土坡稳定性的分位概率法和分项系数法对比

发布时间：2018-01-03 07:06

本文关键词：土坡稳定性的分位概率法和分项系数法对比　出处：《岩土工程学报》2017年01期 　论文类型：期刊论文

【摘要】：对于土质边坡稳定性分析,由于岩土参数变异系数波动范围较大,分项系数设计法(PFM)计算结果不够稳定,尚未在工程中广泛推行。分位概率设计法(QVM)是一种新的可靠度设计方法,它以单一的分位概率?进行极限状态设计。将分位概率设计法应用于边坡稳定分析,针对土质边坡,进行了抗剪强度参数(c,f)的分项系数和分位概率的标定和误差分析。分析结果表明:1在土体抗剪强度参数(c,f)的均值、变异系数、坡角和坡高在取值范围内变化时,分位概率值(?)相比分项系数c f?,?,其标定结果更加稳定;2相比分项系数设计法,分位概率设计法给定的极限状态,其实际可靠度βA更稳定,与目标可靠度βT之间的误差更小,设计更可靠;3分项系数法对各变量分别使用不同的分项系数,而分位概率法对所有变量采用相同的分位概率(?),设计更简洁。
[Abstract]:Analysis for soil slope stability, the geotechnical parameters of the coefficient of variation of a larger range, partial factor design method (PFM) calculation results are not stable enough, has not been widely implemented in the project. A probabilistic design method (QVM) is a new reliability design method, it takes the quartile probability of a single limit? The state will be divided into design. A probabilistic design method applied to slope stability analysis for soil slope, the shear strength parameters (C, f) and the partial coefficient quantile probability calibration and error analysis. The analysis results show that: 1 the shear strength parameters of the soil (C, f). The mean variation coefficient, slope angle and the slope height changes within the range, a probability value (?) compared with the correlation coefficient C f?,?, the calibration result is more stable; 2 compared to partial factor design method, a probabilistic design method for a given limit state, the actual reliability of beta A is more stable, and the target reliability The error between the beta T is smaller and the design is more reliable. The 3 partial coefficient method uses different partial coefficients for each variable, and the probability of quantile is the same for all variables, and the design is more succinct.

【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51479001,41471052) 中央高校基本科研业务费项目(2014JBZ013)
【分类号】：TU43
【正文快照】： 基于可靠度理论的边坡稳定性分析已经被很多学者和设计人员所接受[1-2]。中国水利水电工程边坡设计规范[3]明确建议:如有条件,对于1级边坡可采用基于抗滑稳定安全系数的方法进行可靠度分析。DL/T5395—2007《碾压式土石坝设计规范》[4]把安全系数法作为为抗滑稳定计算基本方法

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