NEAR-FIELD DYNAMICS METHOD AND SYSTEM FOR SIMULATING SUDDEN INRUSH WATER DISASTER OF TUNNEL ROCK MASS FAILURE

摘要

Disclosed are a near-field dynamics method and system for simulating a sudden inrush water disaster of tunnel rock mass failure, which solve the problems of existing methods in which describing progressive failure features of rock mass under the action of excavation and unloading is difficult and an evolution mechanism of an inrush water channel cannot be revealed, and can effectively describe the formation process of the rock mass failure inrush water channel and a surrounding rock damage and failure mechanism. The technical solution is: discretizing a computing model as matter points, and configuring a virtual boundary layer on an outer side of a boundary of the computing model as an object implemented by a boundary condition; selecting a neighborhood size of the matter points to form a neighborhood matrix of the matter points; enabling the crustal stress to be equivalent to a stress boundary condition of the computing model and karst water pressure to be equivalent to normal pressure, and converting a displacement constraint and a tunnel support into a displacement boundary condition; solving the velocity and displacement of the matter points, determining whether the bonds of all of the matter points satisfy a failure condition, and recording the local damage condition; and after an initial equilibrium calculation is stabilized, using a material point dormancy method to simulate a tunnel construction process.