【摘要】：自升式平臺(tái)是近海油氣田開(kāi)發(fā)中廣泛使用的平臺(tái)結(jié)構(gòu)型式。由于海底地質(zhì)條件復(fù)雜,平臺(tái)在上硬下軟的地基上插樁時(shí),經(jīng)常會(huì)發(fā)生穿刺事故,嚴(yán)重威脅著平臺(tái)生產(chǎn)作業(yè)的安全。本文以渤海十二號(hào)自升式鉆井平臺(tái)為研究對(duì)象,對(duì)方形樁靴的單層及雙層地基極限承載力進(jìn)行了深入的理論分析,并對(duì)平臺(tái)預(yù)壓載求解方法及穿刺過(guò)程中的結(jié)構(gòu)響應(yīng)進(jìn)行了研究,主要研究?jī)?nèi)容包括： 1、構(gòu)造了方形樁靴三維地基復(fù)合滑移破壞面,并根據(jù)極限平衡理論,由塑性體的平衡條件推導(dǎo)出一種新的方形樁靴單層地基承載力計(jì)算公式。 2、以邁耶霍夫-漢納沖剪理論為基礎(chǔ),對(duì)雙層地基土體破壞面提出了合理的假設(shè),建立了一種新的方形樁靴雙層地基承載力的計(jì)算方法。 3、為準(zhǔn)確判斷發(fā)生穿刺的可能性,提出了一種基于動(dòng)力分析的計(jì)算平臺(tái)預(yù)壓載的科學(xué)方法,該方法的計(jì)算結(jié)果比現(xiàn)有工程方法更接近實(shí)際情況,從而可有效避免結(jié)構(gòu)發(fā)生穿刺。 4、針對(duì)平臺(tái)穿刺,建立了方形樁靴自升式平臺(tái)有限元分析模型,并就三種穿刺工況分析了穿刺前后的樁腿及船體形態(tài)、危險(xiǎn)點(diǎn)分布、穿刺速度對(duì)結(jié)構(gòu)的影響及預(yù)壓載分布的變化,首次探討了自升式平臺(tái)穿刺過(guò)程中的結(jié)構(gòu)響應(yīng)特征；并通過(guò)計(jì)算平臺(tái)極限穿刺深度,評(píng)估了平臺(tái)的抗穿刺能力。
[Abstract]:The jack-up platform is widely used in offshore oil and gas field development. Because of the complex geological conditions of the seabed, when the platform inserts piles on the hard and soft foundation, there are often puncture accidents, which seriously threaten the safety of the platform production. Taking the jack-up drilling platform No. 12 in Bohai Sea as the research object, the ultimate bearing capacity of single-layer and double-layer foundation of square pile boots is analyzed theoretically in this paper. The calculation method of preloading load of platform and the structural response in the process of puncture are studied. The main research contents are as follows: 1. The composite sliding failure surface of square pile boots is constructed, and according to the limit equilibrium theory, A new formula for calculating the bearing capacity of single layer foundation of square pile boots is derived from the equilibrium condition of plastic body. 2. On the basis of Mayehov-Hanna 's theory of flushing shear, a reasonable assumption is put forward for the failure surface of double-layered soil, and a new method for calculating the bearing capacity of double-layer foundation with square pile and boots is established. 3. In order to accurately judge the possibility of puncture, a scientific method for calculating preload of platform based on dynamic analysis is proposed. The calculation results of this method are closer to the actual situation than the existing engineering methods. Thus, the puncture of the structure can be avoided effectively. 4. For the platform puncture, the finite element analysis model of the platform is established, and the shape of the post leg and the hull before and after the puncture are analyzed, and the distribution of the dangerous point is analyzed according to the three kinds of puncture conditions. The influence of puncture speed on the structure and the change of preloading load distribution are discussed for the first time, the structural response characteristics in the process of jack-up platform puncture are discussed for the first time. The anti-puncture ability of the platform is evaluated by calculating the limit puncture depth of the platform.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU470

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