LIQUEFACTION CONSTITUTIVE MODEL PARAMETRIC STUDY OF P2PSAND AND PM4SAND BASED ON UNDRAINED DSS CYCLIC TEST SIMULATION

• Main Author: Septi Yansyah, Titan
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/72135
• Institution: Institut Teknologi Bandung

There have been many constitutive liquefaction models and the development of their modifications such as UBCSand, DM04, SANISAND, NTUA Sand, etc. However, the problem faced in this constitutive model is the difficulty of understanding the meaning of the parameters used and the way to get the correct values. Often the parameter values used in the constitutive model are based on the results of laboratory tests and the modeling results are relatively less accurate. In this research, constitutive liquefaction models are presented which is quite simple to understand and the parameters used are general parameters whose values can be correlated from the results of field testing. The constitutive liquefaction models are P2PSand and PM4Sand. In the constitutive P2PSand model, the required parameter is only relative density (Dr), while in the constitutive PM4Sand model it requires parameter of relative density (Dr) and contraction rate constant (hpo). Relative density (Dr) parameter can be correlated from the results of field testing N1(60), while for hpo parameter it requires calibration based on laboratory test to get the appropriate results. Simulasi pemodelan Undrained DSS Cyclic dengan software FLAC2D untuk kosntitutif model likuifaksi PM4Sand dan FLAC3D untuk kosntitutif model likuifaksi P2PSand telah dilaksanakan. Berdasarkan simulasi tersebut, masingmasing konstitutif model memiliki kelebihan dan kekurangannya. Konstitutif model likuifaksi P2PSand relatif lebih akurat dalam memprediksi kurva strain path dan kondisi likuifaksi. Sedangkan konstitutif model likuifaksi PM4Sand relatif lebih akurat dalam memprediksi kurva stress path dan kurva hubungan kenaikan tegangan air pori atau Ru terhadap waktu atau siklus. In the end, the constitutive use of the P2PSand liquefaction model is superior because of the ease of use of its parameters which only need the Dr value and without the need for other parameters that need to be calibrated such as the hpo parameter in the constitutive PM4Sand liquefaction model. Another reason is that the constitutive P2PSand model is more accurate in predicting liquefaction conditions than the constitutive PM4Sand liquefaction model.