【摘要】：風(fēng)力發(fā)電基礎(chǔ)是風(fēng)力發(fā)電的重要組成部分,它承擔(dān)著上部結(jié)構(gòu)所承受的全部荷載與作用,使其能夠安全的傳遞到地基,并要保持整個(gè)結(jié)構(gòu)的穩(wěn)定性。隨著風(fēng)機(jī)塔筒高度逐漸的增加,風(fēng)機(jī)型號(hào)的加大,使得風(fēng)電基礎(chǔ)受力越來(lái)越復(fù)雜,而且,風(fēng)機(jī)基礎(chǔ)的結(jié)構(gòu)設(shè)計(jì)技術(shù)還不夠成熟,使得導(dǎo)致風(fēng)機(jī)整體傾覆、倒塌的事件時(shí)有發(fā)生,所以,對(duì)風(fēng)電基礎(chǔ)進(jìn)行詳細(xì)的受力特征分析與優(yōu)化設(shè)計(jì)研究是很有必要的。本文提出了一種風(fēng)電基礎(chǔ)—鋼管混凝土樁基礎(chǔ),通過(guò)對(duì)其理論分析,數(shù)值計(jì)算與軟件模擬,完成的主要工作如下： 介紹了近海風(fēng)電結(jié)構(gòu)基礎(chǔ)的主要類(lèi)型,分析了每種基礎(chǔ)類(lèi)型的優(yōu)缺點(diǎn),提出以鋼管混凝土樁作為近海風(fēng)電塔筒的樁基礎(chǔ)。 通過(guò)對(duì)單樁與土之間的相互作用機(jī)理,給出了曲線(xiàn)、分段線(xiàn)性及直線(xiàn)型剪應(yīng)力模型,提出了單樁的荷載與位移計(jì)算公式�？紤]到樁在受荷載過(guò)程中的樁身變形,給出了不同樁型的樁身壓縮系數(shù)與樁身壓縮量的計(jì)算公式。 分析了承臺(tái)下的群樁與土之間的相互作用,分別研究了方形承臺(tái)與圓形承臺(tái)下樁與土的荷載傳遞關(guān)系,建立了樁與周?chē)恋淖冃瘟坑?jì)算公式,樁影響半徑的計(jì)算公式。 以實(shí)際算例,計(jì)算分析了鋼管混凝土的抗拉、抗壓的承載力,并與實(shí)際受力情況進(jìn)行了對(duì)比,得到樁的影響半徑,群樁與土的沉降量,驗(yàn)算了承臺(tái)的抗沖切、抗傾覆及抗滑的安全性。 利用ABAQUS有限元軟件,分析了鋼管混凝土樁基礎(chǔ)的整體受力、變形及應(yīng)力分布。重點(diǎn)分析了受力最大的兩個(gè)樁的應(yīng)力沿路徑的變化,以及樁與土體變形最大一點(diǎn)的受拉、受壓狀態(tài)。
[Abstract]:Wind power generation foundation is an important part of wind power generation. It bears all the loads and functions of the superstructure, so that it can be safely transferred to the foundation, and the stability of the whole structure should be maintained. With the gradual increase of the height of the fan tower and the increase of the fan type, the force on the wind power foundation is becoming more and more complicated. Moreover, the structural design technology of the fan foundation is not mature enough, which causes the fan to overturn and collapse from time to time. Therefore, it is necessary to analyze the stress characteristics and optimize the design of wind power foundation in detail. In this paper, a kind of wind power foundation, concrete-filled steel tube (CFST) pile foundation, is proposed. Through theoretical analysis, numerical calculation and software simulation, the main work accomplished is as follows: the main types of offshore wind power structure foundation are introduced. The advantages and disadvantages of each foundation type are analyzed, and the concrete filled steel tube pile is proposed as the pile foundation of offshore wind power tower. Through the interaction mechanism between single pile and soil, the curve, piecewise linear and linear shear stress models are given, and the calculation formulas of load and displacement of single pile are presented. Considering the deformation of pile body in the course of loading, the formulas for calculating the compressibility coefficient of pile body and the compression quantity of pile body of different types of piles are given. The interaction between pile group and soil under pile cap is analyzed. The load transfer relationship between pile and soil under square cap and round cap is studied respectively. The formula for calculating the deformation of pile and surrounding soil and the formula for calculating the influence radius of pile are established. The bearing capacity of concrete filled steel tube (CFST) under tension and compression is calculated and analyzed with practical examples. The influence radius of pile, the settlement of pile group and soil are obtained, and the impact shear of pile cap is checked and calculated. Anti-capsizing and anti-skid safety. The stress, deformation and stress distribution of CFST pile foundation are analyzed by ABAQUS finite element software. The stress variation along the path of the two piles with the greatest force is analyzed, and the tension and compression state of the maximum deformation of the pile and the soil is also analyzed.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU476;TM614

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