A force-equilibrium-based finite displacement method (FFDM) incorporating Mohr-Coulomb (M-C) and Hoek-Brown (H-B) failure criteria is used to compute displacements of a monitored slope undergoing rainfall-induced groundwater table (GWT) fluctuations. The analytical method consists of back-calculating strength and displacement parameters using recorded displacements and groundwater table (GWT) in the 1st event of a series of rainfall-induced GWT changes and predicting slope displacements for other events of GWT changes. Results of analyses for the studied slope indicate that (1) despite various sets of back-calculated strength and displacement parameters are obtained, the accuracy of slope displacement prediction is not affected by using various sets of back-calculated parameters; (2) the accuracy of slope displacement prediction is not affected by the use of different failure criteria (M-C or H-B). To simulate a sliding with variable displacements along the slip surface, a displacement diagram associated with an operational dilatancy angle (ψ) is used, i.e., a negative value of ψ is selected to approximate a sliding mass undergoing a volume contraction. Results of a comparative study preliminarily shows good agreement between the calculated and the measured displacements of the slope. However, further validation for this technique using more observed data are necessary.
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Geotechnical Engineering and Engineering Geology