Search Results 1-20 of 128

  • Defect detection for shotcrete in ceiling of underground cavity by noncontact acoustic inspection method : Alternative method of hammering inspection by acoustic irradiation induced vibration from a long distance  [in Japanese]

    杉本 恒美 , 杉本 和子 , 歌川 紀之 , 黒田 千歳 , 森岡 宏之 , 鶴田 滋 , 中川 貴之 , 本田 中 , 杉崎 直人 , 山崎 隆央

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報 119(430), 7-12, 2020-02-28

  • Development of shotcrete defect detection technology for the ceiling of a large underground cavity by noncontact acoustic inspection method  [in Japanese]

    杉本 恒美 , 杉本 和子 , 歌川 紀之 , 黒田 千歳 , 森岡 宏之 , 鶴田 滋 , 中川 貴之 , 本田 中 , 杉崎 直人 , 山崎 隆央

    検査技術 24(12), 6-16, 2019-12

  • INVESTIGATION OF VIBRATION PROPERTIES AT HAMMERING TEST OF TUNNEL LINING BASED ON NUMERICAL ANALYSIS  [in Japanese]

    TSUNO Kiwamu , SHIMAMOTO Keisuke

    <p> トンネル覆工の打音調査を対象に,変状の程度と振動特性の関係について検討を行った.まず,覆工を模擬した試験体を打撃する打音試験を行い,内部空洞がある場合に減衰に要する時間が長くなることや,固有振動に相当する周波数に明瞭なピークが見られる等の特性を把握した.また,三次元動的解析を行い,打音試験と対応していることを確認するとともに,内部空洞により振動スペクトルに明瞭なピークが見られる …

    Journal of Japan Society of Civil Engineers, Ser. F2 (Underground Space Research) 75(1), 26-38, 2019

    J-STAGE 

  • Conditions of the cavity formation and sinkholes in the practical ground

    Sato Mari , Uno Yoshinori , Ito Ryota

    … The underground cavities are expanded by soil drainages and finally it causes sinkholes. … Obvious collapse and cavity expansion hardly occurred because of the very low permeability. … It is suggested that two specific conditions are required to promote the cavity expansion; … one is the strong seepage close to the cavity, and which directly flow into there. …

    Japanese Geotechnical Society Special Publication 7(2), 493-500, 2019

    J-STAGE 

  • Recent studies on the mechanism of sinkholes and ground cave-ins  [in Japanese]

    KUWANO Reiko

    <p>地盤陥没は顕著な前兆がなく突然起こるようにみえ,対策を困難にしている.陥没は何らかの原因によって地中に空洞ができ成長して地表に達することで起こるもので,自然生成の空洞と都市インフラに起因する空洞に大別される.本報では,それらの特徴を整理すると共に,空洞生成・成長のメカニズム研究や陥没対策の技術開発の動向について報告する.</p>

    SEISAN KENKYU 71(4), 825-828, 2019

    J-STAGE 

  • Microwave Reflection Imaging Diagnosis Technology for Protecting Sinkhole Occurrence:– Use of SKELE-KA Technology to Crisis Management of Infrastructure –  [in Japanese]

    KONDO Taiki

    <p>近年,都市基盤の施設が老朽化することや過密した都市の地下空間の開発が原因となり,さらに大規模自然災害をきっかけに多くの道路陥没が発生している.広範囲における調査を迅速に実施し,道路が陥没に至る現象を予測・診断して道路陥没を防止することが求められている.この課題に対応するため,本稿ではマイクロ波反射波画像診断技術を活用して陥没の原因となる空洞を発見する「スケルカ技術」を紹介する.さ …

    SEISAN KENKYU 71(2), 153-157, 2019

    J-STAGE 

  • Monitoring and evaluation of simulated underground coal gasification in an ex-situ experimental artificial coal seam system

