本文選題：自升式平臺 + 螺殼�。� 參考：《江蘇科技大學》2017年碩士論文

【摘要】：現(xiàn)役自升式平臺存在樁土連接剛度低、刺穿和滑移事故率高、拔樁阻力大等問題,無法滿足鉆井作業(yè)深水化趨勢及工作安全性要求。為此,提出“復合仿生”理念,基于螺殼獨特的膨脹層特性和蛋殼優(yōu)異的流線型結構,開展自升式平臺仿生樁靴設計與作業(yè)評估,具體研究內(nèi)容如下:(1)以螺殼表面螺旋部、縫合線以及蛋殼輪廓形狀為基礎,開展輪廓掃描試驗,分別對兩者的形狀特征進行統(tǒng)計;通過Hypermesh軟件提取特征點,利用Origin軟件推導并擬合出符合要求的兩種螺旋線、體螺層曲線以及蛋殼輪廓線的數(shù)學表達式;最后結合Matlab軟件和皮爾遜相關系數(shù)對擬合出的曲線進行驗證,保證曲線與生物原型的高度吻合。(2)通過分析現(xiàn)有的樁靴承載力理論公式,研究單層、多層地基的插樁阻力;接著運用孔擴張理論推導出基于SMP準則的插樁阻力,并與土工試驗進行對比;然后分析國內(nèi)外拔樁阻力的理論公式;最后對理論公式在實際應用和仿生樁靴中的可行性進行分析。(3)結合體螺層特點及函數(shù),構建樁靴下半部分的螺殼形仿生模型;結合蛋殼鈍端特點及蛋形函數(shù),構建樁靴上半部分蛋形仿生模型。研究螺殼形仿生模型與蛋形仿生模型之間的復合機制,進而建立“螺殼-蛋殼”形樁靴復合仿生模型。運用仿生樁靴與土壤耦合力學行為分析方法,利用Abaqus數(shù)值分析方法,分析“螺殼-蛋殼”形仿生樁靴插樁工況下的插樁載荷與深度的定性關系。最后在后處理過程中研究插樁工況下土壤流動失效模式,并分析土壤流動失效對插樁載荷的影響機制。(4)利用Abaqus數(shù)值分析方法,在不考慮滲流-應力耦合情況下研究拔樁阻力變化,并與在滲流-應力耦合情況下的插樁阻力進行對比。其次,通過有限元方法,研究兩種樁靴上下表面的孔隙壓力變化;最后,研究拔樁工況下土壤流動失效模式,并分析土壤流動失效對拔樁載荷的影響機制。
[Abstract]:There are some problems such as low stiffness of pile-soil connection, high accident rate of puncture and slip, and large resistance of pulling pile, which can not meet the requirements of deepwater drilling operation and safety. Therefore, the idea of "composite bionics" is put forward. Based on the unique characteristics of the expansion layer of the shell and the excellent streamlined structure of the shell, the design and operation evaluation of the bionic pile boots of the jack-up platform are carried out. The specific research contents are as follows: 1) the helical part of the spiral surface of the spiral shell. On the basis of suture line and eggshell contour shape, the contour scanning test is carried out, and the shape characteristics of the two lines are statistically analyzed. The feature points are extracted by Hypermesh software, and the two helical lines that meet the requirements are deduced and fitted by Origin software. The mathematical expressions of the snail curve and the eggshell contours are given. Finally, the fitting curves are verified with Matlab software and Pearson correlation coefficient. By analyzing the existing theoretical formulas of bearing capacity of pile boots, the pile insertion resistance of single-layer and multi-layer foundation is studied, and then the pile insertion resistance based on SMP criterion is derived by using the hole expansion theory. And compared with the geotechnical test, then analyzed the theoretical formula of pulling pile resistance at home and abroad, finally analyzed the practical application and feasibility of bionic pile boots. The snail shell bionic model of the bottom half of the pile shoe is constructed, and the egg shape bionic model of the upper half of the pile shoe is constructed by combining the characteristics of the shell blunt end and the egg shape function. The composite mechanism between the snail shell bionic model and the eggshell bionic model is studied, and the composite bionic model of the "snail shell-eggshell" pile shoe is established. By using the method of bionic pile boots and soil coupling mechanical behavior analysis and using Abaqus numerical analysis method, the qualitative relationship between the load and the depth of the inserted pile under the condition of "screw shell and eggshell" type bionic pile boots was analyzed. Finally, the failure mode of soil flow under the condition of pile insertion is studied in the post-treatment process, and the influence mechanism of soil flow failure on the load of pile insertion is analyzed. (4) Abaqus numerical analysis method is used. The variation of pile pulling resistance is studied without considering seepage and stress coupling and compared with that of pile insertion under seepage stress coupling. Secondly, the change of pore pressure on the upper and lower surface of two kinds of pile boots is studied by finite element method. Finally, the failure mode of soil flow under the condition of pile pulling is studied, and the influence mechanism of soil flow failure on pile pulling load is analyzed.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU473.1

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本文編號：1803683