宮川用水上御糸線第2号トンネルの地質について
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概要
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This is a report of geological and soil mechanical researchs for Kamimiito No.2 Tunnel that is under construction. The tunnel exists at Akechi Town of Mie Prefecture, Japan. The tunnel length is 115m and dig section is 1.6m×1.8m. On the geological view of the site, the tunnel lies a valley between two hills that consist of the heavy weathered granite like soil (so called, Masa soil) The materials of the inlet and the exit portions are alluvial deposits that consist of mica bearing silt and fine sand layers. The mica rich soils was supplied almost from the hills. [see, Fig. 1] On account of the layers run with ground water under the excavation, the construction mets with the difficult problem. Against the problem, nine core boring was digged for the researchs of geological conditions along the tunnel route, and also the standard penetration test was done in the each boreholes.[see, Fig. 2,3] At the No.5 borehole, grain size analysed on the core at the depth of 3.0m〜3.5m,5.0m〜5.5m and 10.0m〜10.5m.[see,Fig.4] As to the permeability tests in the borehole No.5 and No.9, the coefficients of permeability K are 5.3×10^<-6>cm/sec and 3.7×10^<-4>cm/sec. And also, the relation of the rainfalls and the ground water levels was measured from June to August. [see,Fig.6] According to the results of the researchs, the considerations for the drainage and the ground improvement works was done one the various construction methods, i.e. Open cut, Well point, Sand pile, Chemical liquid injection and Freezing method. But, none of the methods fit for the ground conditions or for the economical works. The problem came to the conclusion that the route must took a detour.
- 一般社団法人日本応用地質学会の論文
- 1970-04-01