摘要
冰水堆积体作为一种特殊的第四系堆积体,广泛分布于西南高海拔山区,在水库库水的浸泡、风浪侵蚀、水流淘蚀以及水位变动引起的干湿交替等作用的长期影响下,其岸坡的失稳模式具有不一样成因机制。通过对雅泸高速公路瀑布沟库区段冰水堆积体岸坡的结构特征以及已有的变形破坏特征进行分析研究,初步归纳了该段岸坡的4种主要失稳模式:蠕滑-拉裂模式、侵蚀-剥蚀模式、淘蚀-滑移-拉裂模式和淘蚀-拉裂-滑塌模式,并重点针对典型失稳模式的成因机制进行分析研究。阐明了引起冰水堆积体岸坡塌岸发生的内在因素是坡体结构特征以及地质环境条件,而水库水位变动、库水的长期浸泡以及风浪侵蚀则是引起岸坡失稳的主要外在因素。
As a special kind of quaternary system accumulation, aqueoglacial deposits are widely distributed in the high alti-tude mountains of southwest China. Under the influence of reservoir water submergence, wind and wave erosion, scour of flow and wet - dry cycling by water level fluctuation, the bank collapse pattern of aqueoglacial deposits differs. Based on the analysis of structural features and failure characteristics of a bank slopes constituted of aqueoglacial deposits in a highway located at Pub- ugou reservoir area, four kinds of main instability modes are established, namely creep - fracture pattern, erosion - denudation pattern, elutriation - slip - fracture pattern and elutriation - fracture - slump pattern, and the genetic mechanism of the typical pattern was studied. It is concluded that the structural characteristics and geological environmental conditions are the internal fac- tors, while the external factors include fluctuation of reservoir water level, long-term submergence and wind-wave erosion.
出处
《人民长江》
北大核心
2013年第3期20-24,共5页
Yangtze River
关键词
冰水堆积体
变形破坏机制
塌岸模式
结构特征
aqueoglacial deposits
deformation and failure mechanisms
bank collapse pattern
structural features
