本文關(guān)鍵詞：重載汽車行駛下班吉—貝洛科路面穩(wěn)定性研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 車輛軸載 柔性路面結(jié)構(gòu) 等量軸載換算 等效單軸荷載

【摘要】：在撒哈拉沙漠以南的非洲地區(qū)特別是在中非共和國地區(qū)(CAR),道路的使用狀況和使用壽命主要與以下兩個(gè)因素密切相關(guān):經(jīng)濟(jì)和交通。經(jīng)濟(jì)因素是指是道路建設(shè)在地區(qū)經(jīng)濟(jì)不發(fā)達(dá)的背景之下,并且缺乏維修養(yǎng)護(hù)措施。而交通因素是指設(shè)計(jì)的載重限制不被遵守,車輛總是超載,結(jié)果導(dǎo)致路面上的車輛軸重大于路面設(shè)計(jì)的最大軸載。這些問題不但使路面受到環(huán)境影響破壞的效果更加嚴(yán)重;而且還使路面過早的出現(xiàn)了疲勞開裂現(xiàn)象。因此,在此背景之下本文重點(diǎn)研究了在重載車輛荷載作用下柔性路面結(jié)構(gòu)的穩(wěn)定性問題。對(duì)于路面在重型車輛荷載作用下的穩(wěn)定性研究,本文選擇瀝青路面應(yīng)力計(jì)算軟件(BISAR)來進(jìn)行分析,為了更好的確定軸載水平與路面性能之間的關(guān)系,對(duì)路面進(jìn)行均勻布載,通過BISAR 3.0軟件計(jì)算承受均布荷載作用下柔性路面的應(yīng)力、應(yīng)變和位移,以此衡量路面功能上和結(jié)構(gòu)上的性能的損失(包括功能上的和結(jié)構(gòu)上的),并且評(píng)價(jià)材料和輪胎的壓力對(duì)路面性能的影響。對(duì)此,首先進(jìn)行氣候變化和交通荷載的分析,氣候變化分析包括降雨和溫度變化的分析,交通荷載分析包括輪胎接觸壓力、車輪荷載、移動(dòng)荷載、重復(fù)荷載和軸載組合,研究它們?cè)诓煌沫h(huán)境下,軸載與路面性能之間的關(guān)系。其次,進(jìn)行柔性路面結(jié)構(gòu)分析,包括環(huán)境和荷載對(duì)路面穩(wěn)定性的影響,以此評(píng)估材料和輪胎壓力對(duì)路面性能的影響。此外,本文主要在中非共和國(CAR)五個(gè)不同的氣候區(qū)下進(jìn)行了柔性路面結(jié)構(gòu)力學(xué)響應(yīng)和使用性能的研究。在研究中得知柔性路面的使用性能和軸重之間的關(guān)系由路面所處的氣候條件所決定,對(duì)于柔性路面結(jié)構(gòu)設(shè)計(jì),要充分考慮到當(dāng)?shù)氐牟牧虾褪┕ぜ夹g(shù)。此外,文中應(yīng)用廣義四次冪定律來進(jìn)行等量軸載換算(LEF)。軸載計(jì)算中涉及各種軸重組合,計(jì)算時(shí)采用標(biāo)準(zhǔn)的80k N單軸荷載(18000磅)和標(biāo)準(zhǔn)的151.2k N雙軸荷載(34000磅)進(jìn)行柔性路面結(jié)構(gòu)設(shè)計(jì)。而且,通過對(duì)交通荷載的統(tǒng)計(jì)分析,文中對(duì)標(biāo)準(zhǔn)軸載進(jìn)行了等量換算。最后,本文對(duì)中非地區(qū)的建筑材料和施工技術(shù)進(jìn)行了深刻研究,同時(shí)開展了路面使用環(huán)境和交通荷載的綜合分析,以便在此基礎(chǔ)上建立一個(gè)適用于不同氣候條件的柔性路面性能和材料評(píng)定標(biāo)準(zhǔn)。針對(duì)垂向荷載對(duì)柔性路面的影響進(jìn)行分析,得出垂向應(yīng)力和應(yīng)變對(duì)于垂向荷載非常敏感。在較厚的表面層里,垂向荷載增加24%會(huì)導(dǎo)致垂向應(yīng)力和垂向應(yīng)變分別增長(zhǎng)6%和14%。而輪胎壓力增長(zhǎng)13%導(dǎo)致垂向應(yīng)力和垂向應(yīng)變分別增長(zhǎng)7%和10%。這個(gè)現(xiàn)象與輪胎和路面的接觸面積有關(guān),且清楚地表明輪胎壓力對(duì)垂向應(yīng)力、應(yīng)變有質(zhì)的影響。120k N-1000k Pa交通荷載相比于80k N-700k Pa交通荷載的最高應(yīng)力應(yīng)變值(圖4-1)和最低疲勞荷載周期都被顯示出來。對(duì)于四種不同的交通荷載和相似的材料常數(shù),相應(yīng)的破壞時(shí)的疲勞荷載循環(huán)次數(shù)和模量比都被估計(jì)出來。交通荷載量最大時(shí),即120k N-1000k Pa,疲勞荷載循環(huán)次數(shù)最小。相對(duì)于其他交通荷載,這種荷載會(huì)導(dǎo)致更多破壞。模量比為10時(shí),80k N-700k Pa的交通荷載的疲勞壽命為5x106次,而1200k N-1000k Pa交通荷載的疲勞壽命只有0.2x106次。疲勞壽命減少了87%,這清楚地反映了交通荷載提高的潛在傷害基于BISAR 3.0柔性路面結(jié)構(gòu)的模擬,發(fā)現(xiàn)路面破壞經(jīng)常發(fā)生在汽車輪胎作用的區(qū)域。這些破壞是由于正常荷載或者超負(fù)荷荷載引起的過大的垂向應(yīng)力導(dǎo)致的。然而,我們注意到,即使沒有交通荷載的影響,路面結(jié)構(gòu)也會(huì)由于諸如降雨、顯著的溫度變化和地下水位的抬升等環(huán)境因素而降級(jí)。
[Abstract]:In sub Saharan Africa especially in the Central African Republic area (CAR), and the service life of road usage are closely related to the following two factors: economy and transportation. The economic factor is refers to the road construction in the area with undeveloped economy background, and the lack of maintenance measures and traffic. Factor refers to the load limit design are not compliance, vehicles are always overloaded, resulting in the maximum axle load of vehicle axle load is larger than that on the road pavement design. These problems not only make the road under the influence of environment damage effect is more serious; but also make the pavement appeared early fatigue cracking phenomenon. Therefore, under this background this paper focuses on the research of the problem of stability of flexible pavement under vehicle load. The effect of heavy load for stability of pavement under heavy load vehicle, the asphalt road surface The force calculation software (BISAR) to analyze, in order to better define the relationship between the level of axle load and pavement performance, uniform load on the pavement, through the BISAR 3 software to calculate the stress of flexible pavement under uniform load, strain and displacement, in order to measure the performance of pavement function and