干旱区土遗址盐渍带风蚀损耗效应微观机制研究  

Study of microscopic mechanism of effect of aeolian erosion ullage at salinization belt on earthen ruins in arid region

作　　者：崔凯[1,2,3,4] 谌文武[2,4] 王旭东[2,4] 韩文峰[2,4] 朱彦鹏[1,3] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州730050 [2]兰州大学西部灾害与环境力学教育部重点实验室,兰州730000 [3]西部土木工程防灾减灾教育部工程研究中心,兰州730050 [4]国家古代壁画保护工程技术研究中心,甘肃敦煌736200

出　　处：《岩土力学》2012年第4期1167-1172,共6页Rock and Soil Mechanics

基　　金：国家十二五科技支撑计划课题(No.2010BAK67B16);教育部西部灾害与环境力学重点实验室开放基金(No.klmwde201006);古代壁画保护国家文物局重点科研基地开放课题;兰州理工大学博士科研发展基金(No.BS04200902)

摘　　要：基于西北干旱地区典型土遗址盐渍带盐分野外观测和定性分析结果,初步总结了土遗址盐渍土带特征并阐释了风蚀损耗效应的概念;通过对掺入不同含量2种盐渍带常见盐分Na2SO4和NaCl,并经历干湿循环的遗址土重塑样的风洞模拟试验和微结构分析试验,揭示了盐渍带中常见盐分发生的盐渍过程会对遗址土抗风蚀能力产生显著的影响;并通过统计学分析方法证实了试样的风蚀速率与有关孔隙的部分微结构特征参数之间存在着良好的对应关系;最后结合定性分析和试验研究结果,从微观角度对土遗址盐渍带土的风蚀损耗机制进行了初步的讨论。Based on salinity field observations and qualitative analysis results at salinization belt of the typical earthen ruins in the research area, the paper summarizes the characteristics of earthen ruins with saline soil and generates a brief concept of aeolian erosion ullage effect. And then, on the basis of wind tunnel simulation experiment and microstructure analysis results of reconstituted samples going through drywet circulation after being mixed with different content of common salts Na_2SO_4 and NaC1, it reveals that the saline process of those salts have significant impact on antierosion ability of the site, and a good correlation existing between microstructure characteristics parameters of pore and wind erosion rate of the samples under saline process is also proved by statistical analysis method. Finally, with a combination of the qualitative analysis and the experimental results, depletion mechanism of the effect of aeolian erosion ullage at the salinization belt of earthen ruins is preliminarily discussed from a microcosmic standpoint.

关 键 词：干旱区 土遗址 盐渍带 风蚀损耗效应 微观机制 

分 类 号：TU42[建筑科学—岩土工程]