Quarterly Report of RTRI
Online ISSN : 1880-1765
Print ISSN : 0033-9008
ISSN-L : 0033-9008
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Volume 42, Issue 3
Displaying 1-9 of 9 articles from this issue
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PAPERS
  • In-situ Measurement and Consideration on Shield Tunnel
    Yukinori KOYAMA, Shinji KONISHI, Noriyuki OKANO
    2001 Volume 42 Issue 3 Pages 125-129
    Published: 2001
    Released on J-STAGE: June 28, 2007
    DOIhttps://doi.org/10.2219/rtriqr.42.125
    JOURNAL FREE ACCESS
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    The interaction between the ground and tunnel behaviors is not clear, because the mechanism is very complicated. We measured the earth pressure, water pressure and sectional force acting on the tunnel lining at an in-situ slurry shield driven tunnel in diluvium deposit. Then, we investigated a design load on the tunnel lining.
    The overburden at the measured point is about 19 m. Segments, 350 mm in height and 1,000 mm in width, are of the corrugate type made of ductile cast iron.
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  • Core Disking and "Rockburst" in Soft Tuffaceous Rock Masses at Iwate Tunnel
    Takehiro OHTA
    2001 Volume 42 Issue 3 Pages 130-135
    Published: 2001
    Released on J-STAGE: June 28, 2007
    DOIhttps://doi.org/10.2219/rtriqr.42.130
    JOURNAL FREE ACCESS
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    Core disking and tunnel deformation like rockburst occurred at soft tuffaceous rock masses at a point 220 meters below the surface in Iwate Tunnel. The physical properties suggest that these rock masses have the possibility of swelling. The estimated earth pressure affecting the drilling hole is larger than five times the tensile strength of the rocks, which is considered to be a cause of core disking. Plate-shaped rock fragments continuously raveled like rockburst from the face of this tunnel, and deformation at the wall exhibited plasticity. The magnitude of these tunnel deformation is not influenced by either overburden or physical properties of rock masses, but mainly by geological structure.
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  • Seismic Performance Assessment of Existing Pile Group Foundation
    Xiu LUO, Yoshitaka MURONO, Shiro TANAMURA
    2001 Volume 42 Issue 3 Pages 136-142
    Published: 2001
    Released on J-STAGE: June 28, 2007
    DOIhttps://doi.org/10.2219/rtriqr.42.136
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    This paper proposes a methodology to assess the seismic performance of existing pile group foundation, which includes the approaches of investigation, setting of earthquake motion, response analysis and seismic-performance evaluation. This methodology was developed based on the lesson of the Hyogoken-Nanbu Earthquake on January 17, 1995 that caused devastating damage. In order to grasp the suitability of the approach, a pile foundation which experienced the earthquake was taken as the object for assessment, and comparison study was conducted between the analysis and reconnaissance. As a result, the adequacy of the methodology was confirmed to prove good agreement between the two results from the viewpoint of engineering practice.
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  • Measurements and Evaluation of the Rock Bolts under Various Geological Conditions
    Takehiro OHTA
    2001 Volume 42 Issue 3 Pages 143-150
    Published: 2001
    Released on J-STAGE: June 28, 2007
    DOIhttps://doi.org/10.2219/rtriqr.42.143
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    The section between Morioka and Hachinohe (96.6 km) on the Tohoku Shinkansen line passes mountainous inland areas, where there are twenty-one tunnels that are 69 km long in total. The geology surrounding this section consists of various rock facies. When these tunnels were constructed, I measured the axial forces affecting rock bolts and evaluated their effectiveness under different geologic conditions. From the measurements and evaluation, it has been proved that rock bolts are effective irrespective of the geologic condition.
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  • Nonlinear Earthquake Response of Soft Ground with Non-Flat Base
    Yoshitaka MURONO, Shiro TANAMURA
    2001 Volume 42 Issue 3 Pages 151-155
    Published: 2001
    Released on J-STAGE: June 28, 2007
    DOIhttps://doi.org/10.2219/rtriqr.42.151
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    To determine seismic ground motion for seismic design, it is necessary to take site effects into account, such as non-linearity of soil and geological irregularities. In this paper, we discuss these two aspects of site effects. The two-dimensional FEM computer program, therefore, is developed which can take into account the soil non-linearity. From an analytical study, the characteristics of nonlinear wave propagation in soil deposit with a basin edge are clarified.
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  • Experimental Study and Numerical Analysis on Stability of Tunnel Face in Sandy Ground
    Takehiro OHTA, Hideo KIYA
    2001 Volume 42 Issue 3 Pages 156-160
    Published: 2001
    Released on J-STAGE: June 28, 2007
    DOIhttps://doi.org/10.2219/rtriqr.42.156
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    The stability of tunnel faces in sandy ground is influenced not only by the mechanical properties of the ground but also by the groundwater conditions. Sand tank experiments prove that the morphological features of face collapse are influenced by the properties of ground and the groundwater conditions. Experimental simulations by mechanical-groundwater flow coupling analysis have been performed based on the finite difference method to verify that the analysis method is suitable. Parametric numerical analyses are also carried out to study the influence of the mechanical properties on the face stability of tunnels in the water-saturated sandy ground. The analysis results indicate that the face stability decreases considerably when the relative density of ground is less than 80 percent.
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  • Observation of Ground Displacement in Landslide by Monitoring Groundwater Composition
    Hiroyuki SAKAI
    2001 Volume 42 Issue 3 Pages 161-167
    Published: 2001
    Released on J-STAGE: June 28, 2007
    DOIhttps://doi.org/10.2219/rtriqr.42.161
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    A novel method for efficiently estimating landslide behaviors by monitoring the groundwater composition has been examined. Basically, the ion-exchange reaction between the groundwater and soil particles continuously takes place. The reaction rate naturally depends on the area where the reaction undergoes. Accordingly, it is expected that the larger the surface area of the soil particles in the ground, the faster the ion-exchange reaction would apparently be. Therefore, the groundwater composition should be changed before the ground distortion becomes much larger. This phenomenon was successfully observed in fact in some landslides. The useful information on the groundwater composition, which is to be offered to estimate the next occurrence of landslide, is reported, and its meaning is also discussed.
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