TBMの仕様と掘削抵抗の関連について

1.はじめに

2.掘削抵抗の基礎式と本研究の目的

3.TBMの諸元

4.施工結果

5.掘削抵抗

 5.1 推力の定数c

 5.2 トルクの定数c

6.考察

 6.1 カッタ間隔s/貫入量p

 6.2 カッタ径による掘削抵抗の増大

7.TBMの設計に対する提言とまとめ

参考文献

キーワード:TBM,掘削抵抗,岩盤強度,推力,トルク,カッタ


Relationship between Specifications and Cutting Forces of TBM

Abstract

Currently, a tunnel boring machine (TBM) is widely used in tunneling. TBM is a full-face machine, therefore the face cannot be observed. This is disadvantageous especially in rapidly changing conditions, as is commonly the case for rock mass in Japan. In previous paper, equations (1) and (2) for estimating rock strength of face with TBM cutting force are proposed based on experimental findings.

  (1)         (2)

σ : rock strength p: cutting depth F: thrust force T: torque.

Constants c andc in equations (1) and (2) should be the function of the design parameters of TBM(tunnel diameter, cutter diameter, cutter distance etc.). In this study, the relationship between constants(c  and c) and design parameters of TBM was examined for ten tunnels.

It was found that constants c was strongly influenced by a cutter diameter d.

  (3)

n is number of cutter. With increase of a cutter diameter, not only contact area with rock ,but also apparent strength of rock increased.

Constants c was also influenced by tunnel diameter and cutter diameter.

(4)

By equation (1)〜(4), thrust force and torque of TBM can be estimated if necessary information is available.

Key word: Tunnel Boring Machine,Cutting Force,Rock Strength,Thrust,Torque,Cutter