Two groups centrifuge tests of pit foundation supporting with scattered row piles are carried out by Tongji University. Combined with three-dimensional finite element numerical simulation

the suitability that the specification method is used to calculate the internal forces and displacement of pit supporting structure with scattered row piles is explored. In addition

a theoretical calculation method of earth pressure of pile considering soil arching effect is proposed. Finally

the calculation model of internal forces and displacement of scattered row piles considering soil arching effect is created. The results show that

for pit supporting structure with scattered row piles when the ratios of pile spacing and pile diameter are 2

3 and 8

the soil between piles can’t form soil arching effect. In addition

when the ratios are 4-7

the soil arching effect between piles is obvious. The results of pile internal forces and displacement by specification method are larger than the result by centrifuge test. Furthermore

the pile internal forces and displacement of pit supporting structure with scattered row piles calculated by the proposed calculation method are more reasonable.