中国地方沖積地盤事情

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This paper describe the outlines of alluvium in Chugoku region. (1) The geotechnical maps, published in this region are shown in Table 1 and Fig. 2. (2) The geological specification and stratigraphy of quarternary are shown in Table 2. (3) The ground types of alluvium and area for type B and Type C are shown in Table 3 and Fig. 2. (4) The properties of quarternary layers are as follows. US. Fine or medium saturated sand. N=10〜15. Grain shapes are shown in Fig. 4. UC. Normal consolidated clay. N=0〜5. qu≒0.6p_o. C_c is shown in Fig. 5. C_v=1〜5×10^<-3> cm^2/sec (for clay), 5〜10×10^<-3> cm^2/sec (for silt). LS. Sand layer. N=15〜25. LC. Over consolidated clay. N=5〜10. L. Valcanic ash soil. N=1〜5. Lm. Sand and qravel, contain hard clay layers. N≧50. (5) The type of microtremors and relation between that of the ground type are shown in Table 4 and Table 5. (6.1) The liquefaction of alluvial sand layer is occurred in TOTTORI City 1943 (TOTTORI earthquake M=7.4, α_<max>≒250^<gal>) (6.2) The ground settlement of alluvium is occurred in TOTTORI City (settlement velocity about 1〜3 cm/year for ground type B and C). The damage of buildings are shown in Table 6. (6.3) Many slope failures by heavy rains are occurred in HIROSHIMA Pref. (1967), and SIMANE Pref. (1983). The type of failures are shown in Table 7. (7) The damage ratio of wood buildings in TOTTORI City by TOTTORI earthquake 1943, are shown in Fig. 7. Mainly damages are occurred in area of ground type B. (see Fig. 6) (8) Mainly, the bearing pile foundations are used to heavy buildings on alluvium, (see Table 8)
福山大学の論文

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芳賀保夫
福山大学工学部建築学科

中国地方沖積地盤事情

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