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SURFACE SUBSIDENCE ABOVE SHALLOW SANDY GROUND TUNNEL

1986; Volume: 1986; Issue: 370 Linguagem: Inglês

10.2208/jscej.1986.370_85

1882-7187

Toshihisa Adachi, Takeshi Tamura, Atsushi Yashima, Hiroshi Ueno,

Geotechnical Engineering and Soil Stabilization

Surface subsidence due to a shallow sandy ground tunnel construction may affect the stability and safety of neighboring structures. To establish a design method for shallow sandy ground tunnels, it is very important to specify an analytical model which can synthetically explain not only the surface subsidence but displacement behavior in the surrounding ground as well. For the purpose, a series of finite elements analyses, i. e., elastic elements analysis, elasto-plastic elements analysis, no-tension analysis, and joint elements analysis, were carried out and their analytical results were discussed in relation to the following four points, those are (1) deflections of tunnel wall, (2) extent of plastic zones developed in surrounding ground, (3) the shape of surface subsidence, and (4) the ratio of the displacement at the tunnel crown to the amount of surface subsidence. The use of joint elements was found to be the most effective in the analysis of a shallow sandy ground tunnel construction.