摘要
泾河下游南岸台塬边坡的滑坡灾害严重,本文中分析了滑坡的特征,通过计算边坡稳定性系数对台塬边坡进行了分类,对具有突发性和短期可变性的滑坡触发因素进行了分析,提出了滑坡治理的方法。研究结果表明,泾河下游南岸台塬边坡临界平衡边坡和不稳定边坡占80.8%,分布在西段和中段。滑坡发生的概率为多水年>平水年>少水年;年内夏雨集中的7月和秋雨集中的9月是易于发生滑坡的月份。灌溉期间的滑坡占68.8%,冬季发生的滑坡主要与灌溉有关。台塬区地下水位上升是诱发滑坡的根本原因,当地下水位上升与古土壤层重合时极易诱发滑坡。台塬区应根据地下水量平衡额定灌排量,使地下水位逐步下降至第五古土壤层之下是治理滑坡的根本之计。
This paper puts forward some solutions to the serious disasters of landslides visiting the southern-bank of the lower reaches of the Jinghe river, which is based on an introduction to the characteristics of landslides, the classification of tableland slopes through calculating the stability coefficient, and a through analysis on the paroxysmal and short-term variable causes for landslides. The major findings are as follows. The critical-balanced and imbalanced slopes making 80.8%, are located on the western and middle parts of the southern-bank of the Jinghe river. The probability of landslide occurrence follows this order： wet years 〉 normal years 〉 dry years; the July and September, when summer and autumn rains occur most frequently, tend to suffer from more landslides than the rest of a year. Such disasters in winters are chiefly associated with irrigation, which takes up 68.8%. The prime cause for landslides is the rise of the groundwater level in the tableland regions, especially when the groundwater rises to coincide the paleosol. Thus the essential point in bringing landslides under control is that the amount of irrigation in the tableland regions must be regulated in accordance with the amount of the groundwater so that the groundwater level can sink beneath the fifth paleosol.
出处
《水土保持学报》
CSCD
北大核心
2007年第5期187-191,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(50279019)
关键词
黄土台塬边坡
滑坡
稳定性
泾河下游
loess tableland slopes
landslide
stability
the lower reaches of the Jinghe river
