地应力钻孔施工关键技术探讨

汶川地震后,地应力研究受到重视,应力孔施工也日渐增多。本文依据多个项目实践经验,总结了地应力钻孔施工中的一些主要技术问题,介绍了钻孔结构设计按照终孔直径选择、监测仪器安装以及地层条件来综合考虑的方法。特别是从保证技术套管的使用和起拔安全,保障仪器安装精度的扩孔技术,冲洗液的选择与控制,应力测量与应力监测仪器安装的技术保障措施等应力孔施工关键技术方法方面探讨和总结了该类型钻孔施工技术特点和技术经验,系统总结了孔内应力测量和监测仪器安装技术方法,对同类项目的开展具有一定的借鉴和现实指导意义。

Key Technology Analysis on Stress Borehole Operating

After the Wenchuan Great Earthquake, the stress research has been paid attention more and more, and the stress boreholes are being increased in practice. According to multiple projects’ practice, this paper summarizes some key problems in stress borehole operating, and introduces some notices, for example, the stress borehole should be designed according to the end hole’s diameter, monitoring equipments should be installed according to the stratigraphic conditions. From the aspects of ensuring safety for technique casing pipe and pulling out pipe, the enlarging hole technique ensured to equipments installation, selection and control of flushing fluid, stress monitoring, this paper discusses and summarizes the operating technique characteristics and experiences, which can provide some guide for same projects.