Liquefaction assessment based on borehole expansion test with Ménard pressuremeter

抄録

The paper presents several methods to evaluate the liquefaction potential of a site. From the simplified method based on the limit pressure to the application of cyclic loading, the pressuremeter has great potential to be compared with the equipment normally used to assess this liquefaction potential. The simplified method consists of constructing a curve limiting two parts of the plane where the pairs of values of the standard limit pressures and the cyclic shear ratio are represented. A method is proposed for correcting the limit pressure measured during pressuremeter tests in sands. A consistent relationship is obtained between the data set and the proposed diagram. The determination of the cyclic shear curve by cyclic tests is another promising approach. As in laboratory conventional testing, cyclic loading is applied to borehole walls at a predefined mean pressure allowing a cyclic stress ratio to be imposed. The protocol and results obtained with and without pore pressure measurement are presented. The methods are detailed and their validation on test databases in calibration chambers or on real sites in different countries is presented.