藤沢市大庭地区の表層地質 : ローム層の区分とN-値および固結化との関係

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A study on the relation between stratigraphical succession of Kwanto"loam"(volcanic ash beds )and its hardness, especially consolidated dark blue part of the volcanic ash, are made at Oba district, western part of Fujisawa city. The Kwanto"loam"are divided into Shimosueyoshi loam and Younger loams (Musashino loam and Tachikawa loam are put together in this paper), and the following five terraces are distinguished in the area studied ; namely, Koza, Golf-jo, Matano and Hikiji-gawa terraces. Many pumice or scoria seams, which are of for strtigraphic correlation of Kwanto"loam"at each outcrops and bore-holes, are summarized throughout the area among them, Tokyo pumice, Miura pumice, An-shin pumice, Fujisawa pumice, etc. are remarkable. Results of standard penetration test (N-value diagram) are compeared with the bore-hole stratigraphical succession at each boring sites, by observation of core-samples with naked eyes. As results, the following are concluded; 1) From the results of standard penetration test, the Kwanto"loam"is subdivided into four groups: Group I: N≒3〜4 Group II: N≒7〜8 Group III: N≒11〜16 Group IV: N≒20 or more Among the groups, III and IV are consolidated volcanic ash under visual observation, which is dark bluish in color. 2) Distinct difference of N-value are found between Shimosueyoshi loam and Younger loams. Shimosueyoshi loam is more solidified throughout all bore-hole successions. 3) Younger loams, covering the higher terrace, is more solidified than that of the lower terrace. 4) Consolidated dark blue part of Kwanto"loam"are, in most cases, found upwards or around the pumice seams. On the contrary, pumice or scoria seams are less solidified than the surrounding volcanic ash and ground water which are contained or permiate into the pore space of the loam beds.
一般社団法人日本応用地質学会の論文
1970-12-01

藤沢市大庭地区の表層地質 : ローム層の区分とN-値および固結化との関係

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