New measuring technology of geogrids under load

The geogrids have been widely used in highway and railway projects,but the stress of the geogrids in the reinforcement has not been gotten clearly.In view of the present measuring technology of the geogrids under load,the inductance type displacement meter is introduced to measure the strain of the geogrids in the reinforcement as a testing technology innovation.The inductance type displacement meter is used in the laboratory model tests and the trial section of geogrid-reinforced embankment,and the data measured by the inductance type displacement meters is compared with those measured by usual strain foils and the strain of numerical calculation.The results indicate that the data measured by the inductance type displacement meter is accurate and reliable,and it is applicable to measuring the strain of the geogrids in the field reinforcement.