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机构地区:[1]中南大学土木建筑学院,湖南长沙410075 [2]贵州省交通规划勘察设计研究院,贵州贵阳550001
出 处:《中南大学学报(自然科学版)》2010年第3期1139-1145,共7页Journal of Central South University:Science and Technology
基 金:交通部西部交通建设科技项目(200631880237;20073182233);贵州省科技厅重大专项计划项目(20086013)
摘 要:基于岩质边坡可靠性受节理面的控制,节理面的随机分布导致边坡可靠系统具有高度不确定性,提出考虑节理几何参数不确定性的边坡可靠度分析方法。以厦蓉(厦门—成都)线高速公路某路堑边坡为例,通过概率图法和数理统计理论,对节理几何参数的概率分布类型进行研究,分析其不确定性,确定节理几何参数的概率密度和统计参数;考虑边坡双滑面破坏模式Sarma法分析安全系数的隐式函数式,根据响应面法重构安全系数近似显式解析表达式,建立以节理几何参数为随机变量的边坡可靠性分析模型,构建极限状态功能函数;以节理倾向、倾角和间距为随机变量,采用蒙特卡罗法产生符合随机变量分布类型的随机数,进行边坡可靠度分析。研究结果表明:所提出的分析模型和方法可反映构造控制的岩质边坡可靠性,为岩质边坡的可靠度分析和支护设计提供理论依据。Based on the fact that the stability of rock slope is mainly controlled by joint,and the random distribution of joint makes slope has high degree of uncertainty,the reliability analysis approach of rock slope considering uncertainty in joint geometric parameters governing slope stability was provided. In order to bring the approach,a rock cutting slope project in Xiarong highway was considered. The probability distribution models of joint geometric parameters were studied by probability map method and the theory of mathematical statistics to determine statistical parameters and probability density functions for each joint geometric parameters. Since factor of safety gained by Sarma method fitted to wedge failure had implicit function,based on the response surface method,the approximate explicit expression of calculation stability coefficient was made; the analytical model of reliability for slope stability analysis based on random properties of joint geometric parameters was explored,and the limit state function needed by rock slope reliability analysis was established. Taking joint origination and joint spacing as random variables,reliability analysis of rock slope was investigated by applying random data which were derived form Monte Carlo Method in accordance with the distribution models. The results show that the brought method can reflect the reliability of rock slope controlled by discontinuities,and that it can provide some reasonable and reliable references for rock slope stability evaluation and supporting design.
分 类 号:P642-22[天文地球—工程地质学]
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