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| Based on the uncertainty risk analysis theory,the depositional environment of the karst dam region is investigated. The method to describe the infiltration characteristics is systematically studied. The variability of permeability and the describing method of the corrosion rock mass are investigated. A new method measuring the variance of permeability is proposed,namely the error spreading function approach based on 3σ principle. The extreme values of the statistics parameters such as the width,spacing of... Based on the uncertainty risk analysis theory,the depositional environment of the karst dam region is investigated. The method to describe the infiltration characteristics is systematically studied. The variability of permeability and the describing method of the corrosion rock mass are investigated. A new method measuring the variance of permeability is proposed,namely the error spreading function approach based on 3σ principle. The extreme values of the statistics parameters such as the width,spacing of the crack,and radius of the karst pipe can be calculated according to 3σ principle. And then the variance of permeability is obtained by using the cube law. By discriminating the jointed rock mass and pore karst cave,Kriging′s random field theory and Vanmarcke′s relativity theory on the study of geotechnical parameter variance are renewed and improved. Based on the geology statistical data in the field,the variance of permeability of the corroded rock mass in the grouting adit of Qingjiang Shuibuya project in a typical karst region in south China is computed. The proposed method is proved practical and simple. With variance of permeability provided,the random waterpower model can be constituted and then random permeability calculation can also be carried out. | 通过对溶蚀岩体渗透变异特性的研究,提出了一种确定渗透性变异的方法,即基于“3σ法则”的误差传播函数法。先根据“3σ法则”求得溶蚀岩体统计变量的端点,再利用误差传播函数法基于立方定律求得溶蚀岩体的渗透性变异。将裂隙岩体与孔隙溶洞区别考虑,补充和完善了克立格随机场理论和Vanmarcke 相关性理论对岩土参数变异的研究。基于现场灌浆平硐揭露的工程地质统计资料,对清江水布垭工程左岸帷幕线上部分段进行了渗透性变异的量化研究。研究结果表明,该方法简单适用,且在确定岩溶坝区渗透参数的统计量基础上,可进行随机渗流计算。 | Based on the stochastic finite element method (SFEM), the probability analysis has been done on the seepage failure of embankments. The influences of the variation of the coefficient of permeability, the change of the flood level and the geometry of the embankment on the failure probability of seepage are studied. The failure probability increases with the increasing of the variation of the coefficient of permeability. When the coefficient of variation increases to a certain value, the failure probability would... Based on the stochastic finite element method (SFEM), the probability analysis has been done on the seepage failure of embankments. The influences of the variation of the coefficient of permeability, the change of the flood level and the geometry of the embankment on the failure probability of seepage are studied. The failure probability increases with the increasing of the variation of the coefficient of permeability. When the coefficient of variation increases to a certain value, the failure probability would cease to increase and then descend slightly. The failure probability increases with the increasing of the flood level. It also increases with the increasing of the angle of the embankment slope. Particularly, when the slope ratio is greater than 1:2.5 the failure probability increases rapidly. | 基于随机有限元理论进行了堤防渗透失稳概率分析,探讨了渗透系数变异性、洪水位变化、堤防几何尺寸变化对渗透失稳概率的影响。结果表明,随着渗透变异系数的增加,渗透失稳概率基本呈线性增长,当变异系数增大到一定程度时渗透失稳概率保持不变,随后略有下降;随着汛期水位的升高,堤防渗透失稳的概率不断变大;渗透失稳概率随着堤防坡度变陡而不断地增加,尤其是在堤防坡比大于1:2.5时,其渗透失稳概率增加得非常快。 | | |
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