盾构在矿山法隧道中推进监测分析

摘要

Taking the shield of some subway in the promotion of the mined tunnel at early construction as the background, rthe paper undertakes the supervision and analysis of the stress change process of the segment of the shield pushing construction, sums up the pressure change of the segment under the surrounding soil and the change law of the internal force of the segment reinforcement in the shield construction process, indi- cates the two obvious stages of the segment under the soil pressure along the time and the soil pressure along the ring distribution is uneven and the pressure of the whole soil is not high, the reinforced axial force is increased of the tunnel bottom segment, but the reinforced axial force of the tunnel top segment has unclear change.%以某地铁盾构在先期施工的矿山法隧道中推进为背景，对盾构空推施工时管片的受力变化过程进行了详细的监测和分析，对盾构施工过程中管片受到周围土体的压力变化和管片钢筋内力变化规律进行了总结，管片受到的土压力随时间变化分为两个明显阶段，土压力沿环向分布极不均匀，整体土压力值不高；壁后压浆后，隧道底部管片的钢筋轴力不断增大，但隧道顶部管片钢筋轴力变化不明显。