合肥新桥国际机场膨胀土工程性质与矿物成分的研究.doc

合肥新桥国际机场膨胀土工程性质与矿物成分的研究 【中文摘要】膨胀土是一种会给工程带来严重破坏的高塑性粘土,对机场跑道的路基会有很强的变形破坏作用。本文通过大量室内土工试验,对合肥新桥机场膨胀土进行了研究,得到了膨胀土的含水量、自由膨胀率、液塑限、最优含水量和最大干密度、无侧限抗压强度、抗剪强度、压缩系数和压缩模量、50kPa膨胀率、膨胀力、收缩系数和体缩率等一系列参数,从而研究新桥机场膨胀土的物理、力学性质以及胀缩特性,并根据膨胀土的各种分类方法,依据试验所得参数为机场膨胀土进行分类。为了研究掺石灰对膨胀土的影响,本文还进行了不同掺灰比的以上各种试验,并进行对比分析,为新桥机场膨胀土改良确定最佳掺灰比。本文还以X射线衍射分析为手段,对该区膨胀土的矿物成分进行定性和定量的分析和计算,来研究膨胀土的矿物成分及其对该区膨胀土工程性质的影响。; 【Abstract】 Expansive soil is one kind of high plasticity clay which may bring roadbed engineering of airport runway heavy failure deation. Using a mass of laboratory tests, the thesis researches the expansive soil in Hefei Xinqiao International Airport. Parameters such as moisture content, free swelling ratio, liquid limit and plastic limit, optimum water content and maximum dry density, unbound compressive-strength, shear strength, compression coefficient and compression modulus, swelling capacity with 50kPa pressure, expansive force, shrinkage coefficient and bulk shrinkage ratio were used for studied physical properties, mechanical properties and swell-contraction properties. On the basis of categorization s of expansive soil and parameters of test, the *** categorize the expansive soil of Xinqiao International Airport. By way of studying the expansive soil under the influence of the lime and *** sure the best rate of added lime on expansive soil of Xinqiao Airport, the date of added lime tests were contrasted analyzed. Qualitative analysis and quantitative calculate of the mineral composition are also studied by using x-ray diffraction .