A series of modified sliding block/sandpaper tests are performed to investigate the relationship between the sliding cycles (Ns) and percentage ultimate strength reduction (PSR) of a woven geotextile. This relationship is then employed to calculate the required sliding cycles (Nreq) for a similar amount of damage induced by various turbid flow conditions. To this end, relationships between PSR and various turbid flow-related parameters, such as flow velocity (Vm), particle concentration (Pc) and resistance to particle breakdown of rock minerals represented by Los Angeles percentage weight loss (AL), obtained in a series of laboratory turbid flow chamber tests are utilised to facilitate the derivation of Nreq. Results of the comparative study show that the values of Nreq can be much larger than 250 for some commonly encountered turbid flow environments, such as Vm ranging between 1.5 m/s and 2.5 m/s, and Pc of several percent. It is also shown that the effect of Vm on the value of Nreq is significant. For all tests using Vm = 2.5 m/s, the corresponding values of Nreq are greater than the maximum value of sliding cycles (Ns = 750) recommended in current sliding block/sandpaper tests, regardless of the aggregate type and particle concentration used in this study. At present, a standardised performance test on abrasion damage of geosynthetic materials is lacking, and the index tests such as sliding block/ sandpaper may require revision to fill this gap.
All Science Journal Classification (ASJC) codes
- Geotechnical Engineering and Engineering Geology