A simulation explosion test is an important method to study the dynamic property of foundation

the soil-structure impactive interaction due to exploding

and the anti-explosion ability and destroyable mechanism of underground safeguard engineering structure under impactive load due to exploding. The design of scale model similitude is one of keys to insure that simulation explosion test can really reflect the dynamic characters of prototype under impactive load due to exploding.To aim at the safeguard effect of superstratum of saturated sand to defence tunnel of circular arch and vertical wall which isn’t destroyed by impactive terra wave as a result of the explosion of bomb falling to the ground

this dissertation will base on the theorem of Bockinghamπwidely applied at present

and a method mainly used is the dimensional analysis method

also the comparabilities of the nonlinear dynamic response of soil-structure system to impactive process of exploding

the dynamic response of soil-structure interface to impactive process of exploding

and the dynamic interaction of exploding impactive terra wave and structure are considered

in order to solve the similitude relation of model design of simulation explosion test of soil-structure impactive interaction due to exploding.