Application study on numerical analysis method of onshore launching system design for over-length with large diameter HDPE pipe

Abstract

Due to High-Density Polyethylene Pipes (HDPE) hold the characteristics of reliable connectivity and service life, good impact resistance, low fluid resistance and excellent corrosion resistance, especially for large diameter HDPE pipes are more economic, they have been applied to drainage projects. The overlength HDPE pipe with large-diameter has the combined characteristics of rigidity and flexibility, namely, rigidity is dominating within small pile length, flexibility will then dominate with the increasing of pipe length, which lead to onshore launching will be under dynamic changing process, hence the slope of launching ramp, the bearing capacity of the pipeline onshore launching system and the linear control will be very critical, which will make onshore launching of over length HDPE with large diameter more difficult. Based on the numerical dynamic analysis and simulation, and based on the JIGCC Project in Saudi Arabia, the onshore launching process of overlength HDPE with large diameter is studied. The results not only state the loading state of HDPE and launching systems during the onshore launching stage, but also provide a theoretical basis for a more reasonable and economic design of the over length HDPE with large diameter onshore launching system. Introduction