摘要
风蚀是影响我国干旱地区土质边坡稳定的重要因素之一,尤其对由抗风蚀能力强弱不同的土层共同组合形成的多元层状土质边坡而引起的差异性风蚀效应最为显著,而目前对于其影响因素和机制研究是非常有限的。因而选取我国干旱多风的吐鲁番交河故城台地的多元层状陡立边坡为典型实例,基于风蚀而诱发的变形破坏现象,提出多元层状土质边坡差异性风蚀效应的概念,并运用野外调查、取样、颗粒分析实验、微结构分析实验、风洞实验等手段揭示了风的类型、挟沙风的风速、土的颗粒组成、微观结构等因素为其主控因素;并进一步结合工程地质学和经典力学理论进行分析,提出了由其导致的边坡变形破坏演化机制,为防治和监测此类边坡的变形破坏提供一些有益的参考。
Wind erosion is one of the important factors of the impact of soil slope stability in arid regions. Particularly, the effect of differential wind erosion is the most obvious to the soil slopes made up with different soils that have various abilities to resist wind erosion. However, it is very limited to study its influencing factors and mechanism. Therefore, a typical example is the deformation and damage of the multivariate layered steep soil slope by wind erosion in Jiaohe ancient city mesa in Turpan which is located in the arid and windy region in China. The concept of different wind erosion effects in the multi-element layered soil slope is put forward on the basis of the deformation and damage phenomenon of wind erosion, some methods such as field survey, sampling, grain size analysis and experiment, micro-structural, analysis and wind tunnel test in the laboratory are applied to reveal the main control factors of the differences in wind erosion effects for soil slope, for example, the type of wind, the sediment-carrying wind speed, soil grain composition, and micro-structure. Moreover, the further analysis based on engineering geology and theories of classical mechanics is made, the deformation and damage evolutionary mechanism of the slopes by different wind erosion effects are put formard, and some useful references for controlling and monitoring the deformation and damage of those slopes are provided.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2009年第9期1421-1426,共6页
Chinese Journal of Geotechnical Engineering
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
土质边坡
差异性风蚀效应
研究
multi-element layer
soil slope
differential wind erosion
study
