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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 displacement characteristics of the horizontal hole wall directly affect the quality of the trenchless horizontal directional drilling pipe laying, and the pressure of the drilling fluid is one of the important factors affecting the displacement of the hole wall. A fast Lagrangian method was used to calculate the response characteristics of near-horizontal borehole displacement in the underground gas pipeline in Los Angeles, USA, using the Mohr-Coulomb criterion. The displacement vector and stress distribution data of x, y and z near horizontal hole wall under different drilling hydraulic pressure (0 ~ 2 MPa) were obtained. The results show that the x and z displacements increase linearly with the increase of the drilling fluid pressure, the z direction changes more obviously and the y direction displacement remains unchanged. At the same time, the displacement change area is concentrated within 1.6 ~ 1.8m from the wall of the hole. Therefore, the reasonable control of drilling fluid pressure range for reducing the wall displacement disturbance is of great significance.