土木学会論文集
Online ISSN : 1882-7187
Print ISSN : 0289-7806
被りの浅い砂質地山トンネル掘削に伴う地表面沈下
足立 紀尚田村 武八嶋 厚上野 洋
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1986 巻 (1986) 370 号 p. 85-94

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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.

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