DESIGN AND EFFECT OF SITE EXECUTION BY USING AGF-HITM METHOD AT TUNNEL PORTAL WITH UN-EQUIVALENCE PRESSURE

Abstract

Presently, the tunnel portal is located on the slope of halfway up the mountain with un-equivalence pressure or at the creak with small overburden.
In many cases in auxiliary methods, AGF method is applied because of the effective forepiling. Additionally, Tunnel-Jumbo of the general type can be used for AGF method.
In this paper, the basic ideas on the design and the construction of AGF-HITM method developed from the current AGF method were mentioned. In addition, economy, site execution and stability at the cutting face were studied based on the measurement data during construction.