基于数字图像的顶管施工土层移动模型试验

为研究顶管施工土层的变形和移动规律,利用数字图像方法观测,建立了顶管施工土层移动模拟的物理模型,研究了顶管土层损失引起的上覆土层变形和移动规律,获得了如下结论:1)顶管施工地层损失引起顶管周围土体向顶管移动,最大变形发生在顶管周围;2)顶管地层移动从顶管周围向地表上方以一定角度传递和扩散,地表沉降范围大于顶管直径,顶管地表变形呈漏斗状,最大沉降在顶管的正上方;3)可以运用随机介质理论和概率积分法预测顶管施工地表变形;4)可以数码望远镜代替相机,采用数字图像方法观测顶管地表建筑物的非均匀变形。

Experimental study on soil's movement and deformation due to pipe-jacking based on digital image correlation method

To investigate the movement and deformation of soil due to pipe-jacking construction, by using the digital image correlation method, the physical model of the pipe-jacking construction is set up. The movement and deformation laws of overburden due to soil loss of pipe-jacking construction are studied and the main conclusions are as follows: 1) the overburden soil moves to the jacking pipe, and the maximum deformation occurs around the jacking pipe; 2) the movement and deformation of soil are transferred and diffused from the pipe to the surface at some angle, the scope of the surface subsidence is more greater than the diameter of the pipe, the surface subsidence takes on funnel, and the largest settlement appears over the pipe; 3) the probability integral method and stochastic medium theory can be employed to predict the surface deformation due to the pipe-jacking construction; 4) using the digital telescope instead of camera can help to use the digital image correlation method to investigate the deformation and failure of buildings due to pipe-jacking construction.