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基于Mindlin解,经数值积分计算了盾构以一定坡度掘进时切口附加推力与盾壳摩擦力的竖向分量引起的地面竖向位移,并通过现场实测验证了其合理性。计算表明,随盾构俯仰角的增大,在切口附加推力与盾壳摩擦力竖向分量的作用下,沿隧道纵向地面竖向位移呈现总体上移趋势,且切口前方最大隆起出现的位置更加靠近切口;盾构俯仰角一定时,随隧道埋深的加大,切口附加推力与盾壳摩擦力竖向分量作用下的地面最大隆起呈指数型下降。
Based on the Mindlin solution, the vertical displacement of the ground caused by the additional thrust of the cut and the vertical component of the shield friction when the shield is driven at a certain slope is calculated by numerical integration. The rationality of the proposed method is verified by field measurements. The calculation shows that with the increase of the shield pitching angle, the vertical displacement along the longitudinal direction of the tunnel shows a general upward trend under the effect of the additional thrust of the notch and the vertical component of the friction force of the shield shell, and the position where the maximum bulge in front of the notch appears Close to the incision. When the shield pitch angle is fixed, with the increase of the tunnel depth, the maximum lift of the ground under the additional thrust of the incision and the vertical component of the shield friction decreases exponentially.