Safety test platform of a mounded horizontal tank under sand bed foundation subsidence
[Objective]Horizontal storage tanks are commonly used to store oil,gas,and hazardous chemicals,where soil covering has the advantages of reducing media evaporation losses,narrowing the safety distance with the surrounding adjacent facilities,and effectively reducing the damage caused by explosion impact and debris splash.This technology has gradually undergone promotion and application in the petrochemical industry.Geological disasters(such as foundation subsidence and soil collapse)and engineering and construction factors(such as soil cover thickness and slope angle)affect the safe construction,operation,and maintenance of mounded horizontal tanks;therefore,it is crucial to build a platform to test their safety.A safety test platform for mounded horizontal tanks under sand bed foundation subsidence is designed and developed to study their safety under different working conditions,meet the teaching and scientific research needs of the industry,and improve the engineering practice ability of students.[Methods]The platform can simulate the strain change of a horizontal tank under different overburden thicknesses and slope angles and simulate the impact of different subsidence lengths and sand bed foundation heights on storage tank safety;the subsidence displacement of the overburden can be directly observed,and the strain of the tank,as well as the soil pressure around the tank,can be accurately determined,providing a basis for studying the safety of a tank under the effect of sand bed foundation subsidence.[Results]Subsidence tests were conducted on sand bed foundations with different subsidence lengths using the mounded horizontal tank safety testing platform.The results showed that because of the influence of the soil arching effect,the soil pressure showed an increasing trend on the top of the subsidence zone tank and a decreasing trend at the far end of the non-subsidence zone.The soil pressure decreased on the tank side in the subsidence area while it increased on the non-subsidence area tank side.The top of the tank bears axial pressure,the bottom bears axial tension,the subsidence area on the side bears axial tension,and the non-subsidence area bears axial pressure.As the subsidence length increases,more soil around the horizontal tank participates in the subsidence process,increasing the strain of the tank and the soil pressure around the tank with increasing subsidence length,and the changes in the subsidence area are more considerable.[Conclusions]The safety testing platform for mounded horizontal tanks is based on a practical engineering background,balancing engineering practice and scientific research teaching,providing a new platform for scientific research innovation for teachers and students.It can be used to explore the impact of different subsidence methods on the safety of horizontal tanks and to study the soil deformation,tank strain,and soil pressure distribution around a tank during the subsidence process.The research results have important reference value for guiding mounded storage tank design.
safety of horizontal tankmounded horizontal tankfoundation subsidencetest platform
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