Shuzo Kitagawa

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Yoshiteru Kawakami

Masato SHINJI

Yamaguchi University

Hiromi Ushiyama

Yositeru KAWAKAMI

Hiromi Hata

Tokyo Women's Medical University

Xu Wu

Beijing Municipal Engineering Design and Research Institute (China)

Tatsuya Hasegawa

Mount Fuji Research Institute

Shigeru Miki

Japan Society of Civil Engineers

Yuzo Kajiwara

East Japan Railway (Japan)

Nobuo Nakagawa

Cooperative Institutions

Japan Society of Civil Engineers

Japan Society

Tokyo Women's Medical University

Beijing Municipal Engineering Design and Research Institute (China)

AviChina Industry & Technology (China)

Naval University of Engineering

Xiamen University

Pacific Northwest National Laboratory

University of Science and Technology Beijing

Space Engineering University

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A DESIGN METHOD FOR SECONDARY LININGS IN SQUEEZING GROUND

PROCEEDINGS OF TUNNEL ENGINEERING, JSCE (1997)

Shuzo Kitagawa Toshio Tosaka Tatsuya Hasegawa Nobuo Nakagawa Kazushige Suzuki

10.11532/journalte1991.7.153

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DEFORMATION OF TUNNELS BY GROUND FREEZING

Quarterly Report of Rtri (1985)

Shuzo Kitagawa Yoshiteru Kawakami Toshitaka Baba

It was recognized that the tunnels deformed by ground freezing had common features in mode and progress of deformation, and these deformations were caused by frost heaving of rocks behind the lining. On the frost heaving, the geological factors had the greatest influence. And some of the physical qualities of rocks had each critical value for frost heaving. These results were checked by investigations of tunnels in cold areas and freezing tests of rocks.

Frost heaving

Ground freezing

Frost (temperature)

Frost weathering

Source

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THE MULTIPLIED TUNNEL SUPPORT SYSTEM APPLIED TO SQUEEZING GROUND CONDITION

Doboku Gakkai Ronbunshu (2002)

Shuzo Kitagawa Yuzo Kajiwara Masato SHINJI

北陸新幹線飯山トンネルでは, 膨張性地山に対処するため, 施工時差をおいて支保を二度に分けて施工する多重支保工法を採用した. これは, 膨張性地山のトンネルではある程度坑壁の変位を許容した方が土圧は小さくなること, NATMでの支保は閉合した吹付けコンクリートが最も有効に働くこと, の2点を最大限生かそうとするものである. 施工ならびに計測の結果, たとえ一次支保が破壊しても閉合した薄肉の吹付けコンクリートを主要部材とした二次支保をその内側に施工することで十分変位の収束を図れることが確認できた. また, FEM解析により二次支保の設置時期について検討した結果, トンネル直径の3.5倍程度切羽から離して施工することが支保全体の健全性を保つうえで有効であるとの結論を得た.

10.2208/jscej.2002.721_27

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PROPOSAL OF NEW IDEA FOR TUNNELING METHOD (MULTIPLIED TUNNEL SUPPORT SYSTEM) BASED ON RE-EXCAVATION EFFECT

PROCEEDINGS OF TUNNEL ENGINEERING, JSCE (2002)

Shuzo Kitagawa Shigeru Miki Masato SHINJI Xu Wu

10.11532/journalte1991.12.125

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Behavior of Tunnel and Geological Property in the Squeezing Ground

Journal of the Japan Society of Engineering Geology (2003)

Shuzo Kitagawa

新第三紀堆積岩にトンネルが掘削されたときにしばしば発生する膨圧現象に関して, 現場でよく見られる地山挙動の傾向と膨圧の有無を判定する1指標の提案について論じたものである. 施工事例の分析と模擬地山実験から, 膨圧は, 地山強度比が1を下回る程度にトンネル土被りが大きくなると発生すること, 膨圧現象の時間依存性成分は掘削時に発生する地山の三次元的な弾塑性変形に比べてそれほど大きくないこと, 膨圧の発生機構は地山種別による地山内の応力再配分の違いで説明できること, を示した. また, 膨圧現象の主要因は地山の弾塑性的挙動にあるとの視点から, 地山を構成する岩石試料の繰り返し一面せん断試験により求めた残留強度時の内部摩擦角が膨圧発生の有無の有力な指標になりうるとした.

10.5110/jjseg.44.294

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Deformation of Tunnels by Ground Freezing

Journal of the Japan Society of Engineering Geology (1984)

Shuzo Kitagawa Yositeru KAWAKAMI

Investigation about railway tunnels in cold districts was made to analyze the actual condition of tunnel deformation by ground freezing.As we have expected these tunnels are deforming showing seasonal alteration clearly, deformation is advanced in winter and relived in summer. Shape of deformation shows that lateral earth pressure is much more than vertical earth pressure. Deformed tunnels are located in the specific geological areas in which Pliocene or Pleistocene sedimentary rocks are mainly distributed, but no one is located in hard rocks area. It is observed that frost heaving occurs behind the lining of these deformed tunnels.

Frost heaving

Ground freezing

Frost (temperature)

10.5110/jjseg.25.59

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DENKI-SEIKO (1981)

Hiromi Ushiyama Tadamasa Yajima Shuzo Kitagawa Hiromi Hata

AOD-C-B process was developed in 1978 and since then has been adopted for all AOD heats. The outline of the process is as follows, : the secondary oxygen is blown from the top of the vessel to burn CO to CO2 above the bath surface and the heat generated there is directly transferred to the bath being stirred vigorously by tuyere oxygen and inert gas.The reduction of power and Si consumption and the improvements of the heat economy have been obtained with other operational advantages by this process in last two and a half years.

Tuyere

Inert gas

10.4262/denkiseiko.52.20

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Judgement of Frost Heaving of Rocks by Freezing Test

Journal of the Japan Society of Engineering Geology (1986)

Shuzo Kitagawa Yoshiteru Kawakami

There are some tunnels which have been deformed by frost heaving of rock behind the lining. We already reported about the common features in mode and progress of their deformations. This paper describes the geological conditions of frost heaving rocks which were detected in freezing test of rocks. For unconsolidated earth the past results of studies about frost heaving of soil generally apply, and concerning consolidated earth their strength and grain size distribution of rock are found the most effective indexes for judgment of frost heaving.

Frost heaving

Judgement

Frost (temperature)

Frost weathering

10.5110/jjseg.27.61

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Citations (3)