| 摘要 |
<p>A method for excavating a tunnel wherein the muck from the tunnel face is admitted into the shield; the muck is pressed by a pressure of a predetermined level higher than an active earth pressure in the face and lower than a passive earth pressure as the shield body is moved forward, thereby establishing the balance between the earth pressure in the face ground and the muck pressure; and a liquid of a level balancing the underground water pressure is used to resist the underground water, thereby preventing movement of the underground water, whereby the face is maintained stable; and when the muck pressure is raised over the predetermined level, the muck is discharged out of the shield. A shield tunneling machine embodying the above described method comprises a cutter head (24, 124) allowing the passing of the muck therethrough, a diaphragm (14,114) provided in the shield body (10,110), a muck inlet (16, 116) provided in the diaphragm, a cover member (50, 148,149) adapted to open and close the muck inlet and coupled to an operating means (52, 160) presetting the muck pressure at the aforesaid predetermined level, and a muck chamber provided behind the diaphragm and usually charged with a liquid.</p> |
