方形桩靴自升式平台地基极限承载力及结构抗穿刺研究
发布时间：2018-10-30 19:01
【摘要】：自升式平台是近海油气田开发中广泛使用的平台结构型式。由于海底地质条件复杂,平台在上硬下软的地基上插桩时,经常会发生穿刺事故,严重威胁着平台生产作业的安全。本文以渤海十二号自升式钻井平台为研究对象,对方形桩靴的单层及双层地基极限承载力进行了深入的理论分析,并对平台预压载求解方法及穿刺过程中的结构响应进行了研究,主要研究内容包括： 1、构造了方形桩靴三维地基复合滑移破坏面,并根据极限平衡理论,由塑性体的平衡条件推导出一种新的方形桩靴单层地基承载力计算公式。 2、以迈耶霍夫-汉纳冲剪理论为基础,对双层地基土体破坏面提出了合理的假设,建立了一种新的方形桩靴双层地基承载力的计算方法。 3、为准确判断发生穿刺的可能性,提出了一种基于动力分析的计算平台预压载的科学方法,该方法的计算结果比现有工程方法更接近实际情况,从而可有效避免结构发生穿刺。 4、针对平台穿刺,建立了方形桩靴自升式平台有限元分析模型,并就三种穿刺工况分析了穿刺前后的桩腿及船体形态、危险点分布、穿刺速度对结构的影响及预压载分布的变化,首次探讨了自升式平台穿刺过程中的结构响应特征；并通过计算平台极限穿刺深度,评估了平台的抗穿刺能力。
[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.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU470
本文编号：2300892
[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.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU470
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