Dynamic behavior and failure of buried gas pipeline considering the pipe connection form subjected to blasting seismic waves

International Journal of Protective Structures

Zhou

et al. 2022

Self Cite

The connecting passage between two adjacent tunnels is conducive to the rescue and evacuation of subway tunnels when disasters occur. The blasting method is usually used in the construction of connecting passage. The vibration caused by blasting construction may endanger the safety of subway tunnel structure. As a result, the influence of blasting pressure on the stability of subway tunnel lining structure during the excavation of connecting passage is studied, and the safe blasting construction distance is proposed, which is crucial to the safety of adjacent subway tunnel lining. This study takes the connecting passage of Wuhan Metro Line 8 as an example. Using Finite element software ANSYS/LS-DYNA, an accurate numerical calculation model of construction site is established. The nonlinear elastoplastic mechanical characteristics of soil, rock, and tunnel lining are simulated by Drucker Prager, Plastic Kinematic, and Johnson Holmquist Concrete constitutive material models, respectively. The credibility of the three-dimensional numerical calculation model and material constitutive model was proved by contrasting the field measured data of the connecting passage with the numerical calculated results. Analysis of numerical results, the axial and radial PPV, frequency, and Von Mises stress of subway tunnel lining are obtained. The influence of subway tunnel lining under adjacent blasting can be obtained by analyzing the distribution law of PPV and Von Mises stress. Non-static tensile strength is needed considering the high pressure and high strain rate process of concrete during blasting. By fitting the relationship between PPV and dynamic tensile stress, and referring to DIF parameters, the safety range of PPV in subway tunnel lining blasting is determined. The critical safety distance between blasting construction and tunnel lining is obtained by Sadovsky vibration velocity attenuation formula, which is used to guide the subsequent blasting excavation of continuous tunnels.

Section: Materials Constitutive Model and Parametersmentioning

confidence: 99%

Dynamic response characteristics of adjacent tunnel lining under blasting impact in subway connecting passage

Xiong

International Journal of Protective Structures

Zhou

et al. 2022

Self Cite

“…For the study of pipelines under blast loads in the past few decades, there have been many experimental and theoretical studies on buried pipelines subjected to ground explosive loads 11 – 13 . As an example, Zhang et al 14 used numerical simulation to study the effects of different factors on pipeline safety, such as the weight of explosives, the horizontal distance of explosives from the pipe, and the burial depth of the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of the deformation for steel gas pipes taking into account shear effects under surface explosion loads

et al. 2022

Sci Rep

Self Cite

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.

“…Furthermore, with the development of computer technology, numerical simulation is widely applied to analyze the effect of blasting on adjacent pipelines due to its convenience and powerful functions. [14][15][16] Francini and Baltz 17 used numerical simulation to research the relationship between the nearby PPV and the cost during the blasting of buried pipelines, and established the pressure of pipelines. Olarewaju et al 18 recommend dynamic finite element method to calculate the response of buried pipeline caused by blasting load based on the review of existing research.…”

Section: Introductionmentioning

confidence: 99%

“…Trivino et al 13 introduced mean frequency analysis to study the variation of energy and frequency under different initiation conditions of multiple detonation sources. Furthermore, with the development of computer technology, numerical simulation is widely applied to analyze the effect of blasting on adjacent pipelines due to its convenience and powerful functions 14–16 . Francini and Baltz 17 used numerical simulation to research the relationship between the nearby PPV and the cost during the blasting of buried pipelines, and established the pressure of pipelines.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response and safety assessment of inner‐wall corroded concrete pipeline in service subjected to blasting vibration

Cao

Zhou

et al. 2022

Structural Concrete

Self Cite

Buried pipelines in urban area are prone to corrosion defects for many years. Ensure the safety of buried corrosion pipelines is a key concern during tunnel blasting excavation. Based on the blasting engineering along Shenzhen Metro Line 12, the field test of full‐scale concrete pipeline adjacent blasting was implemented. The dynamic response of concrete pipeline induced by blasting vibration was analyzed by using the dynamic finite element numerical simulation method, and the reliability of numerical simulation was verified by the field monitoring data. On this basis, considering the corrosion defect morphology of pipeline, the distribution characteristics of peak particle velocity and peak effective stress of concrete pipeline with different corrosion depths, corrosion widths, and corrosion lengths induced by blasting vibration were discussed. The parameter analysis method was used to research the influence of corrosion morphology parameters on the dynamic response of the pipeline, and the corrosion depth of the inner‐wall of the pipeline was defined as the main control parameter of the dynamic response. According to the failure criteria of concrete materials, the safety criterion of corroded concrete pipelines with different service years subjected to blasting vibration was established.