By installing FBG sensors on the geogrids, smart geogrids can both reinforce and monitor the stability for geogrid-reinforced slopes. In this paper, a geogrid-reinforced sand slope model test is conducted in the laboratory and fiber Bragg grating (FBG) sensing technology is used to measure the strain distribution of the geogrid. Based on the model test, the performance of the reinforced soil sl...

the problem of a footing on slope is encountered regularly in engineering practice, with some noteworthy examples being bridge abutments and basement excavations. in this paper, the bearing capacity of a footing replaced near a slope crest was studied. model tests were carried out using square model footing of 100 mm width. a tank 0.3 m deep, 0.6 m wide, and 0.9 m long was used for the model be...

The flowslide is reproduced by the quasi-real scale model-slope tests on river sand by artificial rainfall, in which subsurface water movement and downslope deformation are carefully monitored. The rainfall at the intensity of 100 mm/hour on the specimen formed at loose state (9.0-metre long, 1.0-metre wide, 0.5metre deep) have brought about the failure at 2,931 sec after the onset of sprinklin...

1. Self-Organized Criticality 1.1. Introduction There is an abundance of the scale invariant phenomena in nature, e.g. fractals, earthquakes, 1=f noise, uctuation of the stock index, etc. Scale invariance means that there are many scales (or equivalently, no typical scale) in the system. One asks why and how so many diierent scales emerge naturally in a physical system. In 1987, Bak, Tang, and ...

In this study, the failure behaviors of debris flows were studied by flume model tests with artificial rainfall and numerical simulations (PFC(3D)). Model tests revealed that grain sizes distribution had profound effects on failure mode, and the failure in slope of medium sand started with cracks at crest and took the form of retrogressive toe sliding failure. With the increase of fine particle...

Results from a three-year study are presented that integrate field work (in Israel), physical modeling (wind-tunnel testing at UC Davis), and numerical solutions of grain trajectories to model and explain sand transport over a climbing dune. Field grain-size analyses of surfaceand saltation-trap materials taken along various positions of the slope suggest that only smaller particles (< 230 pm i...

We construct a driven sandpile slope model and study it by numerical simulations in one dimension. The model is specified by a threshold slope σc, a parameter α, governing the local current-slope relation (beyond threshold), and jin, the mean input current of sand. A nonequilibrium phase diagram is obtained in the α − jin plane. We find an infinity of phases, characterized by different mean slo...

[1] We study channelization and slope destabilization driven by subsurface (groundwater) flow in a laboratory experiment. The pressure of the water entering the sand pile from below as well as the slope of the sand pile are varied. We present quantitative understanding of the three modes of sediment mobilization in this experiment: surface erosion, fluidization, and slumping. The onset of erosi...

Tracer and indicator microbe runoff experiments were conducted to investigate the influence of solution chemistry on the transport, retention, and release of Escherichia coli D21g. Experiments were conducted in a chamber (2.25 m long, 0.15 m wide, and 0.16 m high) packed with ultrapure quartz sand (to a depth of 0.10 m) that was placed on a metal frame at slopes of 5.6%, 8.6%, or 11.8%. Runoff ...