| 塑性极限分析鱼雷锚锚尖贯入阻力 |
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| 引用本文： | 瑜璐,杨庆,杨钢,张金利.塑性极限分析鱼雷锚锚尖贯入阻力[J].岩土力学,2020,41(6):1953-1962. |
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| 作者姓名： | 瑜璐 杨庆 杨钢 张金利 |
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| 作者单位： | 大连理工大学 海岸与近海工程国家重点实验室，辽宁 大连 116023 |
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| 基金项目： | 国家重点研发计划（No.2016YFE0200100）；国家自然科学基金重点项目（No.51639002）；国家自然科学基金面上项目（No.41572252）。 |
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| 摘 要： | 鱼雷锚安装过程中,锚尖形状影响尖部贯入阻力进而影响贯入深度。基于塑性极限分析理论下限法分析不同锚尖长径比x的椭圆形锚尖的贯入阻力和贯入阻力系数,并考虑了贯入深度、锚-土界面摩擦对贯入阻力以及贯入阻力系数的影响。结果表明:(1)锚-土界面光滑时,锚尖贯入阻力系数随着锚尖长径比的增大而减小;锚-土界面粗糙时,锚尖贯入阻力系数随着锚尖长径比的增大而增大。(2)摩擦力对贯入阻力系数的影响随着ξ增大而增大。(3)随着埋置深度增加,贯入阻力系数受x影响最小时所对应的摩擦系数逐渐减小。(4)当锚-土界面摩擦系数ω 0.75时,工程中可选用ξ1的锚尖用以减小端部贯入阻力;当ω0.26时,ξ1的锚尖提供更小的端部贯入阻力。锚尖长径比ξ=0和ξ=1的下限解与前人研究的桩基和圆形结构的理论解较为一致,进一步验证了所提出的椭圆形锚尖下限法模型的可行性。
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| 关 键 词： | 鱼雷锚 椭圆型锚尖 不排水抗剪强度 黏土 埋置深度 |
| 收稿时间： | 2019-07-05 |
| 修稿时间： | 2019-11-22 |
Analysis of the resistance of elliptical tip of torpedo anchor by
plastic limit analysis |
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| YU Lu,YANG Qing,YANG Gang,ZHANG Jin-li.Analysis of the resistance of elliptical tip of torpedo anchor by
plastic limit analysis[J].Rock and Soil Mechanics,2020,41(6):1953-1962. |
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| Authors: | YU Lu YANG Qing YANG Gang ZHANG Jin-li |
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| Institution: | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116023, China |
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| Abstract: | During installing procedures of torpedo anchors, tip-shape of the torpedo anchor affects penetration resistance and depth. In this study, the lower bound method of the plastic limit analysis theory is used to analyze the penetration resistance and penetration resistance coefficient for different aspect ratios of the elliptical-tip of torpedo anchor (ξ), embedment depth, and friction coefficient of anchor-soil. A series of results is obtained: 1) If a soil-anchor interface is smooth, the penetration resistance coefficient decreases with increasing the aspect ratio of torpedo anchor tip; for the rough interface of soil-anchor, the penetration resistance coefficient increases with increasing the aspect ratio. 2) The influence of the friction force markedly increases with increasing ξ due to a larger interfacial area. 3) With increasing embedment depth, the friction coefficient reduces gradually, which corresponding penetration resistance coefficient is minimally impacted by various ξ. 4) If the friction coefficient ? is larger than 0.75, the anchor tip with the aspect ratio less than 1 responds to smaller bearing capacity; and while the friction coefficient is less than 0.26, the smaller bearing capacity is provided by the anchor tip following aspect ratios greater than 1. The lower bound results of ξ = 0 and 1 show good consistent with the previous solutions for strip foundation and circular structure, which verify the lower bound method of elliptical-tip of the torpedo anchor is reasonable. |
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| Keywords: | torpedo anchor elliptical tip undrained shear strength clay embedment depth |
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