scholarly journals DEM Simulation Based on Scaling Rule

2018 ◽  
Vol 55 (2) ◽  
pp. 95-103 ◽  
Author(s):  
Mikio Yamanoi ◽  
Yoichi Nakata
Keyword(s):  
Dem Simulation ◽  
Simulation Based ◽  
Scaling Rule

STUDY ON MECHANISM OF ROCK FALL AT TUNNEL CUTTING FACE AFTER BLASTING

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Fumi Sato ◽  
Naotaka Kikkawa ◽  
Nobutaka Hiraoka ◽  
Kazuya Itoh ◽  
Naoaki Suemasa
Keyword(s):  
Crack Opening ◽  
Experimental Tests ◽  
Rock Fall ◽  
Tunnel Construction ◽  
Rock Falls ◽  
Dem Simulation ◽  
Tensile Stresses ◽  
Simulation Based ◽  
Small Cracks ◽  
Gas Expansion

There are around 10 casualties due to rock-fall at cutting face annually in conventional tunnel construction in Japan. As from the analysis conducted on the cases involving such casualties, workers were either killed or seriously injured when they works in front of or near the cutting face. For the purpose of evaluating the mechanism of rock fall at tunnel cutting face, this paper performed experimental tests which involved blasting to excavate a model ground of tunnel cutting face, and then analyzed the stress state which is in the cutting face by using Discrete Element Method (DEM) simulation. Based on the results, the tensile stresses remained even when the action of gas expansion due to blasting has completed. Therefore, it is suggested that rock falls might be induced because of the residual tensile stresses. The tensile stresses would gradually open small cracks between rocks and then rocks may suddenly fall after sufficient crack opening due to gravity.

scholarly journals Effectiveness of a Snowboarding Simulation Using the Distinct Element Method

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 101
Author(s):  
Tatsuya Yoshida ◽  
Shogo Nakamura ◽  
Fumiyasu Kuratani
Keyword(s):  
Granular Material ◽  
Distinct Element ◽  
Simulation Method ◽  
Distinct Element Method ◽  
Simulation Methods ◽  
Test Results ◽  
Dem Simulation ◽  
Simulation Based ◽  
Different Shapes ◽  
Element Method

Some snowboarding simulation methods have been developed. Although snow has unique properties such as granular material and continuum, few snowboard simulation methods can reproduce the discrete behavior of snow. Conventional simulations are unsuitable for reproducing the characteristics of snow when ski and snowboard turns carve through snow and create grooves in it with their edges. We developed a snowboarding simulation based on the distinct element method (DEM) to reproduce the characteristics of snow and compare the results of the developed method with those of a conventional simulation method. The developed simulation was validated by comparing with the results of an experiment involving a few miniature snowboards of different shapes and a pseudo-snow slope. The turn trajectory and board posture predicted by the DEM simulation were closer to the test results than those predicted by the conventional simulation.

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