NUMERICAL SIMULATION OF CURVE DIRECTIONAL DRILLING CROSSING THE RIVER OF COAL TRANSFER PIPE

The directional drilling crossing technology has been widely used in kinds of pipe laying engineering, but less used in coal conveyed pipeline engineering. The research offeasibility has important engineering significance. In this paper, study basing on the field of Shenmu-Weinan coal conveying pipelines crossing Weihe carried on the analysis through indoor and outdoor test, established the three-dimensional numerical model of curve directional drilling crossing and analyzed the change of the maximum principal stress and maximum shear stress. Simulation results showing, increasingof the maximum principal stress and maximum shear stresswith the increase of depthwhen drilling into and out of the ground tilt section, which exceed a limit balance state of primary stress and shear stress intensity, forminstability segment; Drill to the middle level, the maximum principal stress and maximum shear stress of hole wall basic remains the same, and the ultimate strength in geotechnical engineering are less than segment. The slurry-supported to deal with soil instability period, through the increase of the shear strength of soil around the pipeline, increase the soil strength. After the analysis results show that the slurry supporting the whole soil were in a stable state. This article research results can be used in the design of crossing engineering pipe support, and can provide a reference for later related engineering construction and technical support.