發(fā)布時(shí)間：2018-05-20 09:25

  本文選題：級(jí)配碎石基層 + 層間粘結(jié)行為��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：級(jí)配碎石作為瀝青路面的柔性基層,具有造價(jià)低廉、低溫抗裂性以及水穩(wěn)定性好等優(yōu)點(diǎn)。然而級(jí)配碎石通常強(qiáng)度不高,與面層以及封層的粘結(jié)力不足,由此導(dǎo)致高溫性能不佳且容易出現(xiàn)層間推移破壞,在實(shí)際應(yīng)用中受到較大限制。因此,本文以“基于細(xì)觀力學(xué)的級(jí)配碎石基層瀝青路面層間粘結(jié)行為研究”項(xiàng)目為依托,在提高級(jí)配碎石基層強(qiáng)度的基礎(chǔ)上,開(kāi)展了基于室內(nèi)足尺直剪試驗(yàn)和高溫車(chē)轍試驗(yàn)的級(jí)配碎石柔性基層與瀝青混合料的層間粘結(jié)行為及其高溫性能研究。首先,論文以級(jí)配碎石強(qiáng)度理論為基礎(chǔ),級(jí)配碎石強(qiáng)度主要是通過(guò)抗剪強(qiáng)度來(lái)體現(xiàn)。通過(guò)控制關(guān)鍵篩孔以及粗細(xì)集料比例,設(shè)計(jì)出A、B、C三種不同粗細(xì)程度的骨架密實(shí)型級(jí)配碎石。在此基礎(chǔ)上,通過(guò)CBR、回彈模量以及動(dòng)力CBR等基礎(chǔ)性能試驗(yàn),對(duì)級(jí)配碎石柔性基層進(jìn)行全面力學(xué)性能評(píng)價(jià),得到不同粗細(xì)程度的骨架密實(shí)型級(jí)配碎石的排序依次為:B級(jí)配C級(jí)配A級(jí)配。接下來(lái),為研究級(jí)配碎石的層間粘結(jié)行為,以抗剪強(qiáng)度為評(píng)價(jià)指標(biāo),采用自主研發(fā)的簡(jiǎn)易直剪儀進(jìn)行級(jí)配碎石層與瀝青面層的抗剪性能評(píng)價(jià)。首先通過(guò)材料性能檢測(cè),對(duì)集料、瀝青等組成材料進(jìn)行篩選測(cè)定;在此基礎(chǔ)上,完成了柔性基層的路面結(jié)構(gòu)的設(shè)計(jì);然后,選取基層級(jí)配、封層厚度以及透層油量作為主要研究因素,進(jìn)行三因素三水平的正交試驗(yàn),結(jié)果表明:級(jí)配碎石基層對(duì)層間粘結(jié)行為影響最為顯著,稀漿封層厚度次之,相比之下,透層油量對(duì)結(jié)果影響并不顯著�；谝陨显囼�(yàn),論文采用離散單元法,通過(guò)PFC2d數(shù)值軟件進(jìn)行直剪試驗(yàn)的仿真分析。第一步,進(jìn)行貫入試驗(yàn)?zāi)M,獲取級(jí)配碎石微觀性能參數(shù);第二步,進(jìn)行直剪試驗(yàn)?zāi)M,以細(xì)微觀角度描述級(jí)配碎石的相關(guān)力學(xué)行為,發(fā)現(xiàn)級(jí)配碎石體現(xiàn)出典型的散粒體特性,即整體的一致性以及個(gè)體的非一致性的統(tǒng)一。在此基礎(chǔ)上,進(jìn)一步調(diào)整模型參數(shù),獲取與室內(nèi)足尺直剪試驗(yàn)擬合度較高的仿真模型。最后,進(jìn)行級(jí)配碎石基層瀝青路面高溫穩(wěn)定性的室內(nèi)測(cè)評(píng)。采用車(chē)轍試驗(yàn),同直剪試驗(yàn)一致,選取基層級(jí)配、封層厚度以及透層油量作為主要研究因素,進(jìn)行三因素三水平的正交試驗(yàn)。結(jié)果表明:影響路面高溫穩(wěn)定性的因素依次為:級(jí)配碎石基層封層厚度透層油量。該結(jié)論與層間粘結(jié)行為的試驗(yàn)及仿真效果保持一致;并經(jīng)過(guò)對(duì)比試驗(yàn)結(jié)果發(fā)現(xiàn),級(jí)配碎石基層與瀝青面層的層間粘結(jié)行為與其高溫穩(wěn)定性保持一種正相關(guān)關(guān)系。
[Abstract]:As the flexible base of asphalt pavement, graded crushed stone has the advantages of low cost, low temperature crack resistance and good water stability. However, the strength of graded macadam is not high, and the bond with surface layer and seal layer is not enough, which leads to poor performance at high temperature and easy to occur interlaminar damage, which is limited in practical application. Therefore, based on the project of "Research on interlayer bonding behavior of graded Macadam Base Asphalt pavement based on Meso-Mechanics", on the basis of improving the strength of graded crushed Stone Base, Based on indoor full-scale direct shear test and high-temperature rutting test, the interlaminar bond behavior and high temperature performance of graded macadam flexible base and asphalt mixture were studied. First of all, the paper is based on graded crushed stone strength theory, graded crushed stone strength is mainly reflected by shear strength. By controlling the key sieve hole and the ratio of coarse and fine aggregate, three kinds of skeleton dense grained macadam with different thickness degree were designed. On this basis, the mechanical properties of graded macadam flexible base are evaluated by the basic performance tests, such as CBR, modulus of resilience and dynamic CBR. The order of skeleton dense gradation is: B gradation C gradation A gradation. Then, in order to study the interlaminar bond behavior of graded macadam, the shear strength is taken as the evaluation index, and the shear performance of graded macadam layer and asphalt surface layer is evaluated by a simple direct-shear instrument developed by ourselves. First of all, through material performance testing, the aggregate, asphalt and other components of materials are screened and determined; on this basis, the design of pavement structure of flexible base is completed; then, the selection of base grading, As the main research factors, the thickness of sealing layer and the oil content of permeable layer were studied by orthogonal experiments at three factors and three levels. The results showed that graded crushed stone base had the most significant influence on interlaminar bond behavior, and the thickness of slurry seal layer was the second, in contrast, the thickness of slurry seal layer was the second. The effect of oil permeation on the results is not significant. Based on the above experiments, the paper uses discrete element method and PFC2d numerical software to simulate the direct shear test. In the first step, the microscopic performance parameters of graded crushed stone are obtained by the penetration test simulation. In the second step, the direct shear test simulation is carried out to describe the related mechanical behavior of graded crushed stone from a fine angle, and it is found that graded crushed stone exhibits typical granular properties. That is, the unity of the whole and the inconsistency of the individual. On this basis, the model parameters are further adjusted to obtain a simulation model with high fitting degree compared with the indoor full-scale direct shear test. Finally, the indoor evaluation of high temperature stability of asphalt pavement with graded macadam base is carried out. The rutting test is adopted, which is consistent with the direct shear test. The main research factors are the base level gradation, the sealing layer thickness and the oil content of the permeable layer, and the orthogonal experiments of three factors and three levels are carried out. The results show that the factors influencing the high temperature stability of pavement are as follows: the amount of oil through the sealing layer of graded crushed stone base. The conclusion is consistent with the experimental and simulation results of interlaminar bonding behavior, and it is found that there is a positive correlation between the interlaminar bonding behavior of graded macadam base and asphalt surface layer and its high temperature stability.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U414

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本文編號(hào)：1914068