水工瀝青混凝土力學性能試驗研究
發(fā)布時間：2018-12-16 23:50
【摘要】：瀝青混凝土作為土石壩的防滲系統(tǒng)，在世界范圍內(nèi)得到了廣泛運用。但作為新興的水工防滲結(jié)構，隨著壩高越來越高，其安全穩(wěn)定性必須引起足夠的重視，因此對于瀝青混凝土心墻材料基本力學性能方面的研究就顯得很重要。本文通過靜三軸試驗對不同條件下的瀝青混凝土心墻材料的強度及變形特性進行了研究，得到了瀝青混凝土心墻材料力學性能的一些規(guī)律。主要研究工作及成果如下： 1、以瀝青混凝土心墻堆石壩為主題，系統(tǒng)地介紹了目前大壩的設計與建設現(xiàn)狀，，總結(jié)了前人在瀝青混凝土力學性能研究方面的成果和不足，在此基礎上進行了不同成型工藝及不同溫度、加載速率條件下的瀝青混凝土靜三軸試驗，研究瀝青混凝土的基本力學性能，為工程應用奠定基礎。 2、利用正交表對初選配合比試驗進行正交設計，然后對設計的試驗方案進行試驗，利用正交設計中極差分析法對試驗結(jié)果進行計算分析，并選出最優(yōu)配合比，為本文開展的力學試驗提供了科學基礎。 3、瀝青混凝土的力學性能對試驗溫度、圍壓等試驗條件比較敏感。同等試驗條件下，試驗溫度越低，瀝青混凝土破壞強度越高，初始切線模量越大，軸向破壞應變越�。粐鷫涸礁�，瀝青混凝土破壞強度越高，剪脹程度越小。 4、在瀝青混凝土配合比、試驗溫度、圍壓一定的試驗條件下，由于壓實機理不同，靜壓成型相較擊實成型的瀝青混凝土三軸試驗應力-應變曲線的峰值強度更高，初始切線模量更大，剪脹現(xiàn)象更加明顯。 5、剪切速率對瀝青混凝土三軸試驗結(jié)果的影響在不同的圍壓試驗條件下表現(xiàn)出相似的規(guī)律性：剪切速率越大，試樣剪脹越明顯，破壞強度越高，且破壞強度隨剪切速率增長的速率基本一致。 6、瀝青混凝土心墻作為大壩的防滲體是一個隱蔽性結(jié)構，目前對于土石壩瀝青混凝土心墻在自然環(huán)境溫度變化的循環(huán)條件下對瀝青混凝土力學性能的影響問題的研究還較少。本文通過在冷熱循環(huán)工藝條件下模擬瀝青混凝土試樣受溫度的循環(huán)變化，并通過三軸剪切試驗來反映瀝青混凝土試樣力學性能的變化。試驗結(jié)果初步表明經(jīng)過溫度循環(huán)后的瀝青混凝土破壞強度均出現(xiàn)了降低現(xiàn)象。 7、最后分別用鄧肯-張模型、鳳家驥修正雙曲線模型與南水非線性模型來描述瀝青混凝土心墻材料的應力-應變關系，并將擬合結(jié)果進行了對比分析。從對比結(jié)果可以看出，在本次試驗研究中南水非線性模型能更好地描述瀝青混凝土心墻材料的應力-應變關系。
[Abstract]:As a seepage control system of earth-rock dam, asphalt concrete has been widely used in the world. However, as a new hydraulic anti-seepage structure, with the dam height increasing, its safety and stability must be paid enough attention to, so it is very important to study the basic mechanical properties of asphalt concrete core wall materials. In this paper, the strength and deformation characteristics of asphalt concrete core wall materials under different conditions are studied by static triaxial test, and some laws of mechanical properties of asphalt concrete core wall materials are obtained. The main research work and achievements are as follows: 1. Taking the asphalt concrete core rockfill dam as the theme, this paper systematically introduces the present design and construction status of the dam, and summarizes the achievements and shortcomings of the previous researches on the mechanical properties of asphalt concrete. On this basis, static triaxial tests of asphalt concrete under different forming process, different temperature and loading rate were carried out, and the basic mechanical properties of asphalt concrete were studied, which laid a foundation for engineering application. (2) orthogonal design is carried out on the primary mix ratio test by orthogonal table, then the designed test scheme is tested, the test result is calculated and analyzed by using the range analysis method in the orthogonal design, and the optimum mix ratio is selected. It provides a scientific basis for the mechanical tests carried out in this paper. 3. The mechanical properties of asphalt concrete are sensitive to test temperature and confining pressure. Under the same test conditions, the lower the test temperature, the higher the failure strength of asphalt concrete, the greater the initial tangent modulus, the smaller the axial failure strain, and the higher the confining pressure, the higher the failure strength and the smaller the shear expansion degree of asphalt concrete. 4. Under certain experimental conditions of asphalt concrete mixture ratio, test temperature and confining pressure, because of different compaction mechanism, the peak strength of static pressure forming is higher than that of compacted asphalt concrete triaxial test stress-strain curve. The initial tangent modulus is larger and the shear expansion is more obvious. 5. The effect of shear rate on the triaxial test results of asphalt concrete shows similar regularity under different confining pressure test conditions: the larger the shear rate, the more obvious the shear expansion and the higher the failure strength. The failure strength is basically the same as the shear rate. 6. The asphalt concrete core wall is a concealed structure as the impervious body of the dam. At present, there is little research on the influence of the asphalt concrete core wall on the mechanical properties of the asphalt concrete under the condition of temperature change in the natural environment. In this paper, the temperature cycling of asphalt concrete samples is simulated under the condition of hot and cold cycling, and the mechanical properties of asphalt concrete specimens are reflected by triaxial shear test. The experimental results show that the failure strength of asphalt concrete after temperature cycling has been reduced. Finally, the stress-strain relationship of asphalt concrete core wall is described by Duncan Chang model, Fengjiaji modified hyperbolic model and Nanshui nonlinear model, and the fitting results are compared and analyzed. It can be seen from the comparison results that the nonlinear model of Nanshui in this experiment can better describe the stress-strain relationship of asphalt concrete core wall materials.
