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在改进岩土技术分析和设计中,关键问题是安全性和可靠性的评价。用于风险评价的概率法的价值已得到普遍承认。在本文中或许并经常将注意力集中在应变软化特性的研究,这对渐进性破坏来说将是头等重要的。其他因素可能也很重要,但为了使从事土工研究的人尽可能地使公式简化,这里就不去涉及了。本文在对不排水条件下的应变软化性状的重要性作一讨论后,提出了一种确定破坏概率的方法,以便能广泛应用现有稳定性曲线图表。峰值和残余剪力强度(不排水条件下)被视作唯一的随机变量。用“残余因素”的概念来确定由峰值到残余抗剪强度在滑动面上发生的部分。从滑动面增长部分达到残余强度状态时,就可看出破坏的渐进性。应用三种不同概率分布或概率模式,并以实例来说明本文所提出的方法。
The key issue in improving geotechnical analysis and design is the assessment of safety and reliability. The value of the probabilistic method used for risk assessment has been generally recognized. In this article, and often and often, attention will be focused on the study of strain softening properties, which will be paramount to progressive destruction. Other factors may also be important, but not to be involved here so that geotechnical researchers can simplify the formula as much as possible. After discussing the importance of strain-softening behavior under undrained conditions, a method to determine the probability of failure is proposed so that the existing stability curve charts can be widely used. Peak and residual shear strength (undrained conditions) are considered as the only random variables. The concept of “residual factor ” is used to determine the portion of the sliding surface that occurs from peak to residual shear strength. From the growth of the sliding surface reaches the state of residual strength, you can see the gradual destruction. Three different probability distributions or probability patterns are applied, and examples show the method proposed in this paper.