In order to investigate the interaction problems between the underground structure and the rich water porous rock

a kind of material similar to the porous medium solid-liquid coupling material was developed according to similarity theory of modeling simulation. The material was mixed and pressed from coarse sand

cement

pervious concrete intensifier and water by certain ratio. Proportioning experiments were carried out based on the orthogonal experiment design principle. Then small model samples were produced to obtain parameters such as the uniaxial compressive strength

the permeability coefficient

the bulk density and the elastic modulus and Poisson's ratio. The effects of different ingredients were studied; so the proportions of ingredient were varied for the different needs in physical simulations. The mechanical behaviours of these materials are stable

and not only meet the requirements of large models

but also suitable for large physical experiment on structure and wall rock destruction. Therefore

the simulation experiment material is feasible for risk assessment of underground structure in rich water conditions