To provide an excavation method for excavating a zone having a tunnel overburden depth of 1.0 D or smaller by employing a shield tunneling method without executing an assisting method.
In a process of the execution of the excavation method, vertical earth pressure immediately above a working face is calculated based on a relationship between an overburden depth and weight per unit volume of the ground, and the interior of the chamber 5 is controlled so as to be set at set pressure P0 that is larger than vertical earth pressure P by a predetermined value. Then, by adjusting at least either a rotational speed of an earth removing screw 18 or a propelling speed of a shield jack 27, based on actual vertical earth pressure P1 measured by earth pressure gauges 20a, 20c, pressure in the chamber 5 is controlled. Further by measuring a variation caused by the subsidence or upheaval of the ground by means of a ground subsidence meter 14, the pressure in the chamber 5 is controlled based on a result of the measurement.
YOKOMIZO FUMIYUKI
SAKAMOTO MASAAKI
INOUE SADAFUMI
IZAWA MASAYOSHI
JP2002285788A | 2002-10-03 | |||
JPS62200792U | 1987-12-21 | |||
JP2004197386A | 2004-07-15 | |||
JP2003013687A | 2003-01-15 | |||
JP2006016962A | 2006-01-19 | |||
JP2002038883A | 2002-02-06 | |||
JP2003082979A | 2003-03-19 |