structure of the loss (including the function and structure of the impact and evaluation of materials), and tire pressure on pavement performance. In this regard, the first analysis of climate change and the traffic load and climate change analysis of rainfall and temperature change, the traffic load analysis including tire contact pressure, wheel load, moving load and repeated load and the axle combination, and studies them in a different environment, the relationship between axle load and pavement performance. Secondly, analysis of flexible pavement structure, including the influence of environment and load on the stability of this. Impact assessment materials and tire pressure on pavement performance. In addition, this paper mainly in the Central African Republic (CAR) five different climatic zones were studied and the performance of the structural mechanics response of flexible pavement. In the study that the relationship between flexible pavement performance and the weight of the pavement by climatic conditions the decision for the flexible pavement structure design, should give full consideration to the local materials and construction techniques. In addition, for equivalent axle load conversion using the generalized four power law (LEF). This paper relates to various combinations of axle load axle load calculation, calculation using the standard 80K N single axle load (18000 pounds) and the standard 151.2k N biaxial load (34000 pounds) of flexible pavement design. Moreover, based on the statistical analysis of the traffic load, the standard axle load of equivalent conversion. Finally, the non area of building materials and Application Technology of deep research, at the same time to carry out a comprehensive analysis of pavement environment and traffic load, so as to build a suitable for different climatic conditions of the flexible pavement performance and material standards. According to the vertical load effect on flexible pavement is analyzed, the vertical stress and strain for vertical the load is very sensitive. In the surface layer of thick, vertical load increasing the contact area of 24% will cause the vertical stress and vertical strain increased 6% and 14%. increased 13% tire pressure leads to the vertical stress and vertical strain increased 7% and 10%. and the phenomenon of tire and road surface, and clear that the tire pressure on the vertical stress and strain with the highest quality.120k N-1000k Pa 80K N-700k Pa compared to the traffic load of traffic load stress and strain (Figure 4-1) and the minimum fatigue load cycle are shown Four. For different traffic loads and similar material constants, the corresponding failure of fatigue load cycles and modulus ratio are estimated. The maximum traffic load, namely 120K N-1000k Pa, the number of loading cycles. The minimum fatigue compared to other traffic load, the load will cause more damage than for the modulus. 10, the fatigue life of the traffic load for the Pa 80K N-700k 5x106 1200k N-1000k Pa, and the fatigue life of traffic load only 0.2x106 times. The fatigue life was reduced by 87%, which clearly reflects the potential damage to improve traffic load simulation of 3 flexible pavement structure based on BISAR, found that pavement damage often occurs in the automobile tire area. These failure is due to the normal load or overload load caused by excessive vertical stress caused. However, we noticed that even without the influence of traffic load and road Surface structures are also degraded by environmental factors such as rainfall, significant temperature changes and uplift of the groundwater level.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.2

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本文編號(hào)：1436568