水平定向钻管道穿越中力学参数研究

针对目前定向钻管道穿越工程的理论与力学分析方面在很大程度上依靠经验，力学参数值难以定量确定的问题,通过对定向钻穿越施工中的土压力、泥浆压力等关键参数的理论分析，指出穿越工程中的三类垂直土应力，提出了最小需要泥浆压力和最大允许泥浆压力两个新概念，并推导出各自的计算公式。依据该公式对某管道穿越工程进行分析，得到了关键力学指标的定量值。水平定向钻管道穿越中力学参数的理论化可为工程实际提供参考。

MECHANICAL PARAMETERS OF PIPELINE CROSSING BY HORIZONTAL DIRECTIONAL DRILLING

Research on mechanical parameters of pipeline crossing by horizontal directional drilling is rare and the engineering is almost designed by experiential method. So there is a need to have more study on mechanical analysis of pipeline crossing design. In this paper, soil mechanical parameters in construction of pipeline crossing are analyzed and the new concepts of minimum required mud pressure and maximum allowed mud pressure are put forward. Then, the formulas of vertical soil pressure and mud pressure in the construction are given．Using these formulas，an engineering of pipeline crossing by horizontal directional drilling is analyzed and the quantitative values of soil stress and mud pressure are obtained. The theorization of mechanical parameters in pipeline crossing can provide the reference for the engineering practice.