A Study on Behavior of Vertical Pre-Reinforced Bolt Bases on Field Measurement in the Shallow Tunnel

Shiroma, Hiromichi; Masuda, Mitsuo; Shinji, Masato; Matsui, Mikio; Nishimura, Kazuo

doi:10.2208/jscejf.62.117

Cited by 1 publication

(1 citation statement)

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“…Firstly, the two-dimensional experiment will not be able to reproduce the natural deformation behaviour of the ground if the bending rigidity of the reinforcing material is too large. From the measurement results in the field, it is considered that the vertical pre-reinforcement bolts have their effect by the axial force of the bolts (Shiroma et al, 2006). Therefore, it is reasonable to use materials for reinforcement in which axial forces are dominant in the ground.…”

Section: Model Testmentioning

confidence: 99%

Consideration of the mechanical behaviour and the influence on ground of vertical pre-reinforcement

Amemiya

Nagata²,

Isago

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The vertical pre-reinforcement bolt method is used to stabilize the ground at the top of tunnels with shallow overburden to prevent ground surface settlement and to stabilize slopes. However, the design of this method is mainly empirical, based on similar construction cases, and a quantitative design method has not been established. Model tests simulating the vertical pre-reinforcement bolt method and its numerical analysis were conducted to establish a rational design concept for the vertical pre-reinforcement bolt method. The results of the model test showed that the vertical pre-reinforcement bolt method can improve the continuity of the ground regardless of overburden and slope angle. It was found from numerical analysis that the spacing, width and properties of the bolts were related to the reinforcement effect.

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Section: Model Testmentioning

confidence: 99%