Block-TBM interaction in discontinuous rock masses

摘要

With the application of TBM in the construction of tunnels,increasing simulations are taken on TBM tunnels.This paper proposes the concept of utilizing block theory to simulate block-TBM interaction in discontinuous rock masses and predicate the stability of surrounding rock blocks in TBM tunnels for the first time.Besides,the basic theory of the simulation on TBM tunnels with the block theory will be established through three parts: simplification of thrust and torque from the cutter head,block classification of TBM tunnels and simulation on the excavation progress.Furthermore,an object-oriented computer model was constructed for TBM tunneling in three-dimensional multi-block systems based on the object-oriented programming(OOP)technique.The intricate structures of machine-rock rock stability interaction are deciphered by implementing object-oriented analysis(OOA),and a universal class library is developed through objectoriented design(OOD).The computer model can be created by cutting a computational domain into machineelement-blocks and then combining them into machine-complex-blocks(convex or concave).The established computer model would be highly available for TBM tunneling in discontinuous rock masses.A computer program BLKLAB is developed based on the proposed method and a case study is done on a large-scale rock tunnel.