Wu Tingyao, Yu Hongan, Jiang Nan, Zhou Chuanbo, Luo Xuedong
Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan, 430074, Hubei, China.
CCCC Second Highway Consultants Co., Ltd., Wuhan, 430056, Hubei, China.
Sci Rep. 2022 May 23;12(1):8658. doi: 10.1038/s41598-022-12698-0.
Ground blast loads are of great importance to the safe operation of steel and gas pipelines, and the results obtained from traditional theoretical formulas for pipeline safety prediction are in error with the actual measured data. In this paper, full-size field tests and corresponding numerical simulations are carried out using Timoshenko beam theory and explosion stress wave theory, which consider shear effects. At the same time, combined with the theory of foundation stiffness and pipeline stiffness flexibility ratio, a modified theoretical model is obtained in line with the actual conditions of the site, which can accurately calculate the deformation and displacement of pipeline underground explosion load, and greatly reduce the error of theoretical prediction results. The innovation of the research results in this paper is that the theoretical stress in the Timoshenko beam can be replaced by the circumferential strain. On the other hand, the modified theoretical solution can obtain the critical weight of explosives to prevent pipeline damage at different buried depths. It provides a theoretical basis for the protection of pipelines' underground blast loads and provides research ideas for the safe protection and design of pipelines.
地面爆炸荷载对钢质和燃气管道的安全运行至关重要，传统理论公式用于管道安全预测的结果与实际测量数据存在误差。本文采用考虑剪切效应的铁木辛柯梁理论和爆炸应力波理论进行全尺寸现场试验及相应的数值模拟。同时，结合地基刚度和管道刚度柔度比理论，得到了符合现场实际情况的修正理论模型，该模型能准确计算管道在地下爆炸荷载作用下的变形和位移，大大减小了理论预测结果的误差。本文研究成果的创新点在于，铁木辛柯梁中的理论应力可用环向应变代替。另一方面，修正后的理论解可得到不同埋深下防止管道破坏的炸药临界重量。它为管道地下爆炸荷载的防护提供了理论依据，为管道的安全防护和设计提供了研究思路。
