To study the catastrophic process of the inrush of water and mud in a fault fracture zone tunnel

a 3-D geologic model test system is established. Based on the water and mud inrush catastrophe of the F2 fault zone in the Yonglian tunnel in Jiangxi Province

a new similar material of fault and surrounding rock is developed by examining a large number of different material ratios and the physical and mechanical parameters of the materials. The temporal effects of displacement

seepage pressure

stress-strain and mass of gushed particles around the tunnel are analyzed. The seepage pressure increases with time

and the smaller the distance between excavation face and monitoring interface

the greater the fluctuation range. Before the inrush of water and mud

the mass of gushed particles decreases temporarily and then increases rapidly. The displacement of surrounding rock vault is mainly in vertical direction

and the displacement of hance is mainly in horizontal direction. At the same stress state

the strain of hance is larger than that of the vault. Comparative analysis is made between the catastrophe characteristics of test and the process of field catastrophe evolution

showing consistent results.