多种外界随机荷载综合作用下的坝坡风险评价
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摘要
对于边坡的风险评价,目前研究领域主要涉及的是边坡系统在自身岩土体材料力学参数为随机变量情况下的风险性,而对于综合考虑外界多种自然因素随机性的影响却研究甚少。只有少数学者对随机水位与随机水平地震力共同作用下的边坡结构风险进行了初探,但进行水文分析时,仅考虑了随机水位情况下由静水压力所引起的边坡失效风险,而忽略了渗流因素对坝坡破坏风险的影响。针对这种不足,在以往研究的基础上,考虑了渗流因素的作用,对多种外界随机荷载综合作用下的坝坡风险进行了评价,并以沟后水库大坝下游坝坡为实例,将渗透变形与地震力作用滑坡风险进行了耦合,从而对多因素共同作用下的边坡风险进行了评价。
For risk analysis of slope, present study field is focused on the case of parameters of rock and soil material itself being random variables. The influence of natural multi-random factors is considered little. Only a few of scholars have done preliminary research on the risk of slope under random water level and horizontal earthquake force. But in hydrological risk analysis, just the failure risk caused by hydrostatic pressure was considered. The risk caused by seepage was ignored. In view of this shortage and on the basis of previous study, seepage factor is introduced and the risk of dam slope is evaluated under external random multi-loadings. As a typical example, the means is applied to downstream slope of Gouhou dam. In this project, the influence of permeated deformation and earthquake force are coupled and slope risk is evaluated under natural multi-random factors.
For risk analysis of slope, present study field is focused on the case of parameters of rock and soil material itself being random variables. The influence of natural multi-random factors is considered little. Only a few of scholars have done preliminary research on the risk of slope under random water level and horizontal earthquake force. But in hydrological risk analysis, just the failure risk caused by hydrostatic pressure was considered. The risk caused by seepage was ignored. In view of this shortage and on the basis of previous study, seepage factor is introduced and the risk of dam slope is evaluated under external random multi-loadings. As a typical example, the means is applied to downstream slope of Gouhou dam. In this project, the influence of permeated deformation and earthquake force are coupled and slope risk is evaluated under natural multi-random factors.
引文
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[2]贾超.基于可靠度的结构风险分析及其在南水北调工程中的应用研究[博士学位论文D].南京:河海大学,2003.
[3]麻荣永.土石坝风险分析方法及应用[M].北京:科学出版社,2004
[4]王卓甫.防洪堤结构风险计算模型探讨[J].水利学报,1998,(7):64-67.WANG Zhuo-fu.Risk calculation model for flood levee structure[J].Journal of Hydraulic Engineering,1998.(7):64-67
[5]贾超,刘宁.地震作用下土坡可靠度风险分析[J].岩石力学与工程学报,2005,24(4):703-707.JIA Chao,LIU Ning.Slope risk analysis under the earthquake effect[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(4):703-707.
[6]张锐,迟世春.地震加速度动态分布及对高土石坝坝坡抗震稳定的影响[J].岩土力学,2008,29(4):1072-1076.ZHANG Rui,CHI Shi-chun.Discussion on seismic coefficient of high earth-rock dams and its influence on dam slope seismic stability[J].Rock and Soil Mechanics,2008,29(4):1072-1076.
[7]陈祖煜.土质边坡稳定分析[M].北京:中国水利水电出版社,2003.
[8]EARTH Scientific Consultants W.Mecann and associates[R].[S.l.]:[s.n.],1994.
[9]田景元,刘汉龙.土石坝下游坝坡砌块在地震作用下的稳定性评价[J].岩土力学,2009,30(1):135-138.TIAN Jing-yuan,LIU Han-long.Assessment of aseismic stability of pavement plate on downstream slope of embankment dam[J].Rock and Soil Mechanics,2009,30(1):135-138.
[10]黄超,王水林.基于不平衡推力法的边坡可靠度分析[J].岩土力学,2007,28(10):613-615.HUANG Chao,WANG Shui-lin.Slope's reliability analysis based on imbalance thrust force method[J].Rock and Soil Mechanics,2007,28(10):613-615.
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