TY - JOUR ID - 708 TI - Back calculating the seismic shear strengths of the Tsaoling landslide associated with accelerograph and GPS data JO - Iranian Journal of Science and Technology Transactions of Civil Engineering JA - IJSTC LA - en SN - 2228-6160 Y1 - 2009 PY - 2009 VL - 33 IS - 4 SP - 301 EP - 311 KW - Back-calculation KW - Tsaoling KW - landslide KW - Chi-Chi earthquake KW - Newmark sliding model KW - GPS DO - 10.22099/ijstc.2009.708 N2 - In this study, the seismic displacement-based back-calculation is discussed and is conducted to analyze the shear strength parameters of the Tsaoling landslide under the impact of the Chi-Chi earthquake. Since the intensive earthquake tilted the ground shifted velocity when integrating seismic acceleration records, the co-seismic displacements measured by neighboring GPS stations played an essential role on baseline corrections of the acceleration time-history adjoining the Tsaoline landslide. In addition, an analysis process of combining empirical formula with Newmark’s sliding model simplifies the back-calculation procedure that only assuming the cohesion is required to calculate the internal friction angle of the sliding surface. Although the baseline correction changes the time-history of seismic accelerations, it has an insignificant impact on calculating the shear strength parameters of the Tsaoling landslide. The analysis results indicate that the cohesion is 0 kPa and the internal friction angle is 27.5° for the sliding surface.            UR - https://ijstc.shirazu.ac.ir/article_708.html L1 - https://ijstc.shirazu.ac.ir/article_708_a97d7abf2c7a8114360d8ca8e653c2bb.pdf ER -