摘要
在高应力状态下堆石料的抗剪强度具有明显的非线性。强度非线性有指数和对数两种描述形式。对几座高土石坝的坝坡稳定分析表明,使用对数形式的非线性强度准则得到的坝坡计算安全系数比按线性强度准则计算的安全系数要高。现行规范所规定的许可安全系数,是与许多年的大量的用偏低的线性强度所作的稳定计算相适应的,偏于保守,改用非线性强度后应作适当的提高,对其提高的程度进行了统计分析,并给出了用非线性强度指标稳定分析时安全系数取值标准的建议值。
The Mohr failure envelopes for rockfill exhibit significant nonlinearity at high stresses. Nonlinear strength is described by exponential and logarithmic mode. Stability analysis of high rockfill slope indicates that the safety factor of nonlinear analysis is bigger than that of linear analysis. Safety factor based on linear rule should be properly increased. A criterion of safety factor is suggested.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2004年第5期793-797,共5页
Rock and Soil Mechanics
关键词
高土石坝
稳定分析
堆石
非线性抗剪强度
Nonlinear systems
Safety factor
Shear strength
Slope stability
Stresses
