摘要
风蚀是西北干旱地区土遗址破坏的主要动力机制和成因,强烈的风蚀作用致使许多土遗址坍塌殆尽,导致这一不可再生资源的破坏。通过对土遗址的室内和现场风蚀模拟试验研究发现,经PS(高模数硅酸钾)材料加固后土遗址的抗风蚀能力明显增强。室内试验发现,风蚀量随风速的增长而增加、随风蚀时间延长近线性增长,PS材料浓度大于5%的加固试样,即使风速达20 m/s时,风蚀量均小20(kg/m2)·h,抗风蚀强度提高6～10倍。现场模拟试验结果表明,加固材料的入渗深度和用量直接影响加固效果,中浓度PS材料加固的墙面抗风蚀能力最强。因此,选择适当的PS材料浓度、提高加固材料的渗透力是土遗址保护加固的关键,将对西北地区土遗址科学保护的全面开展起到重要的指导作用。
There are many ruins of ancient earthen sites in Northwest China, which are precious mankinds culturalheritage, and their valuable artistic value is rareworldwide. But the violent processes of the wind erosion caused many ancient earthen sites collapsed. Many investigation indicate that the wind erosion is the main power mechanism and the genesis resulting in destruction of the ancinet earthen rains. So this paper make the indoor wind-tunnel test and field wind erosion test to study the performance against wind erosion. The experimental result conclude that the bear for wind erosion of the consolidated ancient earthen sites are hugely increased,. The results of the indoor wind-tunnel test indicate that the wind erosion amount is increased with wind speed and with test time. At the same time, the laboratory experiment discovered that even if the wind speed reaches 20 m/s, the wind erosion amount of the samples reinforced with more than 5 % of PS is less than 20 （kg/m^2.h）, and the against wind erosion intensity enhances 6-10 times. According to the result of the field wind erosion test, the wall consolidated with 3 % or 5 % of PS is good bear for wind erosion, and the depth of penetration and the amount of PS material directly affect reinforcingt effect, In sum, the key to protecing Ruins is to choosing the suitable consistence PS material and is to enhancing penetrability of PS material So this reinforced method could be effective in scientific protecting the rare ancient earthen sites from rigorous natural conditions in Northwest China.
出处
《岩土力学》
EI
CSCD
北大核心
2008年第2期392-396,共5页
Rock and Soil Mechanics
基金
国家科技支撑重点项目资助(No.2006BAK30B02)
国家自然科学基金(No.40672193)
关键词
土遗址
风蚀
PS材料
保护
The ancient sites
wind erosion
PS material
protection
