According to similarity principle of geomechanical model test

a new type cementitious geotechnical similar material called iron crystal sand is developed through a lot of material mechanics test. This similar material is evenly mixed with iron ore powder

blanc fix

quartz sand

gypsum powder，rosin and alcohol in certain proportion and pressed together. Iron ore powder

blanc fix and quartz sand are main materials

the solution of rosin alcohol is cementing agent

gypsum powder is regulator. Specimen mechanical tests show that the new-type similar material has many remarkable advantages as follows: high volume-weight

wide variable mechanical parameters

stable performance

low price

easy dryness

easy processing and without any toxicity and side effects. It can be used to simulate most of rockmass material from soft to hard ones. The new typed material has been used in 3D geomecanicl model test of bifurcation tunnel of Sanghai-Chendu-Xichang expressway and mechanical deformation properties of rockmass surrounding bifurcation tunnel have been effectively revealed under excavation state.