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在盾构隧道施工中,因管片支护和注浆填充,隧道拱顶土体位移受限制,土拱效应不完全发挥,土体剪应力小于其抗剪强度,使得Terzaghi松动土压力理论不适用于盾构隧道。针对这一情况,在Handy理论基础上推导了土的侧压力系数计算公式,得出侧压力系数的变化规律,其值与主应力旋转角度相关,其大小在主动土压力系数和被动土压力系数之间变化;并认为土拱效应的发挥和隧道拱顶位移相关,据此,在Terzaghi松动土压力理论基础上推导了一种可以考虑地层损失和管片刚度的松动土压力计算公式;并通过对土拱高度的讨论,提出一种简化的隧道施工扰动范围判断方法。
In the construction of shield tunnel, due to the support and grouting filling, the displacement of the tunnel arch soil is limited, the soil arching effect is not fully exerted, and the soil shear stress is less than the shear strength, so Terzaghi loose earth pressure theory For shield tunnels. In view of this situation, based on the Handy theory, the calculation formula of the lateral pressure coefficient is deduced, and the variation law of the lateral pressure coefficient is obtained. The value is related to the rotation angle of the main stress, and its size is between the active earth pressure coefficient and the passive earth pressure coefficient Based on the Terzaghi loosening earth pressure theory, a formula for calculating loosening earth pressure which can consider the formation loss and the stiffness of the slab is deduced. The formula On the discussion of soil arching height, a simplified judgment method of tunnel construction disturbance range is proposed.