Viaduct piers suffers dynamic disturbance when a high-speed train is going by on them. Mining coal pillars are subject to the gravity load of the overlying strata as well as the dynamic effects of periodic weighting. Most rocks in nature lie in the complicated environment where there is a combination of confining pressure and dynamic loads, and some are under unidirectional constraints (one-dimensional static loads). In addition, the damage model of coal-rock was proposed, and the criterion of coal-rock damage was obtained, which shows that the damage degree of coal-rock increases with the increase of impact load and decreases with the increase of static axial load.
The cumulative damage degree of coal-rock decreases with the increase of axial pressure, and the number of impact needed to destroy coal-rock is increased. When the impulse is constant, the damage degree of coal-rock increases with the number of impact, and the damage curve is upward convex, indicating that coal-rock has a tendency to slow down the damage. Moreover, with the increase of axial pressure, the variation gradient of the damage degree of coal-rock tends to moderate and the cumulative damage degree decreases under the same impulse, and the impact resistance of coal-rock increases. The results show that the damage degree of coal-rock increases with the increase of the impulse, and the damage fitting curve is upward concave, indicating that the coal sample tends to accelerating failure. Meanwhile, the influence of constant impulse on the damage degree of coal-rock was compared. Be it backcountry, rail, jib line or kicker – Gigi Rüf does it like few others.Taking the briquette sample as research object, the influence of the incremental impulse (momentum) on the damage of coal-rock under different uniaxial axial pressure was studied by using the self-developed pendulum impact dynamic loading test device, cooperating with the ultrasonic detection device. Gigi’s infectious personality and cheeky laugh is reflected in his riding style and make him a first choice in any planned road trip or shooting project.
He created the Back Yard camp, hosted at his Uncle’s remote and isolated Mountain Alm above his village, where he also co-organized the European Nixon Jib Fest with Nic Droz and Romain de Marchi.
Outside of his filming duties with Absinthe, he has consistently found time to bag parts with his local crew, Pirate Movie Productions. His touch and finesse when riding has the precision of a watch maker, the power of a heavy weight boxer and the grace of a ballerina – his style has overtures of a Nic Müller or Jamie Lynn. He doesn’t simply read the terrain, he teases it. Gigi doesn’t really ride a snowboard, he dances with it. A tweak master, constant innovator, style sergeant with a pack mule work ethic – if there is light, snow and a slope, Gigi is out there playing with it. He is as grounded today as he was at 13, proudly recently becoming a father of a baby boy with his home town sweat heart. Despite Gigi being recognized as a developing talent at the age of 13, he has never lost touch with the simplicity of his upbringing nor let the hype that followed him as his career exploded distort his laid back, carefree and life loving character.
Not your a-typical snowboarder, his slender, light frame is seen as often on the steep summer slopes of his family’s mountain top farm – scythe in hand – as it is descending from helicopters in Alaska or the Canadian ranges – board in hand. He grew up a child of the mountains and has maintained this simplicity despite his world travels and the international recognition his skills have bestowed. A child prodigy, Gigi hails from the Voralberg region in Austrian, on the back side of the St Anton valley.