BACK CALCULATION DETERMINATION OF THE MODULUS ELASTICITY OF LIMESTONE ROCK BASED ON PRESSUREMETER TEST DATA
Abstract
Pressuremeter Test (PMT) is an in situ method of soil investigation that is used to determine the pressure and strain behavior of the soil or rock. At pseudo-elastic phase, this behavior can be described by the PMT’s output parameter, modulus presurremeter (EPMT). It has been realized for a long time that EPMT cannot be used directly to describe modulus elasticity (E) from the ground so a correction is needed. Menard and Rousseau suggested that Menard's α Factor be used to correct the value of EPMT that determined empirically according to soil type, density conditions, and deformation behavior of soil or rock when given pressure (rheological properties). Therefore, it is necessary to study PMT behavior along with Menard's α Factor values in a variety of more specific sample types. In this study Back Calculation will be performed on the value of E from PMT testing on limestone sedimentary rocks by remodeling PMT using Finite Element Method (FEM). Back Calculation is a mathematical recalculation process of estimating the value of a data from an event along with related parameters. The results of the study show that there is a good correlation between the modulus of elasticity of the results of PMT and the modulus of elasticity of the Back Calculation. Menard correction factor in this study is consistent with the results of previous research that is equal to 0.47 where this value increases with the increase in the depth of the test sample.
Full Text:
PDF (Bahasa Indonesia)References
Abed Y., Bahar R., Dupla J.C., Bouzid DJ. A. (2013), Identification Of Granular Soils Strength And Stiffness Parameters By Matching Finite Element Results To Pmt Data, World Scientific.
Baguelin F., Jezequel J.F., Shields D.H. (1978), The Pressuremeter and Foundation Engineering, TransTech Publications, Clausthal-Zellerfeld, Germany.
Balachandran K. (2016), Statistical And Numerical Analyses Of Pressuremeter Tests In Glacial Tills, (Ryerson University, Canada.
Briaud J.L. (1992), The Pressuremeter, A.A. Balkema, Brookfield, VT, USA.
Gambin M.P. (1990), The History of Pressuremeter Practice in France, Proc. of 3rd International Symposium on Pressuremeters, Oxford University, Thomas Telford Limited, London; 5 – 24.
Levasseur S., Malecot Y., Boulon M., and Flavigny E. (2009), Statistical inverse analysis based on genetic algorithm and principal component analysis, Application to excavation problems and pessuremeter tests, International journal for numerical and analytical methods in geomechanics, 34: 471-491.
OYO Corporation (2006), Elastmeter-2 Manual (Oyo Corporation, Japan.
Rita O. (2008), Characterization Of Materials Behaviour By The Pressuremeter Test, Técnico Lisboa, Portugal.
Sedran G., Failmezger R.A., and Drevininkas A., (2013), Relationship between Menard EM and Young’s E moduli for cohesionless soils, Proceeding of the 18th International conference on soil mechanics and geotechnical engineering, Paris 2013.
Yeung S.K., Carter J.P. (1987), Finite Elements Studies Of The Pressuremeter Test, Conference on Finite Element Methods in Engineering, Melboume.
