JaLCDOI 10.18926/fest/11539
Title Alternative One-dimensional Compression Tests of Sludge Cake from Dredged Sludge
FullText URL 006_085_097.pdf
Author Wakitani, Yoshiaki| Fujii, Hiroaki| Nishimura, Shin-ichi| Inoue, Takashi|
Abstract One-dimensional compression tests were performed to investigate compression characteristics of sludge cake used as a construction material. The sludge cake is dewatering product of dredged sludge from the bottom of a lake. The test results show following compression characteristics. (1) For the undisturbed samples, e-log p curves show compressibility of overconsolidated clay ordinatily observed. (2) For the disturbed samples, there observed compressibility close to that of ordinary normally consolidated clay. (3) For the recompressed samples, there observed two turning points on e-log p curve. The compression presures(p(c1) and p(c2)) at those points for the unsubmerged tests have a linear correlation with the recompression pressure(p(s)). The submerged tests give very small values of p(c1) and p(c2) compared with the case of unsubmerged test. (4) For the recompressed samples, the first compression index(C(c1)) after p(c) has a linear correlation with the initial void ratio(e(0)), and the second compression index(C(c2)) shows almost constant value.
Keywords sludge cake one-dimensional compression test e~log p curve compression index void ratio
Publication Title 岡山大学環境理工学部研究報告
Published Date 2001-02-28
Volume volume6
Issue issue1
Start Page 85
End Page 97
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313853
JaLCDOI 10.18926/fest/11528
Title Alternative Damage factors analysis for small embankment dams due to the Hyogoken-Nambu earthquake special to Hokudan Town
FullText URL 007_055_074.pdf
Author Fujii, Hiroaki| Kunimasa, Kana| Nanba, Akiyo| Yokomizo, Takayuki| Nishimura, Shin-ichi| Shimada, Kiyoshi| Hori, Toshio| Nishiyama, Tatsuro| Wakitani, Yoshiaki|
Abstract This study was performed to clarify which factors affected damage to take-ike (small embankment dams for irrigation in Japanese) of Hokudan Town on Awaji Island in western Japan due to Hyogoken-Nambu earthquake. Multivariate and ordinary statistical analysis were carried out using documentary data (181 damaged and 328 undamaged dams), and ordinary one was done for the results investigated in situ. The model for the multivariate analysis was created with 13 items and 94 categories for 4 groups (Location, Geology Structure, and History of Dam). As a result, the factors causing to damage for dam are (1) the nearest fault (Nojima, Mizukoshi and D2), (2) embankment volume (the larger the more), (3) angle of crest axis to epicenter (diagonal and normal), (4) distance to the nearest fault (less than 500 m), (5) distance to the epicenter (8 to 14 km which almost agree to the location of seismic intensity 7 JMA), (6) play view of dam axis (3 or 4 axes), (7) angle of crest axis to nearest fault (diagonal and normal), (8) elevation of dam site (over 100 m), (9) surface geology of dam site (non-cohesive soil), (10) era of construction (prior to 1891), and (11) soil properties of embankment (constructed of sand, smaller penetration resistance).
Keywords Earth dam earthquake damage site investigation statistical analysis case study
Publication Title 岡山大学環境理工学部研究報告
Published Date 2002-03-22
Volume volume7
Issue issue1
Start Page 55
End Page 74
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002314039