摘要
吐鲁番交河故城台地多元层状土质边坡由于风蚀而形成空腔的现象表明,不同类型的土具有不同的抗风蚀能力,抗风蚀能力的强弱是多因素影响的共同结果,微观结构是其中一个重要内因。风蚀速率是表征土抗风蚀能力强弱的重要物理量,研究运用风洞试验、微结构分析等手段揭示了风蚀速率与颗粒面积比、颗粒圆度、孔隙等效直径、孔隙充填比等微结构特征参数之间的良好对应关系;进而采用相关分析法分析并证实风蚀速率与各特征参数间的良好相关关系,应用回归分析方法建立3个试验风速下风蚀速率与单个参数和多个参数之间的回归方程,验证了微结构特征对土抗风蚀能力有显著影响,进而为土抗风蚀能力的评价提供了微观依据。
Because of the wind erosion, the empty cavity phenomenon is formed, which shows different soils have different abilities of resisting wind erosion at the mesa of Jiaohe ancient city, Turpan. The ability of resisting wind erosion is the results of many factors in which the microstructure is the important inner factor. Wind erosion rate is an important physical quantity of showing soil＇s abilities of resisting wind erosion. The experiment of wind tunnel and the microstructure analysis are applied to reveal better corresponding relationships between wind erosion rate and microstructure indexes, such as particle area ratio particle roundness, equal diameter of pore and filling ratio of pore. Furthermore, by adopting related analysis methods, better related relationships between wind erosion rate and the indexes of all characteristics are analyzed and approved. Through regression analysis method, the regression equations between the three kinds of wind erosion rates and odd index, even multi-index are built; and the microstructure characters which have notable influence on the ability of resisting wind erosion of soils are validated. Above results also provide micro basis for wind erosion evaluation of soils.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第9期2741-2746,2752,共7页
Rock and Soil Mechanics
基金
国家十一五科技支撑计划课题"土遗址保护关键技术研究"(2006BAK30B02)
关键词
多元层状土
抗风蚀能力
风蚀速率
微结构特征参数
回归分析
multivariate layered soil
ability of resisting wind erosion
wind erosion rate
parameter of microstructure character
regression analysis
作者简介
崔凯，男，1980年生，博士研究生，从事土质边坡变形破坏机理和风蚀机制的研究工作。
通信作者：谌文武，男，1966年生，教授，主要从事地质工程、岩土工程、文物保护工程科研与教学工作。E-mail：sungp@lzu．edu．cn
