本文選題：吸力式沉箱　切入點：離心試驗　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：能源是現(xiàn)代化進程的基礎(chǔ)和支柱,現(xiàn)代化腳步日益加快的今天,人們對能源也越來越依賴,然而陸地上蘊藏能源逐漸較少,開發(fā)成本也越來越高,因此人們開始將視線投放到能源豐富的近海區(qū)域。吸力式沉箱基礎(chǔ)是較為常見的近海結(jié)構(gòu)物的基礎(chǔ)形式之一,因其具有施工安裝費用相對較低、運輸和安裝相對較為方便、能夠重復(fù)使用、對場地勘察要求低以及施工時間短等優(yōu)點,逐步得到了廣泛應(yīng)用,其相關(guān)的科學(xué)問題已成為近20年的研究熱點之一 論文主要針對飽和密砂地基中吸力式沉箱基礎(chǔ)的抗拉承載特性開展離心模型實驗,并歸納變化規(guī)律。本文首先介紹了離心模型實驗的優(yōu)缺點和適用范圍,隨后詳細描述了吸力式沉箱抗拉承載力的離心模型實驗過程,并較全面論述了實驗中所使用儀器設(shè)備的精度和穩(wěn)定性；通過對實驗結(jié)果的分析,重點討論了荷載作用位置、荷載作用角度以及砂土相對密實度對沉箱抗拉承載力的影響,給出了斜拉荷載作用下沉箱轉(zhuǎn)動中心位置的所在范圍,討論了沉箱承載性能隨外荷載的作用角度和位置變動的發(fā)展規(guī)律,給出了斜拉荷載作用下沉箱箱頂?shù)奈灰迫^程,最終提出了指定工況條件下的最優(yōu)荷載作用位置和角度。結(jié)合荷載-時間曲線討論了沉箱抗豎向拉承載力的組成,提出了斜拉荷載作用下沉箱抗拉承載力的三個階段,論述了三個階段的沉箱的受力特點,建議了沉箱抗拉控制承載力的選取依據(jù)。 整個離心模型實驗過程包括地基土砂樣的制備、砂土地基的飽和、1g條件下沉箱模型的貫入、傳感器的布置等步驟�？紤]到實驗過程中裝配操作和儀器測量所引起的實驗誤差在所難免,文中詳細分析了實驗中存在的誤差,同時提出了控制誤差的方法。
[Abstract]:Energy is the foundation and pillar of the modernization process. Today, with the acceleration of modernization, people are more and more dependent on energy. However, there is less energy in the land, and the development cost is higher and higher. The suction caisson foundation is one of the most common foundation forms of offshore structures, because of its relatively low cost of construction and installation, it is relatively convenient to transport and install. The advantages of being reusable, low requirement for site investigation and short construction time have gradually been widely used, and the related scientific problems have become one of the research hotspots in the past 20 years. In this paper, the centrifugal model experiment is carried out in accordance with the tensile bearing characteristics of suction caisson foundation in saturated dense sand foundation, and the variation law is summarized. Firstly, the advantages and disadvantages of centrifugal model experiment and its application range are introduced in this paper. Then, the centrifugal model experiment process of suction caisson's tensile capacity is described in detail, and the precision and stability of the instruments and equipments used in the experiment are discussed comprehensively, and the position of load action is discussed emphatically through the analysis of the experimental results. The influence of load angle and the relative density of sand on the tensile bearing capacity of caisson is given. The range of the center of caisson rotation under the action of cable-stayed load is given. This paper discusses the development law of caisson's bearing capacity changing with the action angle and position of external load, and gives the whole process of caisson roof displacement under the action of cable-stayed load. Finally, the optimal load position and angle under specified working conditions are put forward. The composition of vertical tensile capacity of caisson is discussed in combination with load-time curve, and the three stages of tensile bearing capacity of caisson under cable-stayed load are put forward. The stress characteristics of the caisson in three stages are discussed, and the selection basis of the bearing capacity of the caisson under tension control is suggested. The whole process of centrifugal model experiment includes the preparation of sand sample of foundation soil, the penetration of caisson model under saturated 1 g of sand foundation. Considering that the experiment error caused by assembly operation and instrument measurement is unavoidable, the errors in the experiment are analyzed in detail, and the method of controlling the error is put forward.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U655.544

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