摘要
从经典的Mindlin弹性理论公式出发,基于盾构施工工作面推力为圆形均布荷载、盾构外壁与土层的摩擦力均匀分布等假定的基础上,考虑盾构施工推进过程中盾构机位置不断变化的实际情况,建立了盾构施工推进过程的力学计算模型,由此推导了盾构推进工作面附加压力以及盾构机外壁与土层摩擦力作用下隧道周边任意位置地层变形的计算公式。基于随机介质理论,充分考虑隧道开挖施工引起的地层变形的时间和空间发展过程,推导了盾构推进地层损失引起的地层变形计算公式。通过工程实例计算,对盾构隧道施工地层变形的时空变化过程进行了研究,计算结果同实测结果具有良好的一致性。
Based on the two hypotheses： （1） the force on shield working force is round and well-distribution; （2） the frictional force between the out surface of shield and surrounding soil is also well-distribution; the mechanical calculation model of shield is established by using the classical elastic theory of Mindlin. In this model, the changeable location of shield is considered when shield is working. Then the stratum deformation calculating formulas around ttmnel caused by the additional force on the shield working force and the frictional force between the out surface of shield and surrounding soil are deduced. According to the stochastic medium theory, the stratum deformation caused by the loss of stratum which resulted from shield tunnel construction is deduced, in which the time-space effect of stratum deformation caused by runnel construction is considered. A case of history is calculated and the time-space change rules of stratum deformation are studied finally.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第8期2379-2384,共6页
Rock and Soil Mechanics
关键词
盾构隧道
地层变形
随机介质
时空统一预测方法
shield tunnel
stratum deformation
stochastic medium
time-space united calculating method
