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Volume 39 (1998 - 199･･･
- Issue 6 Pages 486-
- Issue 5 Pages 414-
- Issue 4 Pages 346-
- Issue 3 Pages 244-
- Issue 2 Pages 174-
- Issue 1 Pages 4-
Volume 39, Issue 2
Displaying 1-7 of 7 articles from this issue
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Takeshi KAMEI, Masao ENOMOTO1998 Volume 39 Issue 2 Pages 174-182
Published: June 10, 1998
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe flat dilatometer in-situ testing device (DMT) has gained considerable acceptance in North America and Europe. DMT provides an extremely rapid, reliable, and economic means of determining stratigraphy, strength, deformation modulus, and overconsolidation ratio from one sounding. The main advantages of DMT are its simplicity, rugged, range of flexibility for soil types, many useful correlations, high reproducibility, and rapid use in geotechnical engineering practice. Simple expressions developed from DMT are used to determine the three key parameters ID (material index), ED (dilatometer modulus), KD (horizontal stress index) from the field readings. Profiles of ID, ED, KD, are used with empirical correlations in the DMT method to obtain a number of soil parameters used in geotechnical engineering design.
This paper presents a basic introduction to the use of the flat dilatometer, and describes one application in the field. Results from DMT give reasonably accurate predictions of soil classification, undrained shear strength, modulus of deformation, and overconsolidation ratio. It is concluded, therefore, that DMT has an important role to play as a profiling tool. Finally, DMT is easy to use, is cost effectiveness, and is . . a, versatile in-situ test which gives results comparable to other tests.View full abstractDownload PDF (1939K) -
Takeshi KAMEI, Saiichi SAKAJO1998 Volume 39 Issue 2 Pages 183-192
Published: June 10, 1998
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSA simplified method for evaluating the undrained shear behavior of Ko-consolidated cohesive soils has previously been proposed. This method combined derived soil parameters proposed by KAMEI, and the elasto-viscoplastic model proposed by SEKIGUCHI and OHTA. For several strain-controlled undrained triaxial tests of Ko-consolidated cohesive soils, reasonable agreements have already been obtained between observed and computed results.
To confirm the applicability of the proposed method for practical problems in geotechnical engineering, simplified deformation analysis with idealized assumptions for deep clay foundation under embankment has been carried out. The model simulations are compared with the well-documented case history of the Kanda trial embankment. Reasonable agreement is obtained between measured and computed values for settlement and excess pore pressure with elapsed time. The principles of the proposed method are useful for evaluating deformation characteristics for foundation under embankment. Future refinements will be possible with the acquisition of additional data.View full abstractDownload PDF (1968K) -
Shuichiro YOKOTA, Akira IWAMATSU1998 Volume 39 Issue 2 Pages 193-201
Published: June 10, 1998
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe Ryugamizu cliff facing the Kagoshima Bay is well known as an hazardous area for slope failures in Japan. Slope failures and debris flows have frequently occurred on the cliff during every rainy seasons. The Quaternary volcanic rocks, pyroclastic rocks and sedimentary rocks composing the cliff form a complicated distribution and structures. Based on drilling log data of 200 meters depth on the plateau, the rock mass composing the cliff can be understood as a combination of permeable volcanic rocks with systematic joints and poor permeable siltstone intercalated by them. All strata dip gradually southwestern direction with plunging structure against the cliff. Lateral changes of thickness and lithofacies are especially remarkable in poor permeable strata.
Based on these geological structures, most of rainwater fellen on the plateau may flow southwestward. However, if the rain is heavy, uplift of groundwater table due to rain water may bring about gush of water from the cliff which is one of triggering causes for the occurrence of slope failures and debris flows.View full abstractDownload PDF (2172K) -
Satoru KAWASAKI, Kazuhiro KOIZUMI1998 Volume 39 Issue 2 Pages 202-207
Published: June 10, 1998
Released on J-STAGE: February 23, 2010
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Kazuo KOSAKA1998 Volume 39 Issue 2 Pages 208-216
Published: June 10, 1998
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSMagnetic susceptibility is one of the basic physical properties of rocks and sediments, and is easily measured in room and in the field. Magnetic susceptibility is, therefore, used for a variety of survey of engineering geology: recognition of rocks and their origins based on difference in the value of magnetic susceptibility, mining and searching ore minerals, rapid recognition of the general features of boring-core samples, estimation of physical properties of rock masses, evaluation of landslide deposits, estimation of denudation rates of mountain areas, recognition of tephras which are not recognizable by naked eyes, characterization of river sediments, applications for environmental geology, and applications for archaeological and criminal investigations.View full abstractDownload PDF (2696K) -
Manabu TAKAHASHI, Xiaochun LI, Ming ZHANG1998 Volume 39 Issue 2 Pages 217-220
Published: June 10, 1998
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (491K) -
Yasuo NAKAMURA1998 Volume 39 Issue 2 Pages 221-229
Published: June 10, 1998
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (2116K)
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