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STUDY OF GROUND BEHAVIOR DURING EXCAVATION OF THIN OVERBURDEN TUNNEL IN UNCONSOLIDATED GROUND

1984; Volume: 1984; Issue: 352 Linguagem: Inglês

10.2208/jscej.1984.352_79

1882-7187

Akira YOKOYAMA, Akio Akio Takase,

Grouting, Rheology, and Soil Mechanics

This paper discusses the ground behavior during excavation of thin overburden tunnel in unconsolidated ground with the results of field measurements and numerical analysis.Horinouchi and Tokko tunnel on the Narita Shinkansen Line provide the data for this paper. These tunnels were constructed in the diluvial sedimentary soil layer of very poor quality at the depth of 4-11m from the ground surface.In this study, the mechanism of ground settlement, the condition of ground arch formation and the estimation of the amount of settlement of surface at each stage of excavation were obtained with looking upon the sorrounding ground as macroscopic elastic body.This paper will be the usefull guide for designing and monitoring the similar tunnels.