發(fā)布時間：2018-01-02 04:24

  本文關鍵詞：撒哈拉以南非洲地區(qū)長壽命路面結構組合設計研究　出處：《哈爾濱工業(yè)大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： 長壽命瀝青路面 結構組合 動力學響應

【摘要】：非洲全境約3000萬km2,目前約7.6億人口,在撒哈拉以南非洲地區(qū),公路交通系統(tǒng)在交通運輸中有重要的作用。作為一種交通基礎設施,公路對于撒哈拉以南非洲地區(qū)的交通起著至關重要的作用。在所有的交通方式中,公路運輸占的比重最大,承擔了撒哈拉以南非洲地區(qū)80%~90%的城市間和國家間的貨物運輸。撒哈拉以南非洲地區(qū)的公路網(wǎng)密度低于4.2公里/平方公里,其中具有鋪裝的公路為16%。目前路況服務條件良好的占44%,服務條件中等的占22%、較差的占34%。所以撒哈拉以南非洲的道路系統(tǒng)處于較低水平,非洲公路的現(xiàn)狀(道路老化、車轍損壞、破壞情況嚴重)并不能讓人滿意,已經(jīng)成為了桎梏經(jīng)濟發(fā)展的重要因素,因此有必要設法解決這種問題�；谝陨蠁栴},本文對撒哈拉以南非洲地區(qū)長壽命路面結構組合設計進行了如下幾個方面的研究:首先,通過查閱文獻列舉了撒哈拉以南非洲地區(qū)的路面結構現(xiàn)狀及主要問題,對瀝青路面的環(huán)境條件及交通狀況、常見的病害類型進行了較詳細的分析。其次,詳細介紹了撒哈拉以南非洲最普遍的瀝青路面結構設計方法。主要是根據(jù)現(xiàn)有規(guī)范總結了撒哈拉以南非洲地區(qū)高速公路瀝青路面設計過程中重載車交通量、計算風險、瀝青混合料計算參數(shù)取值、路面的承載等級、路面結構層的容許應變和實際應變的計算、路面結構各層的厚度驗算以及典型路面結構方案的確定。然后,以撒哈拉以南非洲的瀝青路面結構設計理論和方法為基礎,結合歐美、中國等長壽命路面的設計理念、設計要求、設計標準,設計出全厚式瀝青路面、半剛性結構路面、復合結構路面等三種較合理的路面組合形式。最后根據(jù)彈性層狀體系理論,使用國際上通用大型有限元軟件—ABAQUS對三種典型長壽命路面力學性能對比分析。對每種路面結構分別建立了兩種三維有限元路面結構模型進行有限元分析,一種是在靜載改為半正弦動荷載下進行不含裂縫路面結構的動力響應有限元分析,對比分析了三種結構力學響應的分布規(guī)律,及瀝青層層底拉應變、基層底部拉應變和土基頂面壓應變等指標的時程曲線變化規(guī)律;另一種是在移動均布荷載下進行表面含裂縫路面結構的斷裂力學分析,研究不同瀝青路面結構的裂縫擴展規(guī)律。
[Abstract]:With a population of about 30 million km2 across Africa and a population of about 760 million people, road transport systems play an important role in transport in sub-Saharan Africa as a transport infrastructure. Roads play a vital role in transport in sub-Saharan Africa, where road transport accounts for the largest share of all modes of transport. 80 / 90 per cent of inter-city and inter-country freight transport in sub-Saharan Africa. The road network in sub-Saharan Africa is less than 4.2 km / km2. The number of roads with pavement is 16. At present, 44% of the roads have good conditions of service, and 22% of them have medium service conditions. So the road system in sub-Saharan Africa is at a low level, and the current state of African roads (road aging, rutting damage, severe damage) is not satisfactory. Has become an important factor in the shackles of economic development, so it is necessary to try to solve this problem. Based on the above problems. In this paper, the combination design of long-life pavement structure in sub-Saharan Africa is studied in the following aspects: firstly, the paper enumerates the current situation and main problems of pavement structure in sub-Saharan Africa by consulting the literature. The environmental conditions and traffic conditions of asphalt pavement, common disease types are analyzed in detail. Secondly. The most common asphalt pavement structure design method in sub-Saharan Africa is introduced in detail. The traffic volume of heavy haul vehicles in the design process of highway asphalt pavement in sub-Saharan Africa is summarized according to the existing specifications. Calculation of risk, calculation of asphalt mixture calculation parameters, bearing grade of pavement, allowable strain of pavement structure layer and calculation of actual strain. The thickness of each layer of pavement structure and the determination of typical pavement structure. Then, based on the theory and method of asphalt pavement structure design in sub-Saharan Africa, combined with Europe and the United States. The design concept, design requirements and design standards of China's iso-long-life pavement are used to design the full-thickness asphalt pavement and semi-rigid pavement. There are three reasonable pavement combination forms such as composite structure pavement. Finally, according to the theory of elastic layered system. The mechanical properties of three typical long-lived pavements are compared and analyzed by using international large-scale finite element software-Abaqus. Two kinds of three-dimensional finite element pavement structure models are established for each pavement structure and finite element analysis is carried out for each kind of pavement structure. Analysis. One is the finite element analysis of the dynamic response of pavement structure without cracks under static load to half sinusoidal dynamic load. The distribution law of mechanical response of three structures and the tensile strain of asphalt layer bottom are compared and analyzed. The time history curves of the tensile strain at the base and the compressive strain at the top of the soil foundation; The other is to analyze the fracture mechanics of pavement structure with surface crack under moving uniform load, and to study the crack propagation law of different asphalt pavement structure.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U416.2
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本文編號：1367675