原创《最大承载力状态下全风化花岗岩路基变形特性和控制方法》：这是一篇与风化论文范文相关的免费优秀学术论文范文资料,为你的论文写作提供参考。
摘 要：为了研究南方湿热条件下全风化花岗岩填筑路基的科学方法,以提高路基在运营期的耐久性和稳定性,对全风化花岗岩进行了湿法重型击实和加州承载比试验.结果表明：承载力最大状态下全风化花岗岩的含水率比最佳含水率更接近天然含水率.为进一步了解其湿胀特性,通过改变初始含水率进行了膨胀率试验,得到了全风化花岗岩在不同初始含水率下的干密度衰变规律；通过改进的固结试验对 析了全风化花岗岩在最大承载力和最大干密度状态时的变形特性.结果显示：和常规的以最大干密度控制方法相比,全风化花岗岩在最大承载力状态下抗变形能力和稳定性更好.按最大承载力状态铺筑了全风化花岗岩路基试验段并进行了现场回弹模量和压实度检测,结果表明：最大承载力状态下全风化花岗岩路基完全能满足下路床94区的压实要求,为了满足路面对路基回弹模量的要求,基于变形等效原理提出刚度补偿设计方法,以确保全风化花岗岩路基整体刚度和耐久性.
关键词：路基工程；全风化花岗岩；最大承载力；固结试验；变形等效；刚度补偿
中图分类号：U416.02
文献标志码：A文章编号：16744764（2016）01010907
Abstract：
To improve the durability and stability of subgrade on service, we aimed to research on a scientific method for filling subgrade with completely decomposed granite soil under the hot and humid condition in south. Wet heavy compaction test and California bearing ratio test were conducted on the completely decomposed granite. The results show that the moisture content of completely decomposed granite was more similar to natural moisture content than the optimum moisture content under the maximum bearing capacity. Swelling experiment was carried out to obtain the regularity of density decay by variation of initial moisture content. The modified consolidation test was applied to analyze the deformation properties on the maximum bearing capacity and the maximum dry density status respectively. The results show that compared to maximum dry density condition, the resistance of deformation and the stability on the maximum capacity status was enhanced. Moreover, the experimental subgrade filling with completely decomposed granite was constructed on the maximum bearing capacity status. The insitu bearing plate test and compactness test were conducted, and the results show that the compactness could totally meet the demand of lower road bed which is the 94% compactness region. To meet the design modulus of the subgrade that the pavements demands, we proposed a method of stiffness compensation based on principle of equivalent deformation to ensure the stiffness and the durability of the completely decomposed granite subgrade effectively.
Keywords：subgrade engineering； completely decomposed granite； maximum bearing capacity； consolidation test； principle of equivalent deformation； stiffness compensation
全风化花岗岩属于特殊土,在中国南方广泛分布,主要特点是云母含量高[1],结构松散、水稳性差、粘结力小、抗剪强度低[2].采用全风化花岗岩进行路基填筑的铁路或公路经过多年的运行之后,在交通循环荷载作用和自然条件侵蚀下容易产生严重的永久变形,导致路基路面出现翻浆冒泥等病害[3],以往缺乏对其路用特性的重视,因此,许多工程性质尚没有进行系统地研究,实际工程中多以弃土换填和化学改良为主.近年来,由于铁路、道路工程、建筑以及其他土木工程越来越多涉及到全风化花岗岩领域,且变废为宝、环境友好的绿色理念被广大建设部门所提倡,为此,学者们对全风化花岗岩开展了相关的研究.Hossain等[45]研究了全风化花岗岩非饱和状态下的抗剪强度和膨胀特性.Sun等[6]通过三轴试验对全风化花岗岩的力学和变形特性进行了研究.Wan等[7]研究了全风化花岗岩小变形条件下的应力路径.李志勇等[89]利用动三轴试验,研究了全风化花岗岩在重复荷载作用下的动态特性,分析了动强度和围压及压实度的相关关系.周德泉等[10]通过侧限压缩试验研究了全风化花岗岩的累积变形和湿化特性.
风化论文参考资料：
结论：最大承载力状态下全风化花岗岩路基变形特性和控制方法为关于对不知道怎么写风化论文范文课题研究的大学硕士、相关本科毕业论文药品风化是什么意思论文开题报告范文和文献综述及职称论文的作为参考文献资料下载。
