Faculty Profiles - NISHIYAMA Satoshi

&nbsp;In order to evaluate runoff control proper ties of three types of permeable pavements, namely, porous asphalt pavement, permeable interlocking concrete pavement and water-holding interlocking concrete pavement, experimentally obtaining permeability and water retentivity of each pavement material, this study conducted rainfall-runoff simulation of the three pavements using UNSA-2D, an numerical analysis program of saturated-unsaturated seepage flow. The input parameters of the numerical simulation were determined by fitting van Genuchten (VG) model or Irmay model into the experimental results. The simulation was performed under constant rainfall condition of three rainfall intensities and varying rainfall condition of center-peaked pattern. The results of numerical simulation revealed runoff characteristics of the three pavements, such as the temporal change in storage and infiltration with time, the runoff beginning time depending on the rainfall intensity and so on.

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STUDY ON DISPERSION OF LONGITUDINAL ELASTIC WAVES IN ROCK SPECIMENS

NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, TAKAHASHI Manabu, YOSHIMURA Kimitaka, ANDO Ken-ichi

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 67 ( 2 ) 288 - 298 2011

Publisher：Japan Society of Civil Engineers

&nbsp;In order to estimate the permeable properties and pore fluid properties in the ground, survey methods using dispersion and attenuation of elastic waves have been developed. The Biot theory have been applied to the frequency-dependent dispersion data, but the influence of geological properties on velocity dispersion and the relation between the permeable properties and velocity dispersion in rock specimens have not become clear. Sedimentary rock and granite specimens were tested using longitudinal waves for the difference of velocity dispersion phenomena observed in each specimen, and we examine whether the Biot theory can be applied to observed experimental data. Moreover, we tried to estimate the permeability of the rock specimen based on the theory and show that the Biot-squirt theory can be applied to estimating rock permeability using the seismic wave dispersion characteristics.

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SATURATED - UNSATURATED HYDRAULIC PROPERTIES OF SUBBASE COURSE MATERIAL AND SUBGRADE SOIL

YANO Takao, NISHIYAMA Satoshi, NAKASHIMA Shin-ichiro, MORIISHI Kazushi, OHNISHI Yuzo

Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 67 ( 2 ) 120 - 130 2011

Publisher：Japan Society of Civil Engineers

&nbsp;In order to evaluate the rainwate r storage and infiltration properties of the permeable pavement by unsaturated seepage analysis or gas-liquid two-phase flow analysis, it is important to know the unsaturated hydraulic properties of materials wh ich constitute the pavement. For this reason, we showed the unsaturated hydraulic properties of porous asphalt material s but we have not clarified the relation between the performance of the permeable pavement and the properties of all constituti on materials. In this paper, we try to determine the unsaturated hydraulic properties of subbase course and subgrade materials that greatly affect the rainwater storage and infiltration properties of the permeable pavement. We show from experiments that water retention characteristic and the un saturated hydraulic properties of subbase course and subgrade materials well match the van Genuchten model and the Irmay model.

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物理探査(2.調査・分類,総括,<特集>第46回地盤工学研究発表会)

西山哲

地盤工学会誌 59 ( 12 ) 2011

Study on a measurement method of slope displacement using a radio unit

NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, SATO Masaru, YOSHIZAKI Wataru

Japanese Geotechnical Journal 6 ( 4 ) 503 - 511 2011

Language：Japanese Publisher：The Japanese Geotechnical Society

This paper describes the method that measures displacements from the three dimensional coordinate of the radio wave transmitter attached on the slope by the phase differences of received signals that were received by the receivers in the slope surroundings. Concretely, the special low power radio wave emitted by the transmitter on the slope was received by four or more receivers, and then the transmitter coordinates were calculated by an intersection of iso-phase-difference surfaces of each received signal. In the study, we consider the calculation method of the transmitters&rsquo; coordinate values and prove by the experiments that we can in real time measure the slope displacement with a high degree of accuracy by using devices with the radio wave of the frequency of 2.4GHz. We show that we can estimate the precision using GDOP that is determined by geometrical arrangement of the transmitters and receivers and verify the applicability of the proposed method in a real slope.

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不連続変形法による降雨に起因する斜面崩壊の予測解析

入江敬, 小山倫史, 酒井直樹, 西山哲, 安田祐樹, 大西有三

岩盤力学に関するシンポジウム講演集(CD-ROM) 40th 2011

Flood control properties of permeable pavement

Journal of the Society of Materials Science,Japan 59 ( 7 ) 560 - 566 2010.7

29. A Study on the Monitoring Method of Rock Slope Movement, Using Narrow-band Wireless Communication System

Hagiwara Ikuo, Nishiyama Satoshi, Shimauchi Tetsuya, Yamamoto Tsuyoshi

21 57 - 58 2009

29. A Study on the Monitoring Method of Rock Slope Movement, Using Narrow-band Wireless Communication System

Hagiwara Ikuo, Nishiyama Satoshi, Shimauchi Tetsuya, Yamamoto Tsuyoshi

研究発表会講演論文集 21 57 - 58 2009

RESEARCH REGARDING THE TEMPERATURE REDUCTION EFFECT BY PERMEABLE PAVEMENTS/WATER RETENTIVE PAVEMENTS

AOKI Kazuo, TANAKA Toshiya, NISHIYAMA Satoshi, YANO Takao

29 92 - 94 2008.10

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