【摘要】：隨著交通基礎(chǔ)設(shè)施建設(shè)的迅速發(fā)展,道路交通荷載引起的環(huán)境振動(dòng)問(wèn)題受到的關(guān)注程度越來(lái)越高。道路車(chē)輛引起的振動(dòng),以振動(dòng)波的形式向路基和地基中傳播,引起路基土體及地基土體的振動(dòng),同時(shí)通過(guò)地基土體向周?chē)鷤鞑?導(dǎo)致周?chē)Y(jié)構(gòu)物產(chǎn)生振動(dòng)。長(zhǎng)期振動(dòng)導(dǎo)致土體動(dòng)穩(wěn)定性降低,道路變形沉降,增大了周?chē)ㄖY(jié)構(gòu)的安全隱患。在分析XPS板隔振機(jī)理及隔振可行性的基礎(chǔ)上,并基于課題組對(duì)新型冷阻層(XPS板+橡膠顆粒改良粉煤灰土組合結(jié)構(gòu))的研究基礎(chǔ),本文對(duì)新型冷阻層作為路基填料的隔振效果進(jìn)行研究。旨在通過(guò)設(shè)置新型冷阻層,利用XPS板良好的隔振效果,減小道路交通荷載引起的振動(dòng)對(duì)路基、地基及周?chē)h(huán)境的影響。本文通過(guò)室內(nèi)沖擊荷載試驗(yàn)對(duì)新型冷阻層的隔振效果進(jìn)行了探究,重點(diǎn)分析了XPS板厚度、振動(dòng)強(qiáng)度、凍融循環(huán)次數(shù)對(duì)土體結(jié)構(gòu)振動(dòng)及新型冷阻層隔振效果的影響,并采用ABAQUS有限元軟件對(duì)室內(nèi)試驗(yàn)及實(shí)際道路進(jìn)行了數(shù)值模擬分析,具體內(nèi)容如下:(1)為了評(píng)價(jià)新型冷阻層及XPS板的隔振效果,本文設(shè)置了三組對(duì)比試驗(yàn),就粉質(zhì)黏土、改良土、新型冷阻層三種路基填料的隔振效果進(jìn)行了對(duì)比。(2)為了確定XPS板的最佳厚度,文中對(duì)比了不同厚度的XPS板所構(gòu)成的新型冷阻層的隔振效果,綜合考慮經(jīng)濟(jì)指標(biāo)、保溫效果以及力學(xué)特性三項(xiàng)控制因素,選定了XPS板厚度的最佳值。(3)利用最佳厚度的XPS板所構(gòu)成的新型冷阻層,探究了振動(dòng)強(qiáng)度對(duì)土體結(jié)構(gòu)振動(dòng)及新型冷阻層隔振效果的影響。本文所設(shè)置的新型冷阻層主要應(yīng)用于季凍區(qū)道路,為了模擬季凍區(qū)真實(shí)道路環(huán)境,對(duì)三種土體模型結(jié)構(gòu)分別進(jìn)行了五次凍融循環(huán)試驗(yàn),對(duì)其振動(dòng)情況進(jìn)行了對(duì)比,分析了凍融循環(huán)次數(shù)對(duì)新型冷阻層隔振效果的影響。(4)利用ABAQUS有限元軟件對(duì)室內(nèi)試驗(yàn)進(jìn)行了模擬,并將模擬結(jié)果與實(shí)際室內(nèi)試驗(yàn)結(jié)果進(jìn)行了比較。在驗(yàn)證有限元模擬的準(zhǔn)確性及可行性的基礎(chǔ)上,模擬了新型冷阻層在實(shí)際道路中的應(yīng)用,并就結(jié)果中的隔振效果進(jìn)行了評(píng)價(jià)。研究表明,在沖擊荷載作用下,新型冷阻層及XPS板均具有一定的隔振效果,且豎向隔振效果明顯。綜合各種控制因素,確定了5cm為構(gòu)成新型冷阻層的最佳XPS板厚度。土體結(jié)構(gòu)振動(dòng)隨沖擊荷載的增大而增大,新型冷阻層及XPS板的隔振效果隨沖擊荷載的增大先增大后逐漸趨于平穩(wěn)。在凍融循環(huán)次數(shù)少的情況下,橡膠顆粒改良粉煤灰土及新型冷阻層的動(dòng)穩(wěn)定性均要優(yōu)于粉質(zhì)黏土,新型冷阻層在凍融循環(huán)過(guò)程中能保持一定的隔振效果,且豎向隔振效果明顯。ABAQUS有限元軟件的模擬分析表明,新型冷阻層路基減小了道路車(chē)輛荷載振動(dòng)引起的路基土體及地基土體的振動(dòng)變形以及對(duì)周?chē)h(huán)境的影響。
[Abstract]:With the rapid development of traffic infrastructure, more and more attention has been paid to environmental vibration caused by road traffic load. The vibration caused by road vehicles propagates to the roadbed and foundation in the form of vibration wave, which causes the vibration of subgrade soil and foundation soil. At the same time, the vibration of surrounding structure is caused by the propagation of ground soil mass to the surrounding. The long-term vibration results in the decrease of dynamic stability of soil and the settlement of road deformation, which increases the hidden danger of the surrounding building structure. On the basis of analyzing the vibration isolation mechanism of XPS plate and the feasibility of vibration isolation, and based on the research foundation of the new type of cold resistance layer (XPS rubber particle modified fly ash-soil composite structure) by our team, this paper analyzes the mechanism of vibration isolation and the feasibility of vibration isolation. In this paper, the vibration isolation effect of a new type of cold resistance layer as subgrade filler is studied. The aim of this paper is to reduce the influence of vibration caused by road traffic load on subgrade, foundation and surrounding environment by setting a new type of cold resistance layer and making use of the good vibration isolation effect of XPS plate. In this paper, the vibration isolation effect of the new type of cold resistance layer is investigated through the indoor impact load test, and the effects of the thickness of the XPS plate, the vibration intensity and the number of freeze-thaw cycles on