1999 Volume 9 Pages 271-276
It is known that the load acting on shield segments immediately after the segments are installed is not easy to be evaluated quantitatively nor to be modeled in the design of tunneling at the time being. In order to define quantitatively the earth pressure during tunneling, a real-scale model test is conducted. Based on the experimental results and the results from the in situ measurements. It is concluded that, the brush pressure from tail seal is rather small while, the load acting the segments during the tail of shield is passing through, is dominated by the earth pressures from back-filling or grease, and sometime may results in a large deviatoric earth pressure according to the tunneling condition.
