Method for calculating loosening earth pressure during construction of shield tunnels
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摘要: 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。Abstract: Due to the limitations on vault displacement, such as lining segment support and synchronous grouting, the soil arching effect only plays partial function during construction of shield tunnels, and the shear stress of soil is less than its shear strength. Terzaghi's loosening earth pressure theory cannot be used for this case. To solve this problem, a method for calculating lateral pressure coefficient is deduced based on the Handy's theory. The results show that the lateral pressure coefficient is associated with the rotation angle of the principal stress, and its value varies between coefficients of active and passive earth pressures. Subsequently, the development of soil arching effect is related to the vault displacement of the tunnels. Accordingly, a computational formula for loosening earth pressure is proposed considering the ground loss and the stiffness of the segment based on the Terzaghi's theory. Finally, a simplified method for predicting construction disturbance scope of tunnels is put forward by studying soil arching height.
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