隧道洞口边坡变形控制与数值分析

为了保证隧道洞口边坡上建筑物的安全,必须控制边坡变形值,以满足产生的附加应力小于建筑物的允许值.某隧道洞口位于居民区,由于拆迁的不彻底,某居民楼距离隧道边界仅仅3m,所以洞口路堑开挖时要严格控制边坡的变形,保证居民楼正常使用,根据边坡上该建筑物的结构特点和使用年限,确定该边坡允许变形值为15 mm；在采用锚杆、喷混凝土联合钢筋网预加固的前提下,模拟了每步开挖路堑的长度和宽度,得到沿隧道方向每步长度开挖2 m且宽度3 m,边坡变形满足要求,并进行了跟踪监测.此结论可为类似工程的设计、施工提供借鉴和参考.

Numerical analysis and control of the deformation of the slope at the entrance of tunnel

The safety of building on the slope is proved under the premise of the allowance deformation of the slope during cutting at the dense-building area.It is necessary to meet extra stress beyond the allowance of the building to keep the building safe.The entrance of tunnel is located on the resident area and the building is three meters from the tunnel boundary for the halfway removal.In the paper,the permitted value of slope deformation was determined as 15 millimeters considering building structure and its used time.And then pre-reinforced measure of slope was designed under the permission of economy,including anchors and shot concrete and steel net on the surface.At last,excavation length and width of each step of cut was simulated.The result shows that it is feasible to excavate two meters along the length and three meters along the width to meet the need of slope deformation.And the track monitoring was conducted during the construction to meet the requirement.The conclusions can provide the reference for design and construction of similar engineering.