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加拿大Oldman坝的库岸边坡主要由近水平、互层的砂岩及泥岩构成 ,自 1993年开始蓄水以来库岸边坡一直处于变形之中。文章在简介区域地质条件、工程地质条件和水库蓄水诱发变形的基础上 ,对变形诱发机制进行了讨论。基于监测资料分析 :(1)由于水库库岸边坡的卸荷裂隙十分发育 ,提供了快速的水力通道 ,蓄水期水对库岸边坡稳定存在不利影响 ;(2 )该例的泥岩不存在膨胀性 ;(3)库岸边坡变形是由于水的快速渗透导致有效应力降低和泥岩软化 ,库岸边坡应力重新调整引起的 ;(4 )对于软岩边坡 ,特别是库岸软岩边坡变形稳定分析比强度稳定分析更重要
The reservoir bank slope of the Oldman Dam in Canada is mainly composed of nearly horizontal and interbedded sandstone and mudstone. The bank slope has been undergoing deformation since the reservoir was started in 1993. Based on the introduction of regional geological conditions, engineering geological conditions and reservoir-induced deformation, this paper discusses deformation-induced mechanism. Based on the monitoring data analysis: (1) Due to the well-developed unloading fissures on the bank slope of the reservoir bank, a rapid hydraulic passage is provided, and the impact of the reservoir water on the bank slope stability is adversely affected; (2) (3) The deformation of bank slope is caused by the decrease of effective stress and the softening of mudstone due to the rapid infiltration of water, and the readjustment of the stress of bank slope; (4) For the soft rock slope, especially the reservoir bank soft Stability analysis of rock slope stability is more important than strength stability analysis