ratio of sand cushion to debris

A study on the ricochet of concrete debris on sand

2014-3-1 · In this study, the ricochet phenomenon of concrete debris impacting on sand is investigated by both experiments and numerical simulations. Three types of debris, including 50 mm ∅ concrete spheres, 60 mm and 100 mm chamfered concrete cubes, are employed in the tests. The relationship between the debris impact responses and the incident ...

Rockfall impacts on sand cushions with different soil …

2020-4-1 · Void ratio distribution of sand cushion obtained in DEM simulation: (a) M f = 5000 kg, H = 5.0 m and (b) M f = 10,000 kg, H = 15.0 m. 5. Conclusion. The present study has proposed a method for determining the parameters of a two-dimensional DEM simulation for the problem of rockfall impacts on a sand cushion by considering the soil mechanical ...

Protocol for a BSA cushion for debris removal?

Digest your adipose tissue with collagenase at 37C until it looks fairly well disaggregated. Spin 5 min at 700 x g. Top layer will be pure lipid, second layer adipocytes. Get rid of both of these ...

Model studies on geogrid

The effect of geosynthetic materials includes both geogrid and geocell on bearing capacity of soft soil was carried out by (Zhou and Wen 2008). The result showed that reinforcing sand cushion by ...

Tank Corrosion Protection: Guidelines for …

2019-2-14 · The sand bedding material should be clean of rocks, clumps and other debris and for clean sand capable of passing through a #4 sieve, for washed river sand an alternative acceptable particle size is pass …

The study of effect of sand cushion thickness and …

sand cushion: The first is that the sand cushion has an obvious earthquake absorption effect and with the increase in the thickness of the sand cushion, the earthquake absorption effect is more obvious. This situation shows that the thicker of the sand cushion is, the more energy dissipation, the better the earthquake absorption effect will be.

Numerical modeling on concrete debris ricocheting off …

2013-9-19 · when using sand as the target medium, it is found that concrete debris is more likely to come out of the sand after an impact (Xu et al. 2013). Furthermore, it is obvious that concrete debris is able to stand on a sand surface, while it sinks when it is placed on a water surface. Hence, the definition of ricochet against water may not be

Dynamic deformation characteristics of sands and

A comparison between the strain-dependent dynamic properties of the calcareous and siliceous sands reveals that the calcareous sand has a higher …

PERFORMANCE OF CUSHIONS OF WASTE MATERIALS …

2017-5-14 · 84% when GGBS cushion and fly ash cushion were provided. These values are much more than what were observed when either a sand cushion or a GBS cushion was provided. Table 7. Relative performance of different cushions Type of Cushion Heave (mm) % Reduction w.r.t un-cushioned soil No cushion 38 - GBS cushion 7.14 81

Subaqueous debris flow behaviour and its dependence on …

2004-12-15 · The highest mobility is found for slurries with a low yield stress combined with sufficient competence to allow a moderate settlement of sand during flow. Similar mechanisms are likely to operate in natural subaqueous debris flows and may thus provide an additional explanation for the long run-out distances of those flows.

Research on the buffering measure of rock shed against …

2022-7-4 · Dry granular flow induced by rock collapses and landslides is a typical disaster in mountainous areas. Rock sheds are widely used as protective structures to shield traffic lines against the impacts of rockfall, collapse, and dry granular flow in mountainous areas. However, there are few studies on the buffering mechanism of the rock shed cushion and the damage to …

Influence of particle size on the buffering efficiency of soil …

2021-4-14 · Soil cushion layers are commonly paved in front of protection structures to avoid the direct impact of rockfall and debris flow. This study is devoted to investigating the influence of particles size on the buffering efficiency of a soil cushion layer by experimental and numerical tests. A series of experimental tests are performed by releasing a spherical granite rock block …

Effect of Sand Cushion Thickness and Lateral Extension on …

2020-11-20 · Axial swell, A.S, is equal to the ratio of footing heave to swelling soil thickness (∆H/Hs). Axial swell is 6.04%, 4.308%, 3.468%, and 3.10% fr the sand cushion thickness are equal to 0, ... The effect of sand cushion width on the footing heave has been studied by changing the lateral extension, Le, of sand cushion to be Hc, 1.5Hc, ...

Investigating the effects of clay/sand content on …

2020-4-17 · In this study, we carried out a series of physical experiments using a submersed flume model to investigate how sand/clay content influences the depositional mechanism of submarine debris flows. A three-dimensional biphasic numerical model, with a Herschel-Bulkley rheology, was used to back-analyze the physical experiments. The calibrated numerical model …

Ratios and weights of the plastic and sand used to make …

2022-6-19 · Three treatments were carried out having plastic: sand ratios of 2: 1, 1: 1 and 1: 2. Table 2 shows the weights of the plastic and sand used in each treatment. In the second experiment, concrete ...

All-in ballast: ratio of sand to aggregate | DIYnot Forums

 · That would be necessary if you were making a concrete mix of 1 part cement, 2 parts sand, 4 parts aggregate. Thanks. Store bought all-in ballast has got to be 1 part sand, 2 parts aggregate. Right! So, no-one knows if all-in ballst is standard at 1 part sand 2 parts aggregate.

Effect of Sand Cushion Thickness and Lateral Extension on …

Also, it can be observed that the hea ve of. the footing decreases with increasing the lateral extension, Le, of a sand cushion. The. maximum axial swell value is equal to 5.426% for lateral ...

Experimental study of isolating properties of sand cushion

2005-2-1 · Download Citation | Experimental study of isolating properties of sand cushion | With rigid test block in place of low building with larger rigidity, the simulated test on shaking table for ...