地下洞室开挖对地表建筑的影响

Influences of excavation of underground carvens on surface buildings

针对地下洞室开挖可能会对地表建筑产生的影响,通过离心模型试验研究了开挖后附近土体的沉降情况,并通过数值模拟研究了地表建筑物的位置、高度和宽度对这种沉降的影响。试验得到了土体中的标志点在开挖过程中的时程曲线,并得到了最终地表的沉降曲线与沉降云图。数值模拟得到了地表建筑物的最大相对沉降和最大水平应变与其位置、高度和宽度的关系。结果显示,当地下隧道恰好从建筑物正下方穿过时,地下隧道顶部的沉降量与水平应变最大;但当地下隧道从建筑物附近穿过时,地表建筑基础的倾斜率可能会更大。

The centrifugal model tests and finite element models are conducted to investigate the influences of excavation of underground carvens on surface buildings. The time-history curves of index points and the settlement curves of the surface are acquired by centrifugal model tests. The effects of width, weight and location of the buildings on the interaction are discussed. It is found that the horizontal strain of the building foundation is the maximum when the underground tunnel crosses the middle of the surface buildings. And while the underground tunnel is near the surface buildings instead of crossing exactly under the buildings, the non-uniform settlement of buildings is more severe.