本文選題：路面基層　切入點：水泥穩(wěn)定碎石　出處：《湖南大學(xué)》2015年碩士論文

【摘要】：路面水損害是公路早期常見病害之一,快速排出路面結(jié)構(gòu)層內(nèi)的水分是降低水損害的有效途徑,除了地表排水和地下排水外,還可以設(shè)置排水基層來加強路面內(nèi)部排水。開級配水泥穩(wěn)定碎石作為排水基層材料,以其良好的排水性能,近年來得到了廣泛關(guān)注,學(xué)者們在理論和實踐上的研究成果也得到了廣泛的應(yīng)用。本文旨在從理論和試驗的角度對開級配水泥穩(wěn)定碎石材料使用性能進行研究,期望研究成果對實際工程有所幫助。本文首先研究了材料的組成設(shè)計,提出了合理的級配以及最佳水泥摻量,以粗開級配和細開級配作為研究對象,引入常規(guī)級配作為對比,考慮到工程實際應(yīng)用中的靜力壓路機和振動壓路機兩種施工方式,本文以室內(nèi)靜力壓實成型和振動壓實成型進行模擬,主要研究內(nèi)容包括:強度性能、剛度性能、收縮性能、抗凍性能、抗沖刷性能、滲水性能。結(jié)果表明:振壓成型試件強度、剛度性能要顯著大于靜壓成型;開級配水泥穩(wěn)定碎石干縮系數(shù)是常規(guī)級配的1.6倍以上,增加細集料含量可以有效降低干縮系數(shù),但溫縮系數(shù)會增大,振動成型試件收縮性能要優(yōu)于靜壓成型;與常規(guī)級配相比,開級配水泥穩(wěn)定碎石抗凍性能高出10%左右,抗沖刷能力顯著增強;靜壓成型開級配水泥穩(wěn)定碎石抗凍性能優(yōu)于振壓成型,而在抗沖刷性能上則相反;開級配水泥穩(wěn)定碎石滲水性能高于常規(guī)級配6倍以上,有效空隙率與滲透系數(shù)之間具有良好的冪指數(shù)關(guān)系。分形理論作為新興學(xué)科已經(jīng)不再局限于數(shù)學(xué)研究,在土木工程領(lǐng)域的應(yīng)用也獲得了成功,本文將之應(yīng)用于開級配水泥穩(wěn)定碎石材料的研究上,從理論和試驗入手,研究了級配分形維數(shù)的計算方法,以及其與有效空隙率之間的關(guān)系,計算了體積分形維數(shù)。結(jié)果表明:有效空隙率與級配分形維數(shù)間具有良好的二次曲線關(guān)系,級配分形維數(shù)越小,材料排水性能越好。最后,結(jié)合湖南省界化壟至茶陵(壟茶)高速公路排水基層試驗路段實際工程情況,研究了排水基層的主要設(shè)計控制指標,包括設(shè)計強度、排水基層厚度、最大滲流時間、排水基層排水系統(tǒng)等。結(jié)果表明:試驗路段完全滿足設(shè)計要求,排水基層排水系統(tǒng)與一般邊緣排水系統(tǒng)各有優(yōu)劣。
[Abstract]:Pavement water damage is one of the common diseases in the early stage of highway. It is an effective way to reduce water damage by rapidly discharging the moisture in pavement structure layer, except surface drainage and underground drainage. It is also possible to set up a drainage base to strengthen the internal drainage of the pavement. As a drainage base material, the open graded cement stabilized crushed stone, with its good drainage performance, has received extensive attention in recent years. The research results of scholars in theory and practice have also been widely used. The purpose of this paper is to study the performance of cement-stabilized macadam from the theoretical and experimental point of view. It is expected that the research results will be helpful to the practical engineering. Firstly, the composition design of the material is studied, and the reasonable gradation and the optimum cement content are put forward. The coarse opening gradation and the fine opening gradation are taken as the research objects, and the conventional gradation is introduced as the contrast. Considering the two construction methods of static roller and vibratory roller in practical application, this paper simulates the static compaction and vibration compaction in the laboratory. The main research contents include: strength performance, stiffness performance, shrinkage performance. The results show that the strength and stiffness of the specimen formed by vibration compression are significantly higher than that of static compression molding, and the dry shrinkage coefficient of cement stabilized macadam with open grading is more than 1.6 times that of the conventional grade. Increasing the content of fine aggregate can effectively reduce the dry shrinkage coefficient, but the temperature shrinkage coefficient will increase, the shrinkage property of vibration forming specimen is better than that of static compression molding, and the frost resistance of open graded cement stabilized macadam is about 10% higher than that of conventional gradation. The anti-scour ability of open graded cement stabilized macadam by static pressure molding is better than that by vibratory compression molding, but on the contrary, the permeability of open graded cement stabilized macadam is more than 6 times higher than that of conventional gradation. There is a good exponential relationship between effective porosity and permeability coefficient. As a new subject, fractal theory is no longer limited to mathematical research, and its application in civil engineering has also been successful. In this paper, the method of calculating fractal dimension of gradation and the relationship between fractal dimension and effective voidage are studied, which is applied to the study of open graded cement stabilized macadam material. The volume fractal dimension is calculated. The results show that there is a good conic relationship between effective porosity and gradation fractal dimension. The smaller the fractal dimension of gradation is, the better the drainage performance of the material is. Combined with the actual engineering situation of the experimental section of drainage base of Hunan Province, the main design control indexes of drainage base, including design intensity, thickness of drainage base, maximum seepage time, are studied. The results show that the experimental section completely meets the design requirements, and the drainage base drainage system and the general edge drainage system have their own merits and demerits.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

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