...ARMA 22 469 Meshfree penetration of projectiles into rock Foster, C.D., Atif, M., Chi, S.-W. University of Illinois at Chicago, Chicago, IL, USA Copyright 2022 ARMA, American Rock Mechanics Association This paper was prepared for presentation at the 56th US Rock Mechanics/Geomechanics Symposium...

... ABