2.2 Types of foundation failures(基础破坏类型) (ii)Punching shear failure(冲剪破坏) There is relatively high compression of the soil under the foundation accompanied by shearing in the vertical direction around the edges of the foundation(基边缘下地基产生 切被环 No heaving of the ground surface(基础内侧地面不出现隆 Pressure 通 Ground surface (地面) Sliding surface (滑动面) 阔
2.2 Types of foundation failures (基础破坏类型) (iii) Punching shear failure (冲剪破坏) ▪ There is relatively high compression of the soil under the foundation accompanied by shearing in the vertical direction around the edges of the foundation (基础边缘下地基产生垂 直剪切破坏 ) ▪ No heaving of the ground surface (基础两侧地面不出现隆 起 ) Pressure Settlement Sliding surface (滑动面) Ground surface (地面)
2.3 Ultimate bearing capacity of shallow foundations(浅基础极限承载力) Foundations can be classified as shallow and deep foundations. In general,if the depth of a foundation (D)is smaller than or equal to its breadth (B),i.e.D/B s 1,the foundation is classified as shallow foundation. 股认为，当基础的理深D 或 于基础宽度B时称为浅基础 Ground Surface 蘭 B (a)Shallow B (b)Deep
2.3 Ultimate bearing capacity of shallow foundations (浅基础极限承载力) ▪ Foundations can be classified as shallow and deep foundations. In general, if the depth of a foundation (D) is smaller than or equal to its breadth (B), i.e. D/B 1, the foundation is classified as shallow foundation. (一般认为,当基础的埋深D 小于或等于基础宽度B时,称为浅基础)