ASSESSMENT OF CYCLIC TRIAXIAL BEHAVIOR OF SHIWALIK SANDSTONE

SANA ZAFAR, K.S.RAO

Abstract: The mechanical properties of rock under dynamic conditions are of great importance in which the fatigue strength of rock plays a vital role. This study represents the effect of variable frequency on dynamic properties of Shiwalik Sandstone. Shiwalik sandstone samples were collected from the powerhouse location of UJH Multipurpose Project, Jammu and Kashmir .“Prediction of fatigue life of Shiwalik Sandstone under varying frequency” was done by conducting Cyclic Load test in Uniaxial and Triaxial condition. Cyclic testing was done at three frequencies i.e. 1Hz, 2Hz and 3Hz[2] and at two confining pressures of 5 and 7 MPa[6]. The S-N curve[4] were plotted at different frequencies in uniaxial condition as well as in triaxial condition to explain the fatigue behaviour of soft rock (Shiwalik Sandstone) It has been observed that loading frequency as well as confining pressure has a significant effect on the fatigue life of the rock. As the frequency increases from 1 Hz to 3 Hz the fatigue stress increases. And in triaxial condition as the confinement increases from 5 MPa to 7MPa the number of cycles at failure increases

Keywords: Fatigue life, Shiwalik sandstone, Cyclic load test, Amplitude, Frequency, Base load, Waveform

DOI: https://doi.org/10.15623/ijret.2014.0310011