2.4 Allowable bearing capacity of shallow foundations Differentiate z with respect to B,the maximum value ofz can be determined by equating dz/dβtoO(z最大值从设 导数dz/dB为零找出) -d YπV ytanΦ Rearrange the above expression into the following form: +yd1+ πcotΦ cot-7+2.4 Allowable bearing capacity of shallow foundations ▪ Differentiate z with respect to b, the maximum value of z can be determined by equating dz/db to 0 (z最大值从设 导数dz/db为零找出 ) ▪ Rearrange the above expression into the following form: d tan c 2 cot q d z max −     −      +    −   −   =             +    −   +              +    −  +    + +    −   = 2 cot cot c 2 cot d 1 2 cot z q max