    SU Fa-qiang , HAMANAKA Akihiro , ITAKURA Ken-ichi , ZHANG Wenyan , DEGUCHI Gota , SATOH Kohki , TAKAHASHI Kazuhiro , KODAMA Jun-ichi

    … In this study, to better simulate underground coal gasification (UCG), an artificial coal seam was constructed to use as a simulated underground gasifier, which comprised coal blocks excavated from the coal seam. … In the present work, the fracturing activities and cavity growth inside the reactor were monitored with acoustic emission (AE) technologies. …

    Applied Energy (223), 82-92, 2018-08-01

    IR 

  • Installation of Mobile Integrated Soundproof Doors and Limestone Cavity Measures : The Takachiho Hinokage Road, the Ohirayama Tunnel  [in Japanese]

    佐土原 一也 , 永松 雄一 , 久下 敦

    トンネルと地下 = Tunnels and underground : 日本トンネル技術協会誌 49(8), 597-607, 2018-08

  • Muography with Multi-Wire-Proportional-Chamber-based Tracking Detectors

    OLÁH László , BALOGH Szabolcs J. , GERA Ádám L. , HAMAR Gergő , NYITRAI Gábor , TANAKA Hiroyuki K. M. , VARGA Dezső

    <p>ミュオグラフィーは巨大物体を貫通した宇宙線ミュオンの飛跡を決定することで,その経路に沿った物質量を求め,巨大物体の内部構造をイメージングする方法である.本論では,MWPC(多線比例計数管)を用いたミュオグラフィ観測システムを示すことにより,その地球科学と土木工学に対する適用可能性を論ずる.大型のモジュラーMMOSシステムが桜島観測用に開発され,活動的火山の内部構造を15 m以下の …

    Journal of The Society of Photographic Science and Technology of Japan 81(3), 269-274, 2018

    J-STAGE 

  • Experimental Report on Verification of Environment Map Generation Inside Abandoned Lignite Mines by Robot Investigation System  [in Japanese]

    MIURA Hiroyasu , WATANABE Ayaka , OKUGAWA Masayuki , MIURA Takahiko

    … <p>There is a danger of collapse in underground cavities, so the cavity filling is in progress. … The cavity filling has been ongoing by local governments. … There is no cavity map in the abandoned lignite mines, and it is required to grasp and explore of the underground space in order to estimate the amount of the filling material. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018(0), 2A1-B10, 2018

    J-STAGE 

  • Field Experiment Report for Verification of Abandoned Lignite Mines by Robotic Exploration System

    Miura Hiroyasu , Watanabe Ayaka , Okugawa Masayuki , Kurahashi Susumu , Kurisu Masamitsu , Miura Takahiko

    … The cavity-filling process by local governments has been ongoing. … There is no cavity map in the abandoned lignite mines, and it is necessary to understand and explore the underground space in order to estimate the amount of filling material needed. …

    Journal of Robotics and Mechatronics 30(6), 1004-1013, 2018

    J-STAGE 

  • Comparison of Combustion and Gasification between Crushed and Block Coals in UCG Model Tests  [in Japanese]

    KODAMA Jun-ichi , TATEKAWA Takuto , NAKA Ryosuke , HAMANAKA Akihiro , ITAKURA Ken-ichi , DEGUCHI Gota , FUKUDA Daisuke , FUJII Yoshiaki

    … <p>Small-scale underground coal gasification (UCG) model tests with a linking hole were carried out using two types of specimens made of either block coal or crushed coal to clarify their characteristics of combustion and gasification. … The shape and dimension of the cavity formed in the both specimens were also similar. …

    Journal of MMIJ 134(7), 91-98, 2018

    J-STAGE 

  • Sensing Technique of Underground Cavity for Maintenance Management of Sewerage Pipe  [in Japanese]

    梅山 聡 , 星野 赳寛

    三菱電機技報 91(9), 492-495, 2017-09

  • Monitoring of coal fracturing in underground coal gasification by acoustic emission techniques

