摘要
隐伏地裂缝在黄土中的扩展机理,其影响的范围、程度等问题,都是城市工作者所广泛关注和亟待解决的重要问题。为了研究黄土中逆断层地裂缝的扩展机理和扩展特征,参照正断层大型物理模型试验,利用数值模拟的方法,建立了三维数值分析模型,进行了黄土中逆断层的扩展机理研究。研究表明,隐伏逆断层地裂缝活动时,在地裂缝的上端,土体单元受到拉、压、剪的共同作用,裂缝很快被贯通,因而在其上端形成了破裂区,但向两侧的扩展有限;地裂缝的下盘在地裂缝活动时,受到的影响较小,即逆断层主要影响地裂缝的上盘,而对下盘影响甚微;同时,逆断层的影响范围和深度都明显小于正断层。由此可见,逆断层地裂缝活动特征明显区别于正断层,在黄土中的扩展有其独特之处。
The crack as one kind of urban disaster, is bringing more and more tremendous influence on urban construction. How is the ground-fissure extending and its influencing scope, degree and so on is urgent attention and earnestly to solve for city subway construction. Specially the reversed fault as one kind of research form, its research results are relatively few. In order to look into the ground-fissure spreading mechanics reason and extending characteristic in loess, the author incorporated large-scale physical simulative experiment results and numerical simulation results to make verification. The research indicated that the reversed fault has its unique merit in loess expansion. At last, some new meaningful conclusions were drawn.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2009年第5期47-50,共4页
Coal Geology & Exploration
基金
国家自然科学基金重点项目(4053021)
陕西省自然科学基金项目(2007606)
长安大学校青年基金项目(06Q06)
关键词
地裂缝
逆断层
数值模拟
ground-fissure
reversed fault
numerical simulation
