干旱區(qū)夯土長城遺址表層病害微觀研究
發(fā)布時(shí)間：2019-01-08 16:00
【摘要】：以武威市明代夯土長城遺址為例,通過現(xiàn)場調(diào)查將干旱區(qū)夯土長城遺址表面病害劃分為風(fēng)蝕、雨蝕及表層剝離三類。結(jié)合室內(nèi)電鏡掃描、X射線衍射及激光粒度分析試驗(yàn),綜合研究遺址表層病害的形成及發(fā)育的微觀原因。結(jié)果表明:遺址表層中的土顆粒呈薄片狀,并按疊瓦狀緊密排列;母墻土顆粒表面粗糙,形狀呈角礫狀,顆粒無序緊密排列,夯筑痕跡明顯。遺址表層與母墻中的礦物含量相近,粘土礦物含量低。母墻土的砂粒含量高,粉粒含量低;表層土粉粒含量高,砂粒含量低。研究認(rèn)為:粘粒組粘土礦物的低含量導(dǎo)致遺址土顆粒間的連接力差,這是遺址表面雨蝕和風(fēng)蝕病害發(fā)育的內(nèi)在原因,表層與母墻的粒度組分與微觀結(jié)構(gòu)差異為遺址體的表層剝離提供了物質(zhì)與結(jié)構(gòu)基礎(chǔ)。
[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.
【作者單位】： 蘭州大學(xué)土木工程與力學(xué)學(xué)院;蘭州大學(xué)西部災(zāi)害與環(huán)境力學(xué)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(51408285)資助
【分類號(hào)】：TU746.1
本文編號(hào)：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.
【作者單位】： 蘭州大學(xué)土木工程與力學(xué)學(xué)院;蘭州大學(xué)西部災(zāi)害與環(huán)境力學(xué)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(51408285)資助
【分類號(hào)】：TU746.1
【相似文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前1條
1 徐彥榮;山丹新河驛明長城遺址差異性風(fēng)蝕特性研究[D];蘭州大學(xué);2014年
，本文編號(hào)：2404826
本文鏈接：http://www.sikaile.net/jianzhugongchenglunwen/2404826.html
最近更新
教材專著
