In shield tunnel design, total overburden pressure was applied to soft ground. But it is not clear the mechanism of acting earth pressure on the segments. Especially it is not clear to determine of designing earth pressure in stiff clay. And the design force of segment is effected the coefficient of lateral pressure A and the coefficient of subgrade reaction k. In this paper we investigated the relationship between initial and final earth pressure on the segments and studied the earth pressure of segment design in clay based on measurement in site. And we carried out simulating analysis which used the usage method and investigated of A and k for design.
