Abstract Based on the long and deep Erlang Mountain tunnel , 3DEC software was used to build a numerical mod?
el with different dip angles, inclinations and thicknesses of the bedded surrounding rock, and the principal stress of each position at the tunnel periphery was calculated so as to judge the rockburst position during tunnel construction.The results show that: 1) when the dip angle of the surrounding rock is 0° or the inclination of the stratified rock is the same as the tunnelling direction, the principle stress at the vault crown position is the largest; 2) when the rock dip angle is 90°, the two side walls are prone to rockburst; 3) when the rock inclination is opposite to that of the tunnel excavation, the principal stress at the upper part of the working face is the largest, where it is prone to rockburst;
and 4) the thickness of the bedded rock does not affect the position of the maximum principal stress.
Abstract：
Based on the long and deep Erlang Mountain tunnel , 3DEC software was used to build a numerical mod?
el with different dip angles, inclinations and thicknesses of the bedded surrounding rock, and the principal stress of each position at the tunnel periphery was calculated so as to judge the rockburst position during tunnel construction.The results show that: 1) when the dip angle of the surrounding rock is 0° or the inclination of the stratified rock is the same as the tunnelling direction, the principle stress at the vault crown position is the largest; 2) when the rock dip angle is 90°, the two side walls are prone to rockburst; 3) when the rock inclination is opposite to that of the tunnel excavation, the principal stress at the upper part of the working face is the largest, where it is prone to rockburst;
and 4) the thickness of the bedded rock does not affect the position of the maximum principal stress.
2017, Vol. 54 