摘要
本文对三峡工程蓄水运行期间岩体损伤劣化导致高陡岸坡失稳机理进行了研究。三峡峡谷地段岩体具有上硬下弱的二元易滑地质结构,位于水库消落区的相对脆弱岩体易于出现损伤劣化并导致强度下降。在现场调查及监测基础上,本文建立了水位下降干燥状态、水位上升饱和状态及过渡状态下消落区劣化岩体的损伤本构模型,提出了采用水位周期涨落后劣化带的峰值应力与劣化带有效应力之比作为高陡岸坡危岩溃屈失稳稳定系数的定量评价方法。对巫峡段箭穿洞危岩进行了应用研究,结果表明,本文所提出的稳定性评价方法可以很好地表征高陡岸坡宏观塌落、变形和基座应力非线性增加等演化状态,弥补了常规极限平衡稳定性分析方法不能准确刻画溃屈失稳演化过程的缺陷。针对高陡岸坡的溃屈失稳破坏模式,提出了基座劣化岩体补强加固的防护方案,为三峡库区高陡危岩的风险管控提供了支撑。
This paper studies the damage evolution of the high-steep reservoir banks caused by the water storage operation of the Three Gorges Project.It is prone to become unstable for the rocky bank located in the canyon area with the dual geological structure of hard at the upper and soft at the lower layers.The strength of the base rock mass in the fluctuation zone tend to decrease due to the deterioration.On the ba-sis of on-site investigation and long-term monitoring,the damage constitutive models of base rock mass un-der dry,saturated,and transition states were established.A quantitative evaluation method was proposed,and the ratio of the peak stress to the effective stress of the fluctuation zone was used as the stability fac-tor of the crashed failure.The application research of Jianchuandong dangerous rock mass in Wuxia Gorge was carried out.The results showed that the stability evaluation method proposed in this paper could track the evolution states of macro slump,deformation and nonlinear increase of base pressures.Compared to the traditional limit equilibrium stability analysis method,this new method could reflect the process from dam-age to collapse.As for the crashed failure of high-steep rocky bank,the reinforcement program of the base rock mass was formulated.The related contents can provide guidance for the risk management of high-steep rocky bank in the Three Gorges Reservoir Area.
作者
殷跃平
王鲁琦
赵鹏
张枝华
黄波林
王雪冰
YIN Yueping;WANG Luqi;ZHAO Peng;ZHANG Zhihua;HUANG Bolin;WANG Xuebing(China Institute of Geological Environment Monitoring,Beijing 100081,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Chongqing 208 Geological Environment Research Institute Co.Ltd,Chongqing 400700,China;Hubei Key laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang 443002,China)
出处
《水利学报》
EI
CSCD
北大核心
2022年第4期379-391,共13页
Journal of Hydraulic Engineering
基金
国家自然科学基金项目(42077234)
中国博后面上基金项目(2021M700608)
重庆市地质灾害防治中心科研项目(KJ-2021047)。
关键词
三峡库区
高陡岸坡
损伤劣化
溃屈失稳
Three Gorges Reservoir
high-steep reservoir banks
damage evolution
crashed failure
