Report No. : GEO Report No. 353

Report Title : Validation of Geotechnical Computer Program "3d-DMM (SPH Version 2.0)" (2022), 60 p.

Author : R.P.H. Law, J.S.H. Kwan & F.W.Y. Ko

Abstract

Two-dimensional modelling of landslide motions has been routinely used to assess landslide mobility in natural terrain hazard studies. With the advance in digital and computer technology,3-dimensional modelling of landslide motions is not uncommon. The 3-dimensional modelling module, 3d-DMM (SPH Version 1.0), was developed in 2010 based on the numerical technique of smoothed particle hydrodynamics (SPH) that operates on the Microsoft Excel platform.

Three dimensional simulations of landslide debris mobility require pre-processing and post-processing of a large amount of three dimensional spatial data. In order to enhance its efficiency in performing three dimensional landslide mobility analyses, 3d-DMM (SPH Version 1.0) has recently been revamped to 3d-DMM (SPH Version 2.0) that operates on the ArcGIS platform.

The validation exercise of 3d-DMM (SPH Version 2.0) includes a comparison of results of back-analyses of six historical landslides with the field velocity and runout data. It is demonstrated that 3d-DMM (SPH Version 2.0) produced results that were consistent with the field data/observations.

Download Document(s)