Validation of 3D DDA method and its application to the control of rock collapse in tunnels
In order to accurately simulate the evolution process of tunnel surrounding rock collapse disaster and bolt supporting,the bolt support simulation in the three-dimensional discontinuous deformation analysis method(3D DDA)was achieved by embedding the bolt support algorithm.Firstly,the basic principle of simulating block motion using the 3D DDA method was introduced,and the bolt support algorithm in the 3D DDA meth-od was proposed.Secondly,in response to different motion modes in tunnel surrounding rock collapse disas-ters,the 3D DDA method was used to simulate the process of block sliding,rotation,and collision,and the accuracy of the 3D DDA method in simulating block movement was verified.Finally,the 3D DDA method was used to simulate the collapse process of jointed rock mass tunnel surrounding rock at an engineering scale.The results show that under unsupported conditions,the collapse height of the surrounding blocks in the tunnel is 3.9 m,and the displacement of the surrounding blocks shows obvious anisotropic characteristics.Under the condition of bolt support,the blocks of the tunnel remain stable,and the axial force of the bolt in the left arch shoulder of the tunnel is relatively large,which means the length of bolts in this area can be increased in actual construction.
three-dimensional discontinuous deformation analysis method(3D DDA)surrounding rock col-lapsestability analysisbolt support
万方数据
维普
