基于跨孔CT和HDD的地下障碍物探测方法

An underground obstacle detection method based on cross-hole CT and HDD

为克服跨孔地震波层析成像方法在非开挖区间内障碍物探测方面存在定位精度低、探测不准确等问题,提出一种基于跨孔地震波层析成像(CT)技术和水平定向钻进(HDD)技术的地下障碍物探测方法.首先采用HDD技术沿地下结构纵向方向钻孔并布设管道,而后在管内布设专用仪器,采用跨孔地震波CT技术对非开挖区间内障碍物进行定位和识别.为验证该方法的可行性,以一顶管施工的自来水干管为例,采用该方法探测施工路径地下障碍物分布情况.结果表明,该探测方法能够准确定位非开挖区间地下障碍物,探测精度高、准确性好,具有良好的应用前景.

To overcome the problems of low positioning accuracy and inaccurate detection of cross-hole earthquake wave tomography（ CT）,an obstacle detection method for trenchless underground linear structure is proposed by integrating cross-hole earthquake wave CT technology and horizontal directional drilling（ HDD） technology. Firstly,drilling and laying pipes along the longitudinal direction of underground structure are complemented with the aid of HDD technology. Then,the underground obstacles in the trenchless zone are detected by use of cross-hole earthquake wave CT technology. To verify the feasibility of the proposed method,a water main pipe of pipe-jacking construction is taken as an example to detect the distribution of obstacles. The result shows that the proposed geophysical prospecting method has a high precision of detection and good application prospects.