Quarterly Report of RTRI

PAPERS

In-situ Measurement and Consideration on Shield Tunnel

Yukinori KOYAMA, Shinji KONISHI, Noriyuki OKANO

2001 年 42 巻 3 号 p. 125-129
発行日: 2001年
公開日: 2007/06/28

DOIhttps://doi.org/10.2219/rtriqr.42.125

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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 年 42 巻 3 号 p. 130-135
発行日: 2001年
公開日: 2007/06/28

DOIhttps://doi.org/10.2219/rtriqr.42.130

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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 年 42 巻 3 号 p. 136-142
発行日: 2001年
公開日: 2007/06/28

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 年 42 巻 3 号 p. 143-150
発行日: 2001年
公開日: 2007/06/28

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 年 42 巻 3 号 p. 151-155
発行日: 2001年
公開日: 2007/06/28

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 年 42 巻 3 号 p. 156-160
発行日: 2001年
公開日: 2007/06/28

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 年 42 巻 3 号 p. 161-167
発行日: 2001年
公開日: 2007/06/28

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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REVIEW

Recent Research and Development on Soil and Foundation Engineering at Railway Technical Research Institute (Japan)

Osamu MURATA

2001 年 42 巻 3 号 p. 122-124
発行日: 2001年
公開日: 2007/06/28

DOIhttps://doi.org/10.2219/rtriqr.42.122

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This paper describes the recent research and development on soil and foundation engineering at the Railway Technical Research Institute, including an outline of the study on the Liquefied Stabilization Soil with wasted fiber materials , barrier walls using cement mixture soil with expanded poly-styrol beads to reduce ground vibration and the system to observe embankment deformation using optical fiber.

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ERRATA

Pressure Waves Radiated Directly from Tunnel Portals at Train Entry or Exit

2001 年 42 巻 3 号 p. 173
発行日: 2001年
公開日: 2007/07/19

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Wrong:See PDF attached
Right:See PDF attached

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