随钻测斜技术现状与发展趋势

Status of inclination measurement-while-drilling technology and its development trend in the pile foundation field

摘要:

在桩基领域，随着基础设施建筑对桩基础承载能力和桩孔垂直度的质量控制要求越来越高，现有常规桩基成孔监测技术已不能满足要求；在钻探领域，随着深井、超深井、科学钻探井及水平井的成井要求越来越高，由于地层因素、工艺技术等导致的实际钻孔轨迹偏离设计轨迹的井斜问题愈发突出，井斜的监控变得越来越严格，现有仪器已不能很好地满足钻孔轨迹测量的高精度要求。针对上述问题，本文梳理了随钻测斜技术发展现状，并结合地质岩心钻探、旋挖桩孔施工工艺特点，提出实现绳索取心钻探钻孔轨迹和大直径长钻孔灌注桩孔垂直度高精度实时监测的方案，这一思路的推广将对指导施工操作、保证钻孔/桩孔的整体质量产生积极影响。

Abstract:

In the field of pile foundation， with ever demanding quality control requirements for the bearing capacity of pile foundation and the verticality of pile hole in infrastructure construction， the existing conventional pile foundation hole boring monitoring technology cannot meet the requirements； it is also true with drilling of deep wells， ultra deep wells， scientific exploration wells and horizontal wells due to the deviation of the actual drilling trajectory from the design trajectory caused by formation factors and drilling processes. As a result， deviation monitoring becomes more and more strict， and the existing instruments cannot meet the requirements for high-precision drilling trajectory measurement. In view of the above problems， this paper sorts out the development status of inclination measurement-while-drilling technology， and in reference to the characteristics of geological core drilling and rotary pile hole drilling technology， puts forward a high-precision real-time monitoring scheme for the wire-line coring drilling trajectory and for the verticality of large-diameter and long bored pile holes. The promotion of this scheme will positively guide the construction operation and ensure the overall quality of the drilling / pile hole.