《21Bearingcapacityoffoundation.ppt

Chapter 2 Bearing capacity of foundation 2.1 Introduction (前言) 2.1 Introduction (前言) 2.2 Types of foundation failures (基础破坏类型) 2.2 Types of foundation failures (基础破坏类型) 2.2 Types of foundation failures (基础破坏类型) 2.3 Ultimate bearing capacity of shallow foundations (浅基础极限承载力) 2.3 Ultimate bearing capacity of shallow foundations (浅基础极限承载力) 2.3.1 Prandtl’s method (普朗特公式) 2.3.1 Prandtl’s method (普朗特公式) 2.3.1 Prandtl’s method (普朗特公式) 2.3.1 Prandtl’s method (普朗特公式) 2.3.1 Prandtl’s method (普朗特公式) 2.3.2 Soil with weight (考虑土体重量) 2.3.2 Soil with weight (考虑土体重量) 2.3.2 Soil with weight (考虑土体重量) Ultimate bearing capacity factors (极限承载力因素) Chapter 2 Bearing capacity of foundation (基础承载力) 2.4 Allowable bearing capacity of shallow foundations (浅基础容许承载力) 2.4 Allowable bearing capacity of shallow foundations 2.4 Allowable bearing capacity of shallow foundations 2.4 Allowable bearing capacity of shallow foundations 2.4 Allowable bearing capacity of shallow foundations 2.4 Allowable bearing capacity of shallow foundations 2.4 Allowable bearing capacity of shallow foundations 2.5 Design values of bearing capacity (地基承载力的设计值) 2.5 Design value of bearing capacity (地基承载力的设计值) * * In lesson of soil mechanics, we’ve learned Types of foundation failures (基础破坏的类型) Ultimate bearing capacity of shallow Foundations (浅基础地基极限承载力) Prandtl’s method: smooth foundation and weightless soil (普朗特公式:基底光滑与土无重量) Terzaghi’s method: rough foundation (太沙基公式:基底粗糙) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Ultimate bearing capacity (qu) is defined as the pressure which would cause shear failure of the supporting soil immediately below and adjacent to a foundation. (当基底压力增大到极限承载力时,地基出现剪切破坏) A foundation must satisfy two fundamental requirements: (设计基础要满足两个要求 ) the factor of safety Fs against shear failure of the supporting soil must be adequate, a value between 2 and 3 normally being specified (地基达到剪切破坏的安全糸数 Fs 要适当,一般在2至3之间 ) Evalua