STATISTICAL ANALYSIS FOR LOCATION ARRANGMENT TO MEASURE MECHANICAL PARAMETERS OF ORE BODY IN ION-ABSORBED RARE EARTH MINING

Statistical analysis method is used to arrange locations of measuring points reasonably. The test results of soil mechanic parameters are both accurately and economical quick. In a rare earth mine southern Jiangxi province, 6 measuring points were arranged and each measuring point had 3 test holes. Through pressuremeter test and borehole shear test, the mechanical values of pressuremeter modulus, deformation modulus, compression modulus, cohesion and internal friction angle of ion-absorbed rare earth ore body were obtained. And the spatial variability of the mechanic parameters in ore body was analyzed by classical statistics method and geology statistics method. It is found that the cohesion and the pressuremeter modulus of ore body in test block are strong variation. The variation coefficient of the cohesion is 0.48 and the variation coefficient of the pressuremeter modulus is 0.36. The internal friction angle is weak variation and its variation coefficient is 0.067. It was assumed that the test values of mechanic parameters are truth value and the acceptable error of engineering is 15%. Through classical statistics method and geology statistics method, it is shown that, in this test block, the test result can efficiently estimate the mean and the variation coefficients of ore body's cohesion and pressuremeter modulus by arrangement 5 measuring points uniformly in 45m scope.