非开挖HDD地表变形数值模拟及DCRP识别技术研究

Research of Ground Movement based on Numerical Simulation and DCRP Technology in HDD Method

摘要:

采用非开挖水平定向钻进技术近地表施工时，由于地层及钻井液压力等原因易产生地表变形。结合美国梅萨市一处通信管道施工实例，对0～0.9 MPa钻井液压力作用下的地表变形程度进行了数值分析，得到地表最大隆起量为26 mm。采用DCRP技术及水准仪方法对该变形区域钻井液压力作用前后的地表进行位移检测，得到地表最大隆起量分别为28 mm和30 mm，表明数值模拟分析结果同现场检测结果比较吻合。同时，在现场所布置的26个检测点中，两种方法检测到的隆起量最大相差2.7 mm，表明其精度比较接近。此外，由于DCRP技术属于非接触式三维检测，受施工现场条件及人员操作限制少，故具有较为理想的应用前景。

Abstract:

Due to the complex stratum and drilling fluid pressure, ground movement often occurs during the process of horizontal directional drilling. A project in Mesa of America is introduced in this paper. The ground movement numerical simulation work is based on FLAC3D under different drilling fluid pressure from 0 MPa to 0.9 MPa. The results show that the max distance of z axis is 26 mm. Combined the DCRP technology and leveling method, the author fond that the max distance of z axis are 28 mm for DCRP and 30 mm for leveling method. These results are very near to the simulation results. During the field measurement, 26 targets were fixed on the ground surface. The max difference between DCRP and leveling is 2.7 mm which shows that the accurate is nearly the same. As a noncontact measurement, the DCRP technology is not limited by the field cases and the staff level as leveling method.