厦门机场路隧道施工对砌体结构建筑物的影响分析

 隧道施工必然会使地表产生变形，从而对地表建筑物产生不利影响。针对厦门机场路梧村山隧道施工实际，通过现场监测和有限元模拟计算，分析隧道施工对地表砌体结构建筑物的影响。研究表明：掌子面CRD1～4开挖期间对建筑物的沉降影响最大；施工紧凑时隧道开挖对建筑物的影响小，反之影响大；施工过程中应严格控制注浆压力和注浆量，注浆速度宜慢不宜快，以保证建筑物整体均匀抬升；不均匀沉降作用下建筑物底层反应最明显，且抵抗下凹变形的能力比抵抗上凸变形的强；裂缝主要分布于底层纵墙的门窗洞口处，且沿纵墙沉降较小侧向较大侧斜向上升，裂缝开展随不均匀沉降的增大而加剧，反之则减缓。

ANALYSIS OF IMPACT OF TUNNEL CONSTRUCTION ON MASONRY BUILDINGS IN XIAMEN AIRPORT ROAD

Tunnel construction will cause surface deformation inevitably,which has a negative effect on the surface buildings. According to the construction practice of Wucunshan Tunnel in Xiamen Airport Road,the effect of tunnel construction on the surface masonry buildings is analyzed through field monitoring and finite element simulation. The results show that the excavations of tunnel face CRD1-4 have the most important influence on building settlement. Tunnel excavation has little influence on the building under compact construction,and vice versa. The grouting pressure and grouting amount must be strictly controlled in the construction process. It is better to grouting slowly rather than fast,which can ensure the uniform uplift of the whole building. The most obvious response of building under uneven settlement occurs at the bottom story;and its ability to resist down concave deformation is stronger than that to upper convex deformation. The cracks are mainly distributed around the door and window openings in the longitudinal wall at first floor,developing slantwise along the side of smaller settlement to the side of larger settlement. Moreover,the development of the cracks aggravates with the increase of the differential settlement,and vice versa.