房屋刚度对隧道开挖引起的土体变形的影响

 隧道开挖对地面房屋影响的预测方法通常忽略房屋的刚度，假设房屋随原地面土体的变形而变形。对武汉地铁2号线某标段区间左线盾构隧道施工过程中数个地表沉降监测断面和多栋房屋的沉降情况进行系统的现场监测，揭示出房屋刚度对房屋自身变形有很大影响，不考虑房屋刚度得到的沉降预测结果可能与实际情况相差较大。同时，采用能够考虑土体小应变刚度特性的数值模拟，进一步揭示隧道开挖过程中房屋刚度对地表下方深层土体变形的影响，并讨论这种复杂的隧道开挖–土体–房屋相互作用的机制。研究结果表明，在分析隧道开挖对房屋自身及其下方桩基等结构物的影响时，有必要考虑房屋刚度的影响。

INFLUENCE OF BUILDING STIFFNESS ON SOIL DEFORMATION INDUCED BY TUNNELLING

The stiffness of buildings was ignored in conventional analysis in calculating the influence of tunnelling on adjacent buildings. In this research，the field monitoring was carried out on both surface settlement and building deformation along a construction section of Metro Line 2 in Wuhan. The monitored results are very different from the predicted ones ignoring the building stiffness，which indicate a significant influence of building stiffness on its deformation. Numerical simulation considering the small strain stiffness in the soil constitutive model was then carried out. The results of the simulation revealed the considerable influence of building stiffness not only on the surface settlement but also on the sub-surface soil deformation. The mechanism of this complex tunnelling- soil-building interaction is discussed. The results demonstrate the importance of considering building stiffness when analyzing the influence of tunnelling on buildings and piles.