本文選題：第二階段沖斷 + 兩尺度模型��； 參考：《長(zhǎng)安大學(xué)》2015年博士論文

【摘要】：沖斷是指由兩個(gè)間距很小(小于0.6m)的橫向裂縫與短的縱向裂縫和路面邊緣(或縱向接縫)所圍成的區(qū)域。沖斷是CRCP的主要病害形式,在沖斷形成初期,路面狀況良好,對(duì)行車(chē)舒適性及安全性影響不大。但在外界環(huán)境及車(chē)輛荷載的反復(fù)作用下,沖斷區(qū)域開(kāi)始出現(xiàn)后續(xù)開(kāi)裂及剝落,嚴(yán)重影響行車(chē)舒適性及安全性,需對(duì)路面進(jìn)行修復(fù)�；诖�,本文提出以縱向裂縫的形成時(shí)刻為界將沖斷的發(fā)展過(guò)程分成兩個(gè)階段,第一階段是縱向裂縫的形成階段,第二階段是由橫向裂縫、縱向裂縫和路面邊緣(或縱向接縫)形成區(qū)域的退化。盡管?chē)?guó)內(nèi)外對(duì)于CRCP沖斷病害已經(jīng)進(jìn)行了大量的研究,并取得了豐碩的成果,但多從宏觀尺度對(duì)CRCP第一階段沖斷展開(kāi)研究,在基于兩尺度模型的第二階段沖斷區(qū)域退化和維修標(biāo)準(zhǔn)方面缺乏研究。CRCP是高等級(jí)路面的重要形式之一,為了適應(yīng)我國(guó)高等級(jí)公路發(fā)展的需要,對(duì)CRCP的第二階段沖斷展開(kāi)研究具有十分重要的工程意義。本文基于數(shù)值模擬試驗(yàn)和室內(nèi)試驗(yàn)研究,從宏觀、細(xì)觀兩尺度出發(fā)對(duì)第二階段沖斷區(qū)域退化和維修標(biāo)準(zhǔn)進(jìn)行研究。主要研究?jī)?nèi)容如下:首先,考慮沖斷區(qū)域路面的振動(dòng),建立沖斷區(qū)域車(chē)輛振動(dòng)模型,進(jìn)行沖斷區(qū)域人-車(chē)-路耦合振動(dòng)分析,獲得沖擊荷載和乘客的加速度時(shí)程曲線,并進(jìn)行參數(shù)敏感性分析。沖擊荷載將用于沖斷區(qū)域后續(xù)開(kāi)裂和裂縫處混凝土剝落機(jī)理研究,乘客加速度將用于第二階段沖斷區(qū)域維修標(biāo)準(zhǔn)的研究。其次,考慮水泥混凝土在細(xì)觀尺度上是由集料、膠凝材料及其界面組成,利用離散元軟件從細(xì)觀尺度上進(jìn)行水泥混凝土抗壓強(qiáng)度、彎拉強(qiáng)度和抗剪強(qiáng)度數(shù)值模擬試驗(yàn),對(duì)混凝土強(qiáng)度形成及破壞機(jī)理進(jìn)行研究,得到混凝土的抗壓強(qiáng)度、彈性模量、彎拉強(qiáng)度和抗剪強(qiáng)度;考慮沖斷區(qū)域特點(diǎn),結(jié)合所得彈性模量,建立CRCP有限元宏觀模型,對(duì)車(chē)輛荷載、溫度梯度和濕度梯度作用下的沖斷區(qū)域進(jìn)行宏觀受力分析;結(jié)合混凝土細(xì)觀研究所得彎拉強(qiáng)度,對(duì)沖斷區(qū)域后續(xù)開(kāi)裂進(jìn)行研究,并分析混凝土細(xì)觀組成參數(shù)和宏觀影響因素對(duì)沖斷區(qū)域的后續(xù)開(kāi)裂的影響。再次,在混凝土剝落形成原因分析的基礎(chǔ)上,將剝落分為剪切剝落和分層剝落,并建立分層剝落數(shù)學(xué)模型;考慮沖斷區(qū)域特點(diǎn),利用有限元軟件建立CRCP宏觀力學(xué)分析模型,對(duì)車(chē)輛荷載、溫度梯度和濕度梯度作用下的沖斷區(qū)域裂縫處的剪應(yīng)力和分層處的彎拉應(yīng)力進(jìn)行分析;結(jié)合混凝土細(xì)觀模擬試驗(yàn)所得抗剪強(qiáng)度和彎拉強(qiáng)度,對(duì)沖斷區(qū)域混凝土的剝落進(jìn)行研究,并分析混凝土細(xì)觀組成參數(shù)和宏觀影響因素對(duì)沖斷區(qū)域混凝土剝落的影響。然后,考慮沖斷區(qū)域邊緣裂縫對(duì)混凝土性能的影響,基于加速加載試驗(yàn)、干濕循環(huán)試驗(yàn)和凍融循環(huán)試驗(yàn),對(duì)沖斷區(qū)域混凝土的退化進(jìn)行試驗(yàn)研究;在沖斷區(qū)域后續(xù)開(kāi)裂和剝落兩尺度研究及混凝土退化試驗(yàn)研究的基礎(chǔ)上,結(jié)合混凝土彎拉強(qiáng)度、抗剪強(qiáng)度分析及水泥混凝土細(xì)觀模型試驗(yàn),對(duì)第二階段沖斷區(qū)域退化機(jī)理進(jìn)行研究,給出第二階段沖斷區(qū)域退化預(yù)估方法。最后,提出沖斷區(qū)域臺(tái)階高度的概念,考慮車(chē)輛通過(guò)單個(gè)沖斷區(qū)域引起的振動(dòng)屬于瞬態(tài)振動(dòng),參考最大瞬態(tài)振動(dòng)值(MTVV)的概念,以MTVV作為行車(chē)舒適性評(píng)價(jià)指標(biāo),通過(guò)對(duì)瞬態(tài)振動(dòng)行車(chē)舒適性評(píng)價(jià)標(biāo)準(zhǔn)的研究,結(jié)合行車(chē)舒適性影響因素分析,給出沖斷區(qū)域維修標(biāo)準(zhǔn)的確定方法和步驟。同時(shí),基于沖斷區(qū)域退化機(jī)理的研究成果,在室內(nèi)試驗(yàn)研究的基礎(chǔ)上對(duì)第二階段沖斷區(qū)域退化延緩措施進(jìn)行研究。
[Abstract]:Flushing refers to the area enclosed by two small (less than 0.6m) transverse cracks and short longitudinal cracks and road edges (or longitudinal joints). The thrust is the main form of CRCP disease. In the early stages of the formation, the road condition is good, and it has little effect on the comfort and safety of the vehicle, but the external environment and the repeated action of the vehicle load On the other hand, the following cracking and exfoliation began to occur in the thrust area, which seriously affected the comfort and safety of driving, and the road was repaired. Based on this, the development process of the longitudinal fracture was divided into two stages, the first stage was the formation stage of the longitudinal crack and the second stage was the transverse and longitudinal fissure. Fracture and pavement edge (or longitudinal joint) degenerate. Although a lot of research has been carried out on CRCP breakage at home and abroad, and great achievements have been made, the first stage of CRCP flushing from the macro scale is studied, and the lack of research on the degradation and maintenance standards of the two scale model based on the second stage of the scour zone and the maintenance standards. .CRCP is one of the important forms of the high grade road. In order to meet the needs of the development of the high grade highway in China, it is of great significance to study the second stage thrust of the CRCP. Based on the numerical simulation test and the laboratory test, the degradation and maintenance standard of the second stages of the thrust zone are made from the macroscopic