摘要
基于盾构隧道转动错台模型,提出了一个能够评价偏载作用下隧道纵向变形的位移假设函数,同时结合最小势能原理推导出位移解析解,进而可以计算环间错台和转动变形。依据工程算例,将文中方法和数值模拟的结果进行对比,以此验证了该方法的合理性。研究结果表明偏载工况下,沉降和错台曲线具有明显的非对称性;当隧道轴线由与堆载长边方向平行逐渐转向与堆载短边方向平行的过程中,偏载引起的纵向沉降、错台的区间在减小,但是最大值会增大。同时纵向最大沉降值发生在靠近且位于堆载下方的隧道段,而最大错台量则主要发生在堆载范围之外且临近堆载边界的位置。
Based on the shield tunnel model of rotation and shearing dislocation,a displacement hypothesis function that can evaluate the longitudinal deformation of the tunnel under eccentric loads is proposed.By combining that with the principle of minimum potential energy,the displacement analytical solution of the shield tunnel can be derived,and then the rotation and shearing dislocation deformation between rings can be calculated.According to engineering examples,the method in this paper is compared with the results of numerical simulations to verify the rationality of the method.The results show that:under eccentric load conditions,the settlement and dislocation curves have obvious asymmetrical forms;When the tunnel axis gradually turns from being parallel to the long side of the load to parallel to the short side of the load,the interval of longitudinal settlement and dislocation caused by eccentric load decreases,but their maximum value will increase.And the maximum longitudinal settlement value occurs in the tunnel section that is close to and below the load,while the maximum dislocation value mainly occurs in the tunnel section that is outside the load range but near the boundary of the load.
作者
黄时雨
魏纲
HUANG Shiyu;WEI Gang(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Department of Civil Engineering,Zhejiang University City College,Hangzhou 310015,China)
出处
《低温建筑技术》
2021年第1期101-105,共5页
Low Temperature Architecture Technology
基金
国家自然科学基金资助项目(51778576)。
关键词
盾构隧道
偏载
转动错台
位移函数
纵向变形
shield tunnel
eccentric loads
rotation and shearing dislocation
displacement function
longitudinal deformation
