浇筑式沥青混凝土三轴压缩蠕变特性试验研究
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摘要
浇筑式沥青混凝土是现代水利工程防渗心墙的主要材料。通过室内高压三轴蠕变压缩仪对3种不同沥青含量的浇筑式沥青混凝土试件在不同温度和偏应力状态条件下,进行了一系列的蠕变特性试验,研究沥青含量、温度对不同偏应力状态下浇筑式沥青混凝土蠕变特性的影响。结果表明:①同一沥青含量下,试件的蠕变随偏应力的增大而增大,且增长幅度受温度、沥青含量影响。②试件的蠕变与偏应力的关系,随温度的升高逐渐由线性向非线性转变;同一偏应力状态下,试件蠕变随沥青含量的增加呈非线性增大,且其增长速率随着沥青含量的增加而增大。③同一加载时间下,材料蠕变随温度的升高而增大,且蠕变速率随着沥青含量的增加而增大。④在三维空间,采用LogisticCum公式对试验数据进行三维曲面拟合,建立考虑温度、沥青含量及偏应力多因素影响的沥青混凝土蠕变模型,经验证模型曲面与试验曲面相拟度非常高。
Gussasphalt concrete is the main impervious material of core wall in hydraulic projects. A series of experiments of creep characteristics of asphalt concrete with three kinds of asphalt contents under different temperatures and different deviatoric stress state was conducted by using the high-pressure triaxial apparatus. The effects of asphalt contents and temperature on the creep characteristics of guss asphalt concrete under different deviatoric stress statements were studied. Test results indicate that the creep of specimen increases with deviatoric stress decreases under the same asphalt content and the growth is affected by the temperature and asphalt content. The relationships between the creep and deviatoric stress of the specimen gradually change from linear to nonlinear with the temperature increases. The creep of the specimen nonlinearly increases with the asphalt content increases under the same deviatoric stress state and the growth rate increases with the increase of asphalt content. The creep of the specimen increases with the temperature increases under the same loading time and the creep rate increases with the increase of asphalt content. In the three-dimensional space, the LogisticCum formula is used to process experimental data and the three-dimensional curved surface is obtained. The creep model of the guss asphalt concrete was established by considering the influence to the creep by many factors such as temperature, asphalt content and deviatoric stress. The predict surface of the creep model compared with the test surface has a very high fitting degree.
Gussasphalt concrete is the main impervious material of core wall in hydraulic projects. A series of experiments of creep characteristics of asphalt concrete with three kinds of asphalt contents under different temperatures and different deviatoric stress state was conducted by using the high-pressure triaxial apparatus. The effects of asphalt contents and temperature on the creep characteristics of guss asphalt concrete under different deviatoric stress statements were studied. Test results indicate that the creep of specimen increases with deviatoric stress decreases under the same asphalt content and the growth is affected by the temperature and asphalt content. The relationships between the creep and deviatoric stress of the specimen gradually change from linear to nonlinear with the temperature increases. The creep of the specimen nonlinearly increases with the asphalt content increases under the same deviatoric stress state and the growth rate increases with the increase of asphalt content. The creep of the specimen increases with the temperature increases under the same loading time and the creep rate increases with the increase of asphalt content. In the three-dimensional space, the LogisticCum formula is used to process experimental data and the three-dimensional curved surface is obtained. The creep model of the guss asphalt concrete was established by considering the influence to the creep by many factors such as temperature, asphalt content and deviatoric stress. The predict surface of the creep model compared with the test surface has a very high fitting degree.
引文
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[12] 中华人民共和国国家发展和改革委员会.水工沥青混凝土试验规程:DL/T 5362—2006[S].北京:中国电力出版社,2007:77-78.
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[2] 祁世京.土石坝碾压式沥青混凝土心墙施工技术[M].北京:中国水利水电出版社,2000:28-31.
[3] LEE H J, KIM Y R. Viscoelastic Constitutive Model for Asphalt Concrete Under Cyclic Loading[J]. Journal of Engineering Mechanics, 1998, 124(1): 32-40.
[4] 何晓民.沥青混凝土三轴应力条件下的力学特性[J].长江科学院院报,2000,17(2):37-40.
[5] 李志强,张鸿儒,侯永锋,等.土石坝沥青混凝土心墙三轴力学特性研究[J].岩土力学与工程学报,2006,25(5):997-1002.
[6] 朱晟,徐骞,王登银.沥青混凝土的增量蠕变模型研究[J].水利学报,2011,32(2):192-197.
[7] 陈宇,姜彤,黄志全,等.温度对沥青混凝土力学特性的影响[J].岩土力学,2010,31(7):2192-2196.
[8] 宋日英,李明霞,陈宇.沥青含量对浇筑式沥青混凝土力学特性的影响[J].人民长江,2011,42(10):83-86.
[9] 叶永,王凤,蔡宜洲.配合比参数对浇筑式沥青混凝土性能影响研究[J].三峡大学学报(自然科学版),2014,36(3):71-74.
[10] 宋日英,南东梅,陈宇.浇筑式沥青混凝土的原材料与配合比选择[J].铁道建筑,2012(4):142-144.
[11] 张伟,黄斌,张本蛟.水工室温沥青混凝土工程特性试验研究[J].水利学报,2015,46(增刊1):27-33.
[12] 中华人民共和国国家发展和改革委员会.水工沥青混凝土试验规程:DL/T 5362—2006[S].北京:中国电力出版社,2007:77-78.
[13] 中华人民共和国水利部.水工沥青混凝土施工规范:SL 514—2013[S].北京:中国水利水电出版社,2013:7-15.