理支撑间距测算模型与数值分析
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摘要
海底真空管道(SVT)是一种适合穿越海峡、海湾的新型交通方式,其特征是在海床上每隔一定距离修建管墩,其上铺设管道,管道内抽成真空,供车辆高速行驶。由于海水对管道具有浮力作用,有效抵消管道重力荷载,减轻管道弯曲应力,使得管墩对管道的支撑间距可以较大。根据海底真空管道断面结构,分析管道固有频率取值,建立基于刚度条件和基于强度条件的支撑间距测算模型,计算管道自身静荷载、海水浮力荷载,推导单位长度上车辆许允重量算法,进而建立基于车辆动荷载的最大支撑间距计算模型。依据各模型,按钢质管道管径2～3. 4 m,管壁厚度10～30 mm,计算管道最大支撑间距,并进行数值分析。海底真空管道管墩合理支撑间距大于100 m,最大可达500 m,必要时中间加设张力腿。主要制约因素不在管道强度方面,而在于管墩抗压、抗拔和抗横向作用力的能力。提出海底真空管道预浮力法和预重力法概念以及管道设计原理。
Mechanical properties of Seabed Vacuum Tube( SVT) supported by piers,an advanced transportation across straits and bays,were mathematically formulated with static/dynamic models,theoretically analyzed in material mechanics and numerically simulated to estimate the support-span. The influence of the realistic situation,including but not limited to the dimensions/natural-frequency/weight/mechanical-behavior of tube,depth/floatingload/current of sea-water,and load/speed of trains,on support-span was investigated. The steel tube,2 ～ 3. 4 m in diameter and 10 ～ 30 mm in thickness,was exemplified in the calculation. The analyzed and simulated results show that the reasonable support-span should be longer than 100,500 m at most. If necessary,tension legs between piers significantly increase the support-span. Moreover,we found that the support-span depends strongly on pier's resistances against the pressure/extraction-force/transversal-force,but weakly on the tube mechanical strength.
Mechanical properties of Seabed Vacuum Tube( SVT) supported by piers,an advanced transportation across straits and bays,were mathematically formulated with static/dynamic models,theoretically analyzed in material mechanics and numerically simulated to estimate the support-span. The influence of the realistic situation,including but not limited to the dimensions/natural-frequency/weight/mechanical-behavior of tube,depth/floatingload/current of sea-water,and load/speed of trains,on support-span was investigated. The steel tube,2 ～ 3. 4 m in diameter and 10 ～ 30 mm in thickness,was exemplified in the calculation. The analyzed and simulated results show that the reasonable support-span should be longer than 100,500 m at most. If necessary,tension legs between piers significantly increase the support-span. Moreover,we found that the support-span depends strongly on pier's resistances against the pressure/extraction-force/transversal-force,but weakly on the tube mechanical strength.
引文
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[19] Ding Hao,Li Qinxi,Jiang Shuping,et al. Research Progress and Outlook on Critical Characteristics of SFT[J]. Procedia Engineering,2016,166:347-354
[2] ZHANG Yaoping. Vacuum Tube Transport:An Effective Solution to Global Transport Dilemma[J]. Imperial Journal of Interdisciplinary Research(IJIR),2016(12):921-930
[3] ZHANG Yaoping. Evacuated Tube Transportation Routes:Go Through Overhead,on Ground,Shallow Underground or Deeply Underground[J]. CTEE 2012,Nanjing,2012,18:287-292
[4]张耀平.台湾海峡海底真空管道交通线路方案研究[J].西京学院学报,2017,15(4):11-17
[5]张耀平.一种用于支撑连接海底真空管道的多功能空心人工岛塔[P].中国:CN201711042785. 9,2017-10
[6] Martire G,Faggiano B,Mazzolani F M,et al. Seismic Analysis of a SFT Solution for the Messina Strait Crossing[C]. Procedia Engineering 4,2010,(7):303-310
[7] Shunji Kanie. Feasibility Studies on Various SFT in Japan and Their Technological Evaluation[C]. Procedia Engineering 4,2010,(7):13-20
[8]高荣江.刚性支承潜浮隧道[J].隧道建设,2011,31(5):529-535
[9] Bernt Jakobsen. Design of the Submerged Floating Tunnel Operating Under Various Conditions[C]. Procedia Engineering 4,2010,(7):71-79
[10] Havard Qstlid. When is SFT Competitive[C]. Procedia Engineering 4,2010,(7):3-11
[11]麦继婷.波流作用下悬浮隧道的响应研究[D].成都:西南交通大学,2005. 6
[12]秦银刚,周生国,周晓军.多跨悬浮隧道合理支撑间距分析[J].铁道工程学报,2008,114(3):78-81
[13] Singiresu S. Rao[美].机械振动(第5版)[M].李欣业,杨理诚译.北京:清华大学出版社,2016
[14]宋岢岢.工业管道分析与工程应用[M].北京:中国石化出版社,2011
[15]闫晓鹏,武瑛.材料力学[M].北京:清华大学出版社,2013:56-57
[16]施振球,赵廷元.动力管道设计手册[M].北京:机械工业出版社,2007
[17] ET3 Global Inc. http://www. et3. com,2018-04
[18]冯士筰,李凤岐,李少菁.海洋科学导论[M].北京:高等教育出版社,2002:181-188
[19] Ding Hao,Li Qinxi,Jiang Shuping,et al. Research Progress and Outlook on Critical Characteristics of SFT[J]. Procedia Engineering,2016,166:347-354
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