Analysis on Surrounding Rock Stress in Shallow-Buried Bias Tunnel

The numerical simulation of construction sequence was studied for shallow embedded bias tunnels using the method of CRD.The change of surrounding rock stress in excavating was analyzed and compared with field monitor result.The results show that the stress field is asymmetric.The change of stress in deep side is greater than it in low side.Steel string sensor can record the changing of stress in surround rock.