甘肃环县黄土边坡破坏类型及机理研究

Study on damage forms and mechanism of loess slope in Huanxian of Gansu Province

在野外调查、室内试验的基础上,对甘肃环县黄土边坡的变形破坏类型及机理进行了研究。研究表明,该区黄土边坡破坏主要分为坡面冲刷、边坡上部滑塌和坡脚冻融破坏三种,并对三种类型的破坏机理进行了深入分析,最后得出黄土含水率低、结构稳定性差、其自身的渗透性和湿陷性为边坡破坏提供了前提条件,而多种不良地质现象的发育破坏了边坡的完整性,成为水流冲蚀的优势通道,影响了边坡的稳定性。

Based on the field survery and lab experiment, this paper analyses the damage mechanism of the loss slope in Huanxian of GanSu Province. Research shows that there are three forms about the damage of the loss slope in HuanXian, i.e. erosion of sloping surfaces, creeping on the top of slope and freezing-thawing the base of the slope. The generalizes the conclusion damage damage at mechanism of the three forms is analyzed in this paper. At last, the author of damaging slope stability, antecedent condition is that the lowing percent moisture content, the bad structural stability, osmotic permeability and powerful collapsibility of the loess in the area, the integrity of the slope is damaged by the unfavorable geological phenomenon, preponderant entryway is formed for rainfall simulator erosion, loess slope damaged, eventually.