Soil arching effect is one of the important phenomena in interaction of anti-slide piles and soil. By usingthe FEM software and a new method of the mutability of normal stress,the occurrence of soil arching effect indouble-row piles and the effects of factors on the soil arching effect such as distance of piles,row spacing and thelayout have been studied. Meanwhile,a comparative analysis of load-bearing ratio is made. It is concluded that themutability of normal stress is an effective way to study the soil ...