# Safety Analysis of Buried Corrosion-Defect Gas Pipeline in Ceramic Soil Layer Under Blasting Action
## 1 Introduction  
In the research field concerning the effects of blasting on buried gas pipelines, domestic and foreign scholars have carried out extensive and in-depth exploration [1, 2, 3]. However, due to the limitation of field test conditions, it is often difficult to fully consider various influencing factors in actual engineering. For example, key parameters such as buried depth, internal pressure, and pipe diameter of pipelines are often ignored in field tests, which limits the accuracy and universality of test results [4, 5]. In the field test, although researchers strive to be detailed and comprehensive in the design scheme and operation process, there are still shortcomings [6]. Limited by the existing monitoring technology and testing means, the data obtained from field tests are often limited in quantity and single in nature [7]. Especially in the acquisition of key data such as stress distribution in pipelines, the existing test means often fail to meet the requirements [8]. This further limits the ability of field tests to fully gauge the behavior of buried gas pipelines under blasting action. In order to make up for the shortcomings of field tests, scholars at home and abroad began to turn to numerical simulation research [9, 10]. Numerical simulation technology, especially using dynamic finite-element software, can simulate complex blasting scenes [11, 12]. A variety of influencing factors are considered to provide a more comprehensive and accurate pipeline response analysis. Through numerical simulation, researchers can obtain data thatare difficult to measure in field tests, such as stress distribution and deformation inside pipelines [13; 14]. Furthermore, the mechanism of blasting effect on buried gas pipelines can be more deeply understood [15; 16]. In domestic and foreign research, numerical simulation has been widely used in pipeline response analysis under various blasting scenarios [17; 18; 19; 20]. By comparing the results of numerical simulation with those of field tests, researchers can verify the accuracy of the numerical model [21] and further optimize the model parameters to improve the reliability of the simulation results. In addition, numerical simulation can simulate pipeline response under different working conditions, providing important references for engineering design and safety protection [22]. When analyzing the reliability of corroded pipes, scholars often assume that the random variables are independent. But this kind of assumption is unreasonable, will cause large errors, and can even engender incorrect conclusions. Thus, a reliability analysis method for corroded pipeline considering the correlation of random variables is proposed, and a sensitivity analysis of the correlation coefficient of random variables is carried out. The corrosion reliability model of long-distance pipeline under the condition of corrosion defect parameter correlation is established, and the pipeline failure probability is calculated. However, the existing studies focus on analyzing the influence of the correlation between the initial defect depth and length on the failure probability, and do not study the influence of the correlation between the corrosion defect depth and length on the inferred value of the corrosion parameters themselves. In fact, pipeline corrosion length can provide more comprehensive information for the prediction of pipeline corrosion depth, which can be used to analyze the reliability of corroded pipelines more accurately [23]. However, although numerical simulation has made remarkable progress in the study of buried gas pipelines under blasting action, some challenges still remain. For example, how to accurately simulate complex blasting scenarios and how to consider the coupling effects of multiple influencing factors remain unclear. These are the current research difficulties and hot spots. Therefore, future research must continue to deeply explore the application of numerical simulation technology in this field to promote the further development of related research.