Faculty Profiles - KOMATSU Mitsuru

Other Link： https://jlc.jst.go.jp/DN/JALC/00321631778?from=CiNii

液状化防止を目的とした地盤の不飽和化に関する実験的研究 Reviewed

坂本篤, 鈴木正人, 西垣誠, 小松満, 今井淳, 佐藤泰, 横田季彦

廃棄物学会論文誌 19 ( 5 ) 318 - 327 2008.9

不飽和地盤の調査事例

小松満, 西村拓, 竹下祐二

地盤工学会誌 = / the Japanese Geotechnical Society 56 ( 7 ) 77 - 83 2008.7

キャピラリーバリアによる廃棄物処分場の浸出水の制御に関する研究 Reviewed

西垣誠, 小松満, 藤井直, 大内正敏

土木学会論文集C 64 ( 2 ) 340 - 352 2008.6

不飽和地盤の調査と浸透特性値の計測

竹下祐二, 小松満

地盤工学会誌 = / the Japanese Geotechnical Society 56 ( 6 ) 62 - 69 2008.6

Value of borehole data on geologic model construction for improving model calibration accuracy Reviewed

Sakaki, T, C. C. Frippiat, T. H. Illangasekare, M. Komatsu

Proceedings of the MODFLOW and More 2008, May 19-21 439 - 443 2008.5

亀裂性岩盤におけるグラウトの注入範囲と有効間隙率の評価

西垣誠, 見掛信一郎, 小松満, Kwabena KANKAM-YEBOAH

土木学会論文集 No.743 ( III-64 ) 199 - 212 2008

A Fundamental Study on Prediction of Slope Failure Induced a Heavy Rain Reviewed

NISHIGAKI Makoto, KOMATSU Mitsuru, RYUMAN Kousei

55 ( 6 ) 24 - 26 2007.6

Language：Japanese Publishing type：Research paper (scientific journal)

In the south area in Cyugoku region, residual granite soil is distributed widely and it induced many slope failures at heavy rain. In this study, it showed the each process that reached model of slope failure, and for the establishing the system which could grasp a change of the slope stability that it monitored in the real slope. This method is technique to assume the arrival time of wetting front to base impermeable layer or water table with monitoring of water content changing. Furthermore, it performed numerical seepage analysis and examined consistency with monitoring data. It is understood that effective of the water content measurement as long-term method, but, for completion of a prediction system, some problem remained in measurement results and analysis precisions.

Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10445158

Laboratory rainfall-induced slope failure with moisture content measurement Reviewed

Adrin Tohari, Makoto Nishigaki, Mitsuru Komatsu

JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING 133 ( 5 ) 575 - 587 2007.5

Language：English Publishing type：Research paper (scientific journal) Publisher：ASCE-AMER SOC CIVIL ENGINEERS

The development of a physically based warning system for rainfall-induced slope failures requires a comprehensive understanding of the failure process. A set of laboratory-scale soil slopes was subjected to instability, through three different modes of raising water level, to clarify the process of failure initiation. Hydrologic responses of the model slopes to the saturation process were recorded by volumetric soil moisture content sensors. The results of model tests show that failures of the model slopes were essentially initiated by the development of an unstable area near the slope toe, upon the formation of the seepage area, with shallow noncircular sliding being the dominant failure mode. The volumetric moisture content of the slope region where localized failures initiated was noted to reach a nearly saturated value. However, the major portion of soil slopes involved in overall instability was still in an unsaturated condition. Based oil the observed moisture content response of the model slopes, a concept for prediction methodology of rainfall-induced slope failures is introduced.

DOI： 10.1061/(ASCE)1090-0241(2007)133:5(575)

Web of Science

IN-SITU METHOD FOR MEASURING HYDRAULIC CONDUCTIVITY OF THE BENTONITE MIXTURED SOIL LINER Reviewed

NISHIGAKI Makoto, KOMATSU Mitsuru

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 63 ( 1 ) 299 - 311 2007.3

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

The purpose of this study is proposing for the test method for measuring the hydraulic conductivity of bentonite mixtured soil used as a seal liner of waste disposal site after the construction in situ. Concretely, it is a method for building in the moisture sensor in which the measurement in the pinpoint was possible for Air Entry Permeameter, which exists in situ permeability test method. In results of this study, by catching fall time of wetting front, 10^-8(m/s) order of hydraulic conductivity could be measured in about 10 minutes. And, the validity of this proposed method was verified by carrying out the one-dimensional infiltrating test, and measuring moisture profile and pressure distribution in the test-piece.

DOI： 10.2208/jscejc.63.299

EVALUATION ON APPLICATION OF BENTONITE SLURRY GROUT FOR EXCAVATION DISTURBED ZONE IN ORDER TO RECOVER LOW PERMEABLE ROCK MASSES

Proposed geophysical method for investigating the seabed for a landfill project in Okayama, Japan Reviewed

Nishigaki,M, M.Komatsu, M.Inoue, K.Kankam-Yeboah, S.Mattersteig, J.A.Akudago

Environmental Geotechnics(5th ICEG), H.R.Thomas(eds) 1495 - 1502 2006.6

NISHIGAKI Makoto, KOMATSU Mitsuru, MIKAKE Shin-ichiro, NAKASHIMA Tomohiro, KANAYA Kensei, TATSUTA Keisuke

Doboku Gakkai Ronbunshu ( 806 ) 55 - 66 2005.12

Language：Japanese Publisher：Japan Society of Civil Engineers

The purpose of this paper is to improve technologies of the grouting for excavation disturbed zone in order to recover low permeable rock masses for research and development on geological disposal of high-level radioactive waste. In this study, experiments of grouting injection test are performed on bentonite slurry mixes with saline and ethanol in the laboratory. From the results of the tests, low viscous and high density bentonite slurry is found to be able to inject the concentrated bentonite slurry and to recover low permeable in the fine fractured aperture. In conclusion this bentonite slurry is able to be expected the grouting effects for excavation disturbed zone in order to recover low permeable rock masses.

DOI： 10.2208/jscej.2005.806_55

Some aspects of groundwater drawdown and seepage flow rate in tunnels Reviewed

Nishigaki,N, M. Komatsu, A. Irie

Construction and Operation of Long Tunnels , To Celebrate the Breakthrough of the 12.9Km Hsuehshan Tunnel 1 259 - 271 2005.11

A NEW METHOD FOR PREDICTING GROUND SETTLEMENT USING GROUNDWATER FLOW ANALYSIS Reviewed

NISHIGAKI Makoto, IMAI Toshikazu, KOMATSU Mitsuru, NAGAI Izumi

Doboku Gakkai Ronbunshu ( 799 ) 1 - 12 2005.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

To estimate the degree of consolidation settlement, the soil mass conservation principle was used in this analysis. The specific storage coefficient was treated as a function of effective stress and void ratio. With this method, the behavior of consolidation from over-consolidation state to normal-consolidation state is easy to analyze. To evaluate its validity, results from the new method were compared with those from laboratory tests and Terzaghi's one-dimensional analysis. From these comparisons, it was shown that the principle is very accurate and reliable for estimating ground settlement. The new method was also used to analyse field conditions and to estimate settlement arising from (a) dewatering (pumping), (b) double-step load landfill phenomenon and (c) the disruption of groundwater flow during underground construction.

DOI： 10.2208/jscej.2005.799_1