基于钻液压力的非开挖近孔壁位移响应数值分析  

Horizontal Borehole Displacement Analysis Based on Drilling Fluid Pressure

作　　者：孙平贺[1,2] 安传德 曹函[1,2] 

机构地区：[1]有色金属成矿预测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083 [3]辽宁水文地质工程地质勘察院,辽宁大连116037

出　　处：《地下空间与工程学报》2011年第6期1168-1173,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家留学基金委公派资助项目(20093012)

摘　　要：水平孔壁的位移特征直接影响非开挖水平定向钻进敷设管道的质量,而钻孔液的压力是影响孔壁位移的重要因素之一。采用快速拉格朗日的计算方法,利用Mohr-Coulomb准则对美国洛杉矶地下燃气管道敷设中的近水平孔壁位移响应特征进行了数值计算分析。获得了在不同钻孔液压力(0～2 MPa)条件下近水平孔壁x、y和z三个方向的位移矢量、应力分布数据。分析结果表明,随着钻液压力的不断增加,近孔壁各点的x和z位移呈线性增加趋势,z方向变化更为明显,y方向位移基本保持不变。同时,位移变化区域集中在距离孔壁1.6～1.8m范围之内。因此,合理控制钻液压力的范围对于减少孔壁位移扰动具有重要意义。The quality of pipeline construction with Horizontal Directional Drilling is affected by the displacement of the borehole,and the drilling fluid pressure is an important factor which affects the horizontal borehole displacement.The method of Fast Lagrangian Analysis of Continua and the rule of Mohr-Coulomb are introduced in this paper to analyze the gas pipeline construction in Los Angeles of America by FLAC3D.3D Displacement and stress distribution near the surface of borehole have been got under different drilling fluid pressure（0~2MPa）.As the result shows,x and z displacement are increasing linearly coupled with the fluid pressure increasing.But,there is no change of displacement in they direction.This change is limited in the circle area which is 1.6~1.8 m away from the surface of the borehole.That means,drilling fluid pressure control is a key element in keeping the horizontal borehole stability.

关 键 词：非开挖 水平孔 钻孔液 FLAC3D 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]