【摘要】：隨著世界范圍內(nèi)環(huán)境污染的不斷加劇和不可再生能源的日益枯竭,風(fēng)力發(fā)電作為一種綠色能源已受到廣泛關(guān)注。我國(guó)陜西北部定邊地區(qū)風(fēng)能資源豐富,風(fēng)電場(chǎng)建設(shè)工程日益增多。風(fēng)電基礎(chǔ)的建設(shè)是風(fēng)電場(chǎng)建設(shè)的最關(guān)鍵環(huán)節(jié)之一,陜北地區(qū)黃土分布范圍廣、厚度大、濕陷等級(jí)高,給風(fēng)電基礎(chǔ)工程的建設(shè)帶來(lái)一定的困難。因此,對(duì)該地區(qū)風(fēng)電機(jī)組地基處理技術(shù)開(kāi)展研究,具有重要的意義和指導(dǎo)價(jià)值。本文以陜北沈口子風(fēng)電場(chǎng)100MW工程為背景,通過(guò)理論分析、數(shù)值模擬和現(xiàn)場(chǎng)檢測(cè)等方法,對(duì)陜北濕陷性黃土大型風(fēng)電機(jī)組地基處理技術(shù)進(jìn)行研究,主要工作和結(jié)論如下:首先,對(duì)風(fēng)電機(jī)組基礎(chǔ)的受力特性及關(guān)鍵技術(shù)進(jìn)行了系統(tǒng)分析。風(fēng)電機(jī)組在運(yùn)行過(guò)程中,基礎(chǔ)的受力特性與一般基礎(chǔ)有很大不同,將承受豎向荷載、傾覆彎矩、水平荷載和扭矩的共同作用。在復(fù)雜荷載作用下,如何滿(mǎn)足基礎(chǔ)穩(wěn)定性要求是地基處理的關(guān)鍵技術(shù)。其次,對(duì)陜北濕陷性黃土特性開(kāi)展試驗(yàn)研究,得到了場(chǎng)地地基土的物理力學(xué)參數(shù),并對(duì)濕陷性地質(zhì)條件進(jìn)行了評(píng)價(jià)分析,在此基礎(chǔ)上提出采用擴(kuò)底混凝土灌注樁為主要結(jié)構(gòu)形式的地基處理方案并進(jìn)行理論驗(yàn)算。同時(shí),利用ABAQUS有限元模擬軟件,分析了不同荷載、不同樁長(zhǎng)、不同樁徑、摩擦系數(shù)變化對(duì)樁沉降量的影響,得出樁身軸力、應(yīng)力應(yīng)變隨荷載的分布特性,結(jié)果表明:施工采用的擴(kuò)底混凝土灌注樁的各項(xiàng)參數(shù)均滿(mǎn)足基礎(chǔ)承載要求。最后,通過(guò)對(duì)地基處理方案中的相同樁徑,不同樁長(zhǎng)的三種類(lèi)型的單樁靜載、低應(yīng)變現(xiàn)場(chǎng)試驗(yàn)檢測(cè),分析了不同荷載對(duì)樁頂沉降量的影響,得出樁的豎向極限承載力標(biāo)準(zhǔn)值,其檢測(cè)和計(jì)算結(jié)果均小于控制指標(biāo),進(jìn)一步驗(yàn)證了擴(kuò)底混凝土灌注樁參數(shù)選取是科學(xué)合理的,也為今后本地區(qū)類(lèi)似風(fēng)電機(jī)組的基礎(chǔ)工程建設(shè)提供科學(xué)依據(jù)。
[Abstract]:With the worsening of environmental pollution and the depletion of non-renewable energy in the world, wind power generation as a green energy has been widely concerned. Dingbian area in northern Shaanxi Province is rich in wind energy resources and wind farm construction projects are increasing day by day. The construction of wind power foundation is one of the most important links in wind farm construction. The loess in northern Shaanxi has a wide distribution range, a large thickness and a high grade of collapsibility, which brings some difficulties to the construction of wind power foundation engineering. Therefore, it is of great significance and guiding value to study the foundation treatment technology of wind turbine units in this area. In this paper, based on the 100MW project of Shenkouzi wind farm in northern Shaanxi, the foundation treatment technology of collapsible loess large scale wind turbine in northern Shaanxi is studied by theoretical analysis, numerical simulation and field detection. The main work and conclusions are as follows: first, The mechanical characteristics and key technologies of wind turbine foundation are systematically analyzed. During the operation of wind turbine, the bearing characteristics of the foundation are very different from those of the general foundation, which will bear the joint action of vertical load, overturning moment, horizontal load and torque. How to meet the requirements of foundation stability under complex loads is the key technology of foundation treatment. Secondly, the properties of collapsible loess in northern Shaanxi are studied, and the physical and mechanical parameters of ground soil are obtained, and the geological conditions of collapsibility are evaluated and analyzed. On the basis of this, a foundation treatment scheme is put forward in which the reinforced concrete cast-in-place pile is used as the main structural form and the theoretical checking calculation is carried out. At the same time, the influence of different load, pile length, pile diameter and friction coefficient on pile settlement is analyzed by using ABAQUS finite element simulation software, and the distribution characteristics of axial force, stress and strain of pile body with load are obtained. The results show that the parameters of the reinforced concrete cast-in-place pile meet the requirements of foundation bearing. Finally, by testing three types of single pile with the same diameter and different pile lengths in the foundation treatment scheme, the influence of different loads on the settlement of the pile top is analyzed, and the standard value of the vertical ultimate bearing capacity of the pile is obtained. The test and calculation results are less than the control index, which further verifies that the selection of the parameters of the reamed concrete cast-in-place pile is scientific and reasonable, and also provides a scientific basis for the future construction of similar wind turbine units in this area.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM614

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