the vibration of the soil structure and the vibration isolation effect of the new type of cold resistance layer are analyzed emphatically. In order to evaluate the vibration isolation effect of new cold resistance layer and XPS board, three sets of contrast tests were set up in this paper, which are silty clay, and the results are as follows: (1) in order to evaluate the vibration isolation effect of new cold resistance layer and XPS board, the numerical simulation analysis of indoor test and practical road is carried out by using ABAQUS finite element software. (2) in order to determine the optimum thickness of the XPS plate, the vibration isolation effect of the new type of cold resistance layer composed of the different thickness of the XPS plate is compared in this paper, and the economic index is considered comprehensively, and the vibration isolation effect of the new type of subgrade filler is compared between the modified soil and the new type of cold resistance layer. The optimum thickness of the XPS plate is selected by three controlling factors: thermal insulation effect and mechanical properties. (3) A new type of cold resistance layer composed of the optimal thickness of the XPS plate is selected. The influence of vibration intensity on the vibration of soil structure and the vibration isolation effect of a new type of cold resistance layer is studied. In order to simulate the real road environment of the freezing zone, five freeze-thaw cycles of three soil model structures were carried out, and their vibration was compared. The influence of freezing and thawing cycles on the vibration isolation effect of the new type of cold resistance layer is analyzed. (4) the indoor test is simulated by using ABAQUS finite element software, and the simulation results are compared with the actual indoor test results. On the basis of verifying the accuracy and feasibility of the finite element simulation, the application of the new type of cold resistance layer in the actual road is simulated, and the vibration isolation effect of the results is evaluated. The results show that under the impact load, both the new cold resistance layer and the XPS plate have a certain vibration isolation effect, and the vertical vibration isolation effect is obvious. According to all kinds of control factors, the optimum thickness of 5cm is determined to form a new type of cold resistance layer. The vibration of soil structure increases with the increase of impact load, and the vibration isolation effect of new cold resistance layer and XPS plate increases at first and then tends to steady gradually with the increase of impact load. Under the condition of less cycles of freezing and thawing, the dynamic stability of rubber particle modified pulverized coal ash soil and new type of cold resistance layer are better than those of silty clay, and the new type of cold resistance layer can keep certain vibration isolation effect in the process of freezing and thawing, and the dynamic stability of the new type cold resistance layer is better than that of silty clay. The simulation analysis of Abaqus finite element software shows that the vibration deformation of subgrade soil and foundation soil caused by road vehicle load vibration is reduced and the influence on surrounding environment is reduced by using Abaqus finite element software.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U416.1

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