Liquefaction Evaluation of Saturated Sand Foundation for Category I Items of Earthquake Resistance in the Survey of Nuclear Facilities

A variety of methods are applied to the survey of a nuclear facility.According to the liquefaction evaluation of saturated sand foundation of category I items,the safety of liquefaction evaluation in the current earthquake resistance design specification is not comparable with the serious consequences of the destruction of a nuclear facility.The safety margin proposed by scholars based on the SPT and shear wave velocity liquefaction evaluation method is wider than the current seismic specification.It is suggested that the latest research results of liquefaction evaluation should be used for comparative analysis in addition to the liquefaction evaluation in accordance with the specification.Based on the actual engineering,the liquefaction probability control value of category Iitems for earthquake resistanceis proposed to be adjusted from 4%to 8%,and the nominal anti-liquefaction safety factor is proposed to be adjusted from 1.45 to 1.2.For the liquefaction evaluation curve based on shear wave velocity,there will be abnormal calculation results under certain conditions,and whether the sand is liquefied or not should be determined comprehensively with geological data.