干旱区夯土长城遗址表层病害微观研究
发布时间：2019-01-08 16:00
【摘要】：以武威市明代夯土长城遗址为例,通过现场调查将干旱区夯土长城遗址表面病害划分为风蚀、雨蚀及表层剥离三类。结合室内电镜扫描、X射线衍射及激光粒度分析试验,综合研究遗址表层病害的形成及发育的微观原因。结果表明:遗址表层中的土颗粒呈薄片状,并按叠瓦状紧密排列;母墙土颗粒表面粗糙,形状呈角砾状,颗粒无序紧密排列,夯筑痕迹明显。遗址表层与母墙中的矿物含量相近,粘土矿物含量低。母墙土的砂粒含量高,粉粒含量低;表层土粉粒含量高,砂粒含量低。研究认为:粘粒组粘土矿物的低含量导致遗址土颗粒间的连接力差,这是遗址表面雨蚀和风蚀病害发育的内在原因,表层与母墙的粒度组分与微观结构差异为遗址体的表层剥离提供了物质与结构基础。
[Abstract]:Taking the site of the Great Wall in Ming Dynasty as an example, the surface diseases of the Great Wall site in arid area are divided into three types: wind erosion, rain erosion and exfoliation. Combined with scanning electron microscope, X-ray diffraction and laser particle size analysis test, the microcosmic causes of the formation and development of the surface layer disease of the site were studied. The results show that the soil particles in the surface layer of the site are thin and closely arranged in imbricate shape, and the surface of the soil particles in the mother wall is rough, the shape is breccia, the particles are disordered and closely arranged, and the ramming marks are obvious. The mineral content in the surface layer of the site is similar to that in the mother wall, but the clay mineral content is low. The sand content is high and the silt content is low in the mother wall soil, while the silt content in the surface soil is high and the sand content is low. It is considered that the low content of clay minerals in clay group leads to the poor connection between soil particles, which is the internal reason for the development of rain erosion and wind erosion disease on the site surface. The difference of grain size composition and microstructure between the surface and the main wall provides the material and structure basis for the surface exfoliation of the site body.
【作者单位】： 兰州大学土木工程与力学学院;兰州大学西部灾害与环境力学教育部重点实验室;
【基金】：国家自然科学基金(51408285)资助
【分类号】：TU746.1
本文编号：2404826
[Abstract]:Taking the site of the Great Wall in Ming Dynasty as an example, the surface diseases of the Great Wall site in arid area are divided into three types: wind erosion, rain erosion and exfoliation. Combined with scanning electron microscope, X-ray diffraction and laser particle size analysis test, the microcosmic causes of the formation and development of the surface layer disease of the site were studied. The results show that the soil particles in the surface layer of the site are thin and closely arranged in imbricate shape, and the surface of the soil particles in the mother wall is rough, the shape is breccia, the particles are disordered and closely arranged, and the ramming marks are obvious. The mineral content in the surface layer of the site is similar to that in the mother wall, but the clay mineral content is low. The sand content is high and the silt content is low in the mother wall soil, while the silt content in the surface soil is high and the sand content is low. It is considered that the low content of clay minerals in clay group leads to the poor connection between soil particles, which is the internal reason for the development of rain erosion and wind erosion disease on the site surface. The difference of grain size composition and microstructure between the surface and the main wall provides the material and structure basis for the surface exfoliation of the site body.
【作者单位】： 兰州大学土木工程与力学学院;兰州大学西部灾害与环境力学教育部重点实验室;
【基金】：国家自然科学基金(51408285)资助
【分类号】：TU746.1
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1 徐彦荣;山丹新河驿明长城遗址差异性风蚀特性研究[D];兰州大学;2014年
，本文编号：2404826
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