摘要
堆积体边坡在中国西南地区分布广泛,库水位和地震是诱发堆积体边坡的主要因素,研究地震与库水位作用下堆积体边坡的稳定性具有重要的工程意义。以云南省金鸡达旦河大桥典型库岸边坡为研究对象,基于应力渗流耦合理论,在10个不同的库水位升降条件下,研究堆积体边坡的稳定性;基于等效线性分析理论,利用有限元和极限平衡M-P方法,进行了不同地震荷载下水库边坡的动态反应研究,从安全系数和永久位移两个方面对边坡进行了动态稳定评价。结果表明,库水位变化过程中该边坡安全系数大于临界值,边坡失稳的可能性小;在Ⅷ度地震作用时,边坡的动力安全系数和永久位移均表明其失稳风险极高。研究成果可为类似库岸堆积体边坡在库水位变化和地震作用下的安全评估提供技术支撑。
The colluvial slopes are widely distributed in southwestern China,and the reservoir pooling water level variation and earthquakes are the main factors inducing the stability issues in colluvial slopes.Studying the stability of colluvial slopes under the effects of earthquakes and reservoir pooling water level fluctuations is of the great engineering significance.The stability e-valuation of a typical bank slope of the Jinji Dadan River Bridge in Yunnan Province in presented in this paper.Based on the coupling theory of the stress and seepage,the stability of a colluvial slope under 1o different conditions of the reservoir pooling water level variations is evaluated in the paper.Based on the theory of equivalent linear analysis,the dynamic response of the water reservoir slopes under different seismic loads are studied by using the finite element and limit equilibrium M-P methods.The dynamic stability evaluation of slopes is performed from two aspects:the factor of safety and the permanent displacement,respectively.The results indicate that the factor of safety of the slope is greater than the critical value during the change of res-ervoir pooling water level,and the possibility of the slope instability is small;When subjected to a Vll degree earthquake,the dynamic factor of safety and the permanent displacement of the slope indicate a very high risk of instability.The investigation results can provide a technical support for the safety assessment of slopes similar to the bank deposits under the variations in reservoir pooling water level and seismic action.
作者
唐红波
王立纬
蒋文鹏
罗丽
王兴
TANG Hongbo;WANG Liwei;JIANG Wenpeng;LUO Li;WANG Xing(Dali DayangEryun ExpresswayCo.Ltd.,Dali 671000;China Nuclear Power Engineering Co.Ltd.,Zhengzhou 450000;State Key Laboratory for Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071;University of Chinese Academy of Sciences,Beijing 100049)
出处
《土工基础》
2024年第3期496-502,共7页
Soil Engineering and Foundation
基金
云南交投科技创新计划项目(NO.YCIC-YF-2022-17)。
关键词
堆积体边坡
库水位变化
地震
稳定性
安全系数
永久位移
Colluvial Slope
Reservoir Pooling Water Level Variation
Earthquake
Stability
Factor of Safety
Permanent Displacement
