冲击映像法及其在超长距离顶管施工泥浆套检测中的应用

Impact image method and its application in the detection of slurry for long-distance pipe jacking construction

泥浆减阻是超长距离顶管施工中的一项关键技术,泥浆套厚度与工程质量息息相关。基于冲击映像法的基本原理,提出一种精确掌握顶管施工注浆充盈状况的快速检测方法,并通过模型试验和现场试验对检测方法的有效性进行研究。根据模型试验结果,将归一化冲击响应强度作为反映泥浆充盈状况的评价指标,成功应用于苏州一大型引水工程中。研究表明:较传统压力观测法,冲击映像法在检测泥浆套厚度方面有明显的优越性,有效提高了检测效率和高阻力区的识别能力,据此对泥浆薄弱区进行定点补浆,节约了施工成本,可在同类工程中推广使用。

Resistance-reducing with slurry is a key technique in the construction of long-distance pipe jacking.The thickness of the slurry is closely related to the engineering quality.Based on the basic principle of impact image method,a rapid detection method for accurately grasping the distribution condition of slurry outside the pipe jacking is proposed in this article,and the validity of the detection method is explored through model test and field test.According to the results of model test,the normalized impact response intensity is taken as the evaluation index to reflect the distribution condition of slurry.Finally,it has been successfully applied to a large-scale water diversion project in Suzhou.The research shows that the impact image method has obvious advantages over the traditional pressure observation method in detecting the thickness of slurry,which effectively improves the efficiency of detection and the identification ability of high resistance zone.At the same time,the construction cost can be greatly saved by replenishing the weak area of slurry precisely.This method can be popularized for similar projects.