Development of low noise and vibration tunneling methods using slots by single hole continuous drilling

Noma, Tatsuya; Tsuchiya, Toshiro

doi:10.1016/s0886-7798(03)00035-x

Cited by 3 publications

(1 citation statement)

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“…There exists little literature on the analysis and performance of this method in different construction projects. The introductory details of this non-vibrational rock splitting method were overviewed and the drilling and free face forming method for controlled blasting excavation (Kaminiko Tunnel, Japan) was investigated [2]. The applicability of this method was analyzed for the construction of twin-tube tunnels (Follo line project, Norway) using the surface fracturing analysis through FEM (Finite Element Method) simulations [3].…”

Section: Introductionmentioning

confidence: 99%

REV Application in DEM Analysis of Non-Vibrational Rock Splitting Method to Propose Feasible Borehole Spacing

Jafri

Yoo

2018

Applied Sciences

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Most of the tunnel excavation methods involve the use of explosion and vibration techniques that is not feasible in urban areas due to unavoidable production of noise, vibration, and dust. The environmental considerations of tunneling projects in urban areas demand the use of excavation methods in which minimum noise, vibration, and dust is produced. In this study, non-vibrational rock splitting method is introduced that involves the fragmentation of rock segments using a split-wedge system inserted into already drilled boreholes. The main objective of this study is the investigation of important parameters involved in the non-vibrational rock splitting method for improving its efficiency. Discrete element analysis of this method was performed using Particle Flow Code (PFC 2D) and the concept of Representative Elementary Volume (REV) was used to simulate intact rocks based on their unconfined compressive strength and modulus ratio concept. Maximum borehole spacing values were obtained using the numerical simulation of rock splitting process in intact rocks. The numerical analysis results show that increased borehole spacing values can be used for all intact rock types in cases of average modulus ratio and high modulus ratio and also that decreasing the borehole depth generally results in the use of increased borehole spacing.

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Section: Introductionmentioning

confidence: 99%