    Faqiang Su , Ken-ichi Itakura , Gota Deguchi , Koutarou Ohga

    … During the underground coal gasification (UCG) process, fracturing and cracks occur inside the gasification zone and surrounding rocks as the underground coal cavity evolves.Although fracturing activity and crack extension directly affect gasification efficiency and have environmental impacts, little research to date has focused on their effects. …

    Applied Energy (189), 142-156, 2017-03-01

    IR 

  • Monitoring of coal fracturing in underground coal gasification by acoustic emission techniques

    SU Fa-qiang , ITAKURA Ken-ichi , DEGUCHI Gota , OHGA Koutaro

    … During the underground coal gasification (UCG) process, fracturing and cracks occur inside the gasification zone and surrounding rocks as the underground coal cavity evolves. … We studied the cavity growth, fracturing mechanism, and the effects of various design and operational variables, such as linking-hole type, gas feed rate, and gasification agent. …

    Applied Energy (189), 142-156, 2017-03-01

    IR 

  • Measurement of tilt change around underground rock cavern with atmospheric pressure change and evaluation of stability of cavity  [in Japanese]

    廣岡 知 , 城代 邦宏 , 冨田 敦紀 , 保田 尚俊 , 塚田 和彦 , 小池 克明

    公益社団法人物理探査学会学術講演会講演論文集 = Proceedings of the SEGJ Conference 137, 81-84, 2017

  • Development and Applicability of Chirp Radar for the Extending of the Penetration Depth  [in Japanese]

    IMAI Toshimune , YAMADA Shigeji

    <p>近年のメンテナンス分野の市場拡大に伴い,道路路面下,港湾施設,河川堤防等における空洞調査において地中レーダの需要が増えている.しかしながら,地中レーダは他の物理探査手法と比べると,分解能は数cm~1m程度と高いものの,極表層部の空洞探査や地質調査にしか適用できていない.一方で,地震探査や電気探査は探査深度1m以上が可能であるが,分解能が数mであり,表層部の詳細構造を検出することが …

    Journal of the Japan Society of Engineering Geology 58(5), 324-330, 2017

    J-STAGE 

  • Study on solution of the thermal fluid phenomenon of the geyser in the volcano zone  [in Japanese]

    TAMANE Masataka , MATSUMURA Kunihito

    … There is the geyser which water in the underground bedrock layer is warmed by terrestrial heat, and spouts out with heated water and water vapor from the surface of the earth in the natural world. … The geyser is defined when there is the cavity where steam can collect in the middle of a crack to continue to the surface of the earth. …

    The Proceedings of Ibaraki District Conference 2017.25(0), 318, 2017

    J-STAGE 

  • Field Experiment Report of Abandoned Lignite Mines by Explore Robot System  [in Japanese]

    MIURA Hiroyasu , OKUGAWA Masayuki , KURAHASHI Susumu , KURISU Masamitsu

    … The cavity filling is currently an ongoing. … There is no cavity map in the abandoned lignite mines, and it is required to grasp and explore of the underground space in order to estimate the amount of the filling material. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2017(0), 1P2-N05, 2017

    J-STAGE 

  • Exploration Technology Using Cosmic Ray Muons for Engineering Geology  [in Japanese]

    SUZUKI Keiichi , KANAZAWA Sunao

    <p>本研究では,地下や大型構造物の密度構造を評価する技術として宇宙線ミュー粒子の物理探査への適用性の検討結果を紹介する.筆者らの調査対象は,地盤の空洞や原子炉の内部構造,断層破砕帯,貯水池の水位変化などで,適用した深さは数mから300m程度までである.また,宇宙線ミュー粒子の物理探査は,対象とする応用地質学的な条件によって計測時間が大きく異なるために,条件の変化に応じた計測時間の長さ …

    Journal of the Japan Society of Engineering Geology 57(6), 266-276, 2017

    J-STAGE 

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