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为了分析巴东新城区库岸斜坡蓄水后的深部稳定特征,首先,选择巴东新城区扇形斜坡中轴线的白土坡库岸作为典型库岸,以深300余米深部监测钻孔岩芯资料为依据,根据软弱带分布、岩体完整性及岩性特征对深部岩体结构分带;然后,基于各带内岩体的地质强度参数GSI,应用Hoek-Brown准则估算岩体强度参数;最后,采用FLAC数值模拟方法分析了库岸斜坡蓄水后的稳定性特征。结果表明:随着水位的上升斜坡稳定性有下降趋势,但下降值并不明显,白土坡库岸斜坡处于整体稳定状态;当强度折减值至极限状态时,剪应变增量值集中区位于6～10层软弱带集中分布的岩层内,受地震作用时剪应变增值集中区向斜坡深部发展,斜坡潜在滑动面顺层发育;斜坡失稳的前提是前缘向斜反倾段完全塑性贯通。
In order to analyze the deep stability characteristics of the reservoir bank slope in the new urban area of Padang, firstly, the white soil bank at the central axis of fan-shaped slope in Badong New City is selected as the typical reservoir bank, and the deep core drilling data According to the distribution of weak zone, integrity and lithology of rock mass, the deep rock mass structure is zoned. Then, based on the geologic intensity parameters GSI of each in-zone rock mass and the Hoek-Brown criterion, the rock mass strength parameters are estimated. Finally, The FLAC numerical simulation method is used to analyze the stability characteristics of reservoir banks after impounding. The results show that the slope stability declines with the rise of water level, but the decline value is not obvious, and the slope of bank slope on the white soil slope is in a steady state. When the strength reduction value reaches the limit state, In the rock formations with 6 ~ 10 weak zones concentrated, the shear stress concentration concentrated zone develops to the deep part of the slope under the action of earthquake, and the potential sliding surface of the slope develops in bedding; the precondition of slope instability is the complete plasticity of the anticlinal section .