Determining dynamic load on a buried gas pipeline under mining machinery actions based on test and numerical simulation

In order to determine the dynamic load of bucket tip of an excavator during contacting a buried gas pipeline, dynamic and static response tests were performed to reflect two action modes including static load and impact of a hydraulic backhoe excavator's bucket tip contacting the pipeline. Load time-history curves were simulated with ADAMS multi-body dynamics software according to the dynamic test data. STEP function and the script control technology were combined and used, the dynamic force transfer process of the excavator was converted into the displacement and speed control of cylinders, then the dynamic load time-history curves of the bucket tip of the extreme were obtained during the excavator contacting the pipe with five-tooth and one-tooth. Finally, the dynamic load time-history curves were induced into the finite element commercial software ANSYS/LS-DYNA, the dynamic response of the pipe was analyzed, the dynamic strain response of the pipe agreed well with field test results. The test and calculation results showed that the proposed method to determine the bucket tip load of a mining machinery based on the combination of test and numerical simulation is feasible, and the research can provide correct data for quantitative assessment of mechanical damage of a buried gas pipeline under mining machinery actions.