A simplified method of Coulomb’s active earth pressure coefficient

Based on the relations between coefficient of coulomb’s active earth pressure and internal friction angle,grading angle,slope angle,the rules between coefficient of coulomb’s active earth pressure and different parameters were analyzed.On the basis of algebraic method,a simplified solution of coefficient of Coulumb’s active earth pressure was deduced.Then the coulomb’s method and the simplified method were compared.The results show that for Coulomb solution,the maximum error of the simplified solution is less than 14 percent on the condition of 95 percent probability.