Analysis of Factors that affect and controls the Excavation Disturbance/Deformation Zone in crystalline rock
A tunnel in crystalline rock at 450 m depth in (A)sp(o) Hard Rock Laboratory, designed with an oval shape and aligned almost perpendicular to the maximum horizontal in-situ stress, was selected to investigate the extent of the Excavation Damage Zone (EDZ). Extensive information for understanding EDZ such as blast design, convergence measurements, ultra sonic measurements in several boreholes, geological mapping of tunnel and cores, 3D-laser scanning of the tunnel geometry exist in the vicinity or in section 47 of the tunnel. The mapped geological features and the tunnel geometry obtained from laserscanning were used to build a 3D model of the geology. This geological model was implemented in a numerical model to evaluate the rock mechanic response during the excavation. The modeling capability of the mechanical processes of importance for the EDZ was then tested against the measured data. From the numerical model, it was concluded that larger fractures and the uneven as-built geometry generate heterogeneous stress redistribution at different tunnel sections. This could induce local fracturing and asymmetry in the EDZ, which shows that the extent of the EDZ in a blasted tunnel is strongly dependent on local irregularities in the tunnel wall.
A.B(a)ckstr(o)m M.Jonsson R.Chistiansson D.Mas-Ivars
(A)F - Rock Engineering & Measurement Technology, Solna, Sweden Swedish Nuclear Fuel and Waste Management Co, Stockholm, Sweden Itasca Geomekanik AB, Stockholm, Sweden
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）