**6. Concluding remarks**

**Figure 15.** Comparison of morphology parameters: 1—experimental data; 2–12—spheres quantity of recreated numeri‐

results is presented in **Figure 16**. One can note that used high modelled particles density increases calculation speed and does not have any effect for contact mechanics due to the first

**Figure 16.** Comparison of compression results: blue—standard experiment; red—numerical experiment (one sphere); green—numerical experiment (two spheres); purple—numerical experiment (three spheres); black—improved experi‐

) compression

Validation of experimental and numerical (*Ep* = 78 GPa and *ρs* = 2,650,000 kg/m<sup>3</sup>

cal particle shapes.

ment.

Newton law of motion.

258 Modeling and Simulation in Engineering Sciences

This research work presents an experimental investigation of morphology parameters of sand particles, experimental oedometer tests, numerical DEM modelling of oedometer tests, and comparison of experimental and numerical tests. Based on experimental and numerical testing findings, the influence of morphology parameters on mechanical properties of soil is analysed. It is obvious that this research work represents only one soil type (sand). For other soil types as clay, silt, etc., it is not possible to apply obtained results. Nevertheless, the main idea of this research work shows the importance of results validation between experimental and numer‐ ical ones. Only comparing results, it is possible to choose the same testing procedure in experimental and numerical simulation. Provided numerical simulations in this research work still are not perfect and needs to be improved. For example, stress jumps, which appear in numerical simulations, are doubtful. The explanation of the stress jumps simple—it is neces‐ sary to simulate a bigger particles quantity. In this case, particles for repositioning have not so much space and do not appear big stress jumps. Another way to get smooth and nice numerical simulations compression curve (as in experiment)—simulate particles as ideal spheres. This is what the author wants to show for the readers.

Nowadays simulations oriented on two main things:


In both cases, it is recommended to check the numerical simulations with experimental ones. The influence of the above‐mentioned factors, contributing the accuracy of numerical model‐ ling is a future trend.
