【摘要】：我國(guó)經(jīng)濟(jì)在飛速發(fā)展,化石能源不斷消耗,環(huán)境污染日益嚴(yán)重,迫切需要大力發(fā)展清潔能源。而在我國(guó)的西北地區(qū)有著豐富的風(fēng)力資源,同時(shí),“十二五”規(guī)劃的完成,使得我國(guó)在風(fēng)力資源的利用上有了諸多成就。由于我國(guó)地域遼闊,不同區(qū)域的地質(zhì)條件差異較大,西北地區(qū)分布著大量的鹽漬土,該地區(qū)氣候惡劣,低溫雨雪天氣頻發(fā)。嚴(yán)峻的氣候條件及特殊的風(fēng)機(jī)地基土,對(duì)風(fēng)機(jī)機(jī)組在建設(shè)期及運(yùn)營(yíng)中提出了巨大的挑戰(zhàn)。本文以內(nèi)蒙古中西部某鹽漬土地基上風(fēng)電場(chǎng)建設(shè)為例,研究鹽漬土地基在風(fēng)致疲勞荷載、凍融作用及鹽分的影響下其動(dòng)靜強(qiáng)度的變化規(guī)律。首先,分析凍融次數(shù)及含鹽量對(duì)鹽漬土靜強(qiáng)度的影響;進(jìn)而,對(duì)建設(shè)場(chǎng)地自然風(fēng)進(jìn)行模擬與等效,確定作用于地基土的風(fēng)致疲勞荷載形式并進(jìn)行試驗(yàn),分析風(fēng)致疲勞荷載作用時(shí),土體動(dòng)力特性與凍融循環(huán)次數(shù)、地基土含鹽量間的關(guān)系,總結(jié)當(dāng)含鹽量一定時(shí)地基土經(jīng)受相同的凍融循環(huán)作用后,其動(dòng)應(yīng)力與靜應(yīng)力之間的關(guān)系;最后,通過(guò)土體結(jié)構(gòu)損傷理論分析風(fēng)致疲勞荷載、凍融循環(huán)及鹽分作用下鹽漬土的強(qiáng)度損傷機(jī)理,并確定各因素影響的顯著性水平。研究發(fā)現(xiàn):(1)凍融循環(huán)作用下,鹽漬土的粘聚力及內(nèi)摩擦角隨凍融次數(shù)逐漸降低,當(dāng)凍融次數(shù)超過(guò)5次后,其減小速率會(huì)出現(xiàn)減緩的趨勢(shì)。(2)當(dāng)含鹽量從0%變化到6%時(shí),鹽漬土的粘聚力及內(nèi)摩擦角會(huì)呈現(xiàn)先減小后增大的趨勢(shì),變化速率與凍融次數(shù)有關(guān)。(3)試驗(yàn)條件相同時(shí),風(fēng)致疲勞荷載作用下,土體的極限動(dòng)應(yīng)力較靜應(yīng)力會(huì)有不同程度的減小;凍融作用下,土體的極限動(dòng)應(yīng)力會(huì)隨著凍融次數(shù)的增加呈降低趨勢(shì)。(4)風(fēng)致疲勞荷載、含鹽量及凍融循環(huán)均會(huì)使鹽漬土產(chǎn)生損傷,含鹽量及凍融循環(huán)對(duì)土體強(qiáng)度損傷的影響顯著。
[Abstract]:With the rapid development of economy, fossil energy consumption and environmental pollution, it is urgent to develop clean energy. In the northwest of China, there are abundant wind resources. At the same time, with the completion of the 12th Five-Year Plan, China has made a lot of achievements in the utilization of wind resources. Because of the vast territory and the great difference of geological conditions in different regions, there is a large amount of saline soil distributed in Northwest China, which has a bad climate and frequent low temperature rain and snow weather. The severe climatic conditions and special foundation soil of the fan have brought great challenges to the fan unit during the construction period and operation. Taking the wind farm construction on a salinized soil foundation in the central and western part of Inner Mongolia as an example, this paper studies the dynamic and dynamic strength of the saline soil foundation under the influence of wind-induced fatigue load, freezing and thawing and salt content. Firstly, the influence of freeze-thaw times and salt content on the static strength of saline soil is analyzed. Then, the natural wind of the construction site is simulated and equivalent, the wind-induced fatigue load forms acting on the foundation soil are determined and tested, and the dynamic characteristics of soil and the number of freeze-thaw cycles are analyzed when the wind-induced fatigue load is acted on. The relationship between dynamic stress and static stress of foundation soil under the same freeze-thaw cycle is summarized. Finally, the mechanism of strength damage of saline soil under the action of wind induced fatigue load, freeze-thaw cycle and salt is analyzed by the theory of soil structure damage, and the significance of each factor is determined. The results are as follows: (1) under the action of freeze-thaw cycle, the cohesion and internal friction angle of saline soil gradually decrease with the number of freeze-thaw times, when the freeze-thaw times exceed 5 times, (2) when the salt content changes from 0% to 6%, the cohesive force and internal friction angle of saline soil will decrease first and then increase. The rate of change is related to the number of freeze-thaw. (3) when the test conditions are the same, the ultimate dynamic stress of soil will decrease in varying degrees compared with the static stress under the action of wind-induced fatigue load; Under the action of freeze-thaw, the ultimate dynamic stress of soil will decrease with the increase of freeze-thaw times. (4) Wind-induced fatigue load, salt content and freeze-thaw cycle will cause damage to saline soil. The effect of salt content and freeze-thaw cycle on soil strength damage is significant.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM614

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