开挖顺序对 ＰＢＡ 地铁车站竖向土压力分布影响.

By taking the Dongsi PBA station of Beijing Metro Line 6 as an example, the influence of the excavation sequence on the distribution of the vertical earth pressure on the pilots and the station arches was analyzed respectively. The results show that soil pressure on the station arches is bias, and the vertical earth pressure at the arch feet of the outer side pilots is 1. 27 times than that at the inner side pilots. The vertical earth pressure at the outer arch feet of the upper and lower side pilots is about 1. 1 times and 1. 2 times of the gravity stress respectively. The vertical earth pressure on the central pilots is affected by the excavation sequence of the pilots in the same level, and is larger on the later constructed pilots. The vertical earth pressure on the station arch is mainly affected by the construction sequence of the arches. In the "first edge and then middle pilot" construction plan, the vertical earth pressure on the crown arches of the station fluctuates as such that the vertical earth pressure on the side span can be as low as 0. 77 times the gravity stress, while the vertical earth pressure at the junction of the arch and the central pilot can be as high as 1. 05 times the gravity stress. [ABSTRACT FROM AUTHOR]