隧道工程勘察水平孔钻进钻具的运动与受力分析

Analysis of movement and force of horizontal drilling toolsfor tunnel engineering investigation

摘要:

川藏铁路隧道工程勘察水平孔工作量大，钻具阻力大、施工深度大、难度大、孔内事故率高，现有技术不能满足其隧道工程勘察水平孔施工要求。在充分调研石油、煤炭、地质勘探行业现有水平孔施工技术现状的基础上，分析了隧道工作勘察绳索取心钻进水平孔钻具的回转及振动的运动规律，确定了钻杆处于临界弯曲状态下极限弯矩及钻杆失稳变形的临界荷载计算公式，通过数值模拟的方法初步研究了钻杆所承受的摩阻力。

Abstract:

Many problems were encountered in tunnel engineering investigation for the SichuanTibet Railway project, such as large workload, great resistance to drilling tools, large drilling distance, great drilling difficulty and high down hole incident rate. The existing technology cannot meet the requirements of horizontal hole drilling of the tunnel project. Based on full investigation of the present status of horizontal hole drilling technology in petroleum, coal and geological exploration industries, this paper analyzes the movement law of rotation and vibration of the wire line core drilling tool for horizontal hole drilling in tunnel exploration, and the critical load calculation formula is developed for the ultimate bending moment with the drill pipe at both the buckling and the critical bending state. The friction resistance on the drilling tool is studied by numerical simulation.