...FACTORS INFLUENCING THE LOOSENING ZONE AND CALCULATION METHOD FOR SUPPORT PRESSURES OF SHALLOW TUNNELS IN LAYERED ROCK STRATA *Zhiwei Wang and Chunsheng Qiao School of Civil Engineering, Beijing Jiaotong University 3 Shangyuancun, Xizhimenwai, Haidian district Beijing, China (*Corresponding author...

... shallow tunnels located in a body of brittle rock mass. Preliminary studies have clearly indicated that, the rock mass behaviour was largely dictated by the different yield mechanisms involved. These mechanisms appear to be multifarious due to the complex state of the induced stresses around the tunnel...

.... Details of the construction methodology are given in Grasso et al. 1995. The heading and benching excavation was performed using the drill-and-blast technique during the day shift and hydraulic hammer during the night shift. production control tension crack shallow tunnel stability production...

... weitgehend wasserdichte Konstruktion herzustellen, entgegen. wurden Abb durchgefUhrt shallow tunnel deutscher ausschub fur stahlbeton werden schubspannungen der arbeitsfuge Bochum mebquerschnitt eingerichtet realistic design schultz und partner temperaturen im gebirge daschner...

... SYNOPSIS: The paper proposes a simple approach to the problem of roof stability of shallow tunnels which is based upon the nature of frequently observed failures. Using the principal stress trajectories and the failure criteria respectively for the rock mass and discontinuities, the ground...

... SYNOPSIS: In the article a method developed by the author is applied to the problem of the evaluation of critical geometry- and material-parameters of shallow tunnels. The limit load problem of the shallow tunnel is formulated as a linear eigenvalue problem. As the author has shown previously...

... SUMMARY: In this paper, first, the method of a complex variable taking time dependency and anisotropy of the ground into consideration is newly proposed to estimate surface displacements caused by shallow tunnel driving in soft ground subject to gravity. Secondly, theoretically calculated...

...BEHAVIOR OF SHALLOW TUNNELS IN WEATHERED AND SOUND METAMORPHIC ROCKS Comportement des tunnels peu pretends dans des massifs alteres et sains Verhalten seichter Tunnels in verwittertem und in gesundem Fels C.M. NIEBLE MsC,Consultant Engineer R.J. - Brazil J. TAKAHASHI Engineer, Figueiredo Ferraz...