Structure Analysis Of Single-Pile Platform With Group Piles Foundation

There are long coastlines in our country. The petroleum resources reserves of thecoastal continental shelf are very abundant. Therefore, it is very important to find anappropriate platform structure pattern which can be applied to the beach oil fieldexploitation. One of the hot spots that the ocean engineering academia pay attention toin recent years is the minimum platform . This kind of platform has the traits of lowercost, shorter time of fabrication and smaller construction degree of difficulty.The single-pile offshore platform is one of types of the minimum platform. Theplatform has excellence on building cycle, few amount of steel used and have betterdevelopment prospects. But the top structure rocks too big when the platform is underthe environment of abominable sea state. This problem not only has influenced thenormal production but also has a potential safety hazard. The content of this paper isto change the single pile foundation of the single-pile platform, and adopt the modelstructure of a pattern with group piles foundation in order to control platform toprocking and reduce displacement.The single-pile platform with group piles foundation is a category of pilefoundation jacket platform. The paper has studied the work performance of pilebearing the level load,and chooses P-y curve law to calculate the pile-soilinteraction among the existing analytical methods. The nonlinear finite elementCOMBIN39 which is the spring elment of finite elment software ANSYS is adoptedto simulate the interaction between the pile and soil. The paper utilizes the software toset up the analyses model of platform. Under three service conditions,includingnormal and extrem wave and ocean current conditions,extrem sea-ice condition, thepaper calculates the statics and transient dynamics of the platform. On the basis ofresult,the paper concludes that the single pile platform with group piles foundationhas obvious advantange of the control of top structure rock and reduction ofdisplacement. The results also indicates that the double piles foundation platform ismore attractive and a comparatively ideal platform structure mode than three pilesfoundation according to cost and construction difficulty. The study of this text isimportant practical value to the development of the minimum platform of beach oilfield of our country.