干旱区生态环境知识资源中心(Arid): 硅酸钾材料加固土遗址耐风蚀颗粒元模拟分析

Arid

	硅酸钾材料加固土遗址耐风蚀颗粒元模拟分析
其他题名	Particle simulation on the effect of potassium silicate reinforcement of ancient earthen site soil to reduce wind erosion
	张晓平; 王思敬; 李黎; 王彦兵
来源期刊	岩土力学
ISSN	1000-7598
出版年	2012
卷号	33 期号:11 页码:3465-3471
中文摘要	西北干旱地区土遗址受风化、风蚀等破坏严重,大量土质文物亟待加固抢修。加固后土遗址的各耐环境因素及加固机制研究是土遗址加固的理论基础。首次引入颗粒元程序PFC,通过改变模型中颗粒间平行连接强度,对硅酸钾(简称PS)加固前后的土样进行数值模拟。在考虑实际土样颗粒粒径和密度的前提下,拟合了生土PS加固前后的抗压和抗拉强度,并将拟合后的颗粒元模型应用于风蚀模拟。通过随机生成挟沙风颗粒,以一定的速度撞向土体,模拟挟沙风的吹蚀作用。挟沙风颗粒数与循环步数成正比例,因此,可以用挟沙风颗粒数来代表吹蚀时间的长短。挟沙风颗粒的速度则代表挟沙风风速。模拟结果表明,在20 m/s的挟沙风吹蚀作用下,风蚀程度随吹蚀时间的增加而增大,未加固土样的风蚀程度增幅度远大于加固土样;同样吹蚀时间条件下,加固土样的抗风蚀强度明显高于未加固土样。这些模拟结论与风洞试验结果的统计规律一致。本研究拟合的颗粒流模型可进一步应用于PS加固机制研究及耐风蚀、雨蚀、冻融等诸环境影响分析研究。
英文摘要	There are many ruins of ancient earthen sites in Northwest China, many of which are destroyed by violent processes of the wind erosion. Reinforcements are needed to protect these cultural heritages. The mechanism of reinforcement and resistance of environmental factors are the fundamental of the reinforcement theory. Particle flow code is used to simulate the soil before and after potassium silicate (PS) reinforcement, which is achieved by changing the parallel bond strength between particles. Compressive and tensile strengths of soil are calibrated with considering the soil particle size and density. The calibrated models are used to simulate the processes of the wind erosion. Sand-driving wind flow is represented by random generating particles with original vertical velocity. Results show that under the erosion of 20 m/s sand-driving wind flow, the magnitude of erosion increases as wind flow duration increases. The increasing magnitude of erosion of soil before reinforcement is much larger than that of reinforcement soil. The resistance erosion capability of reinforcement soil is greater than soil before reinforcement. These conclusions are generally agreed with the indoor wind-tunnel test results. The calibrated particle flow model of this research can be used for further analysis of ancient earthen site soil, such as wind erosion, water erosion, freeze thawing etc.
中文关键词	土遗址 ; 风蚀 ; 挟沙风 ; 颗粒流模拟
英文关键词	ancient earthen sites wind erosion sand-driving wind flow particle flow code simulation
类型	Article
语种	中文
收录类别	CSCD
WOS类目	History
CSCD记录号	CSCD:4666532
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/378765
作者单位	张晓平, 敦煌研究院古代壁画保护国家文物局重点科研基地, 中国科学院工程地质力学重点实验室, 敦煌, 甘肃 736200, 中国.; 王思敬, 中国科学院地质与地球物理研究所, 中国科学院工程地质力学重点实验室, 北京 100029, 中国.; 王彦兵, 中国科学院地质与地球物理研究所, 中国科学院工程地质力学重点实验室, 北京 100029, 中国.; 李黎, 中国文化遗产研究院, 北京 100871, 中国.
推荐引用方式 GB/T 7714	张晓平,王思敬,李黎,等. 硅酸钾材料加固土遗址耐风蚀颗粒元模拟分析[J],2012,33(11):3465-3471.
APA	张晓平,王思敬,李黎,&王彦兵.(2012).硅酸钾材料加固土遗址耐风蚀颗粒元模拟分析.岩土力学,33(11),3465-3471.
MLA	张晓平,et al."硅酸钾材料加固土遗址耐风蚀颗粒元模拟分析".岩土力学 33.11(2012):3465-3471.