【學位授予單位】：長江科學院
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV431
本文編號：2383266
[Abstract]:As a seepage control system of earth-rock dam, asphalt concrete has been widely used in the world. However, as a new hydraulic anti-seepage structure, with the dam height increasing, its safety and stability must be paid enough attention to, so it is very important to study the basic mechanical properties of asphalt concrete core wall materials. In this paper, the strength and deformation characteristics of asphalt concrete core wall materials under different conditions are studied by static triaxial test, and some laws of mechanical properties of asphalt concrete core wall materials are obtained. The main research work and achievements are as follows: 1. Taking the asphalt concrete core rockfill dam as the theme, this paper systematically introduces the present design and construction status of the dam, and summarizes the achievements and shortcomings of the previous researches on the mechanical properties of asphalt concrete. On this basis, static triaxial tests of asphalt concrete under different forming process, different temperature and loading rate were carried out, and the basic mechanical properties of asphalt concrete were studied, which laid a foundation for engineering application. (2) orthogonal design is carried out on the primary mix ratio test by orthogonal table, then the designed test scheme is tested, the test result is calculated and analyzed by using the range analysis method in the orthogonal design, and the optimum mix ratio is selected. It provides a scientific basis for the mechanical tests carried out in this paper. 3. The mechanical properties of asphalt concrete are sensitive to test temperature and confining pressure. Under the same test conditions, the lower the test temperature, the higher the failure strength of asphalt concrete, the greater the initial tangent modulus, the smaller the axial failure strain, and the higher the confining pressure, the higher the failure strength and the smaller the shear expansion degree of asphalt concrete. 4. Under certain experimental conditions of asphalt concrete mixture ratio, test temperature and confining pressure, because of different compaction mechanism, the peak strength of static pressure forming is higher than that of compacted asphalt concrete triaxial test stress-strain curve. The initial tangent modulus is larger and the shear expansion is more obvious. 5. The effect of shear rate on the triaxial test results of asphalt concrete shows similar regularity under different confining pressure test conditions: the larger the shear rate, the more obvious the shear expansion and the higher the failure strength. The failure strength is basically the same as the shear rate. 6. The asphalt concrete core wall is a concealed structure as the impervious body of the dam. At present, there is little research on the influence of the asphalt concrete core wall on the mechanical properties of the asphalt concrete under the condition of temperature change in the natural environment. In this paper, the temperature cycling of asphalt concrete samples is simulated under the condition of hot and cold cycling, and the mechanical properties of asphalt concrete specimens are reflected by triaxial shear test. The experimental results show that the failure strength of asphalt concrete after temperature cycling has been reduced. Finally, the stress-strain relationship of asphalt concrete core wall is described by Duncan Chang model, Fengjiaji modified hyperbolic model and Nanshui nonlinear model, and the fitting results are compared and analyzed. It can be seen from the comparison results that the nonlinear model of Nanshui in this experiment can better describe the stress-strain relationship of asphalt concrete core wall materials.
【學位授予單位】：長江科學院
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV431
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