and the fine two feet degree. The main research contents are as follows: first, the vibration of the pavement in the thrust area is considered, the vehicle vibration model of the thrust zone is established, the coupling vibration analysis of the man car road in the thrust zone is analyzed, the impact load and the passenger acceleration time history curve are obtained, and the parameter sensitivity analysis is carried out. The impact load will be used for the subsequent cracking of the thrust zone and the subsequent cracking of the thrust zone. Research on the mechanism of concrete exfoliation at cracks, passenger acceleration will be used in the study of the second stage maintenance standard. Secondly, the cement concrete is composed of aggregate, cementitious material and its interface on the meso scale, and the compressive strength, flexural strength and shear strength of the concrete are carried out from the meso scale using the discrete element software. The compressive strength, modulus of elasticity, flexural strength and shear strength of concrete are obtained by numerical simulation test. Considering the characteristics of the thrust area and the elastic modulus of the concrete, the CRCP finite element macro model is established, and the thrust area under the action of vehicle load, temperature gradient and humidity gradient is carried out. Macro stress analysis, combined with the tensile strength of the concrete meso study, to study the subsequent cracking of the broken area, and analyze the influence of the concrete meso component parameters and macro influence factors on the subsequent cracking of the broken zone. Thirdly, on the basis of the analysis of the reasons for the formation of concrete, the peeling is divided into shear peeling and stratified stripping. At the same time, a mathematical model of stratified stripping is set up. Considering the characteristics of the punching and breaking area, the CRCP macro mechanical analysis model is established by using the finite element software. The shear stress and the bending stress at the fracture zone at the breaking zone under the action of the vehicle load, the temperature gradient and the humidity gradient are analyzed, and the shear strength is obtained by the concrete meso simulation test. And the flexural strength, the exfoliation of the concrete in the hedge area is studied, and the influence of the concrete meso component parameters and macro factors on the concrete exfoliation in the broken zone is analyzed. Then, the effect of the edge cracks on the concrete performance is considered. Based on the accelerated loading test, the dry and wet cycle test and the freeze-thaw cycle test, the hedging break are taken. The degradation of regional concrete is studied. On the basis of two scale research and concrete degradation test of subsequent cracking and peeling in the thrust area, combined with concrete flexural strength, shear strength analysis and cement concrete meso model test, the degradation mechanism of the second stage of punching zone is studied, and the second stage punching zone is given. In the end, the concept of step height is put forward. Considering the vibration of a vehicle passing through a single thrust area, the vibration belongs to the transient vibration, and the concept of the maximum transient vibration value (MTVV) is used as the evaluation index of the driving comfort, and the comfort evaluation standard of the transient vibration driving is studied, and the comfort of the vehicle is combined with the comfort of the driving. In the analysis of the factors of sexual influence, the methods and steps for determining the maintenance standards of the punching zone are given. At the same time, based on the research results of the degradation mechanism of the thrust zone, the second stage degradation delay measures are studied on the basis of the laboratory test.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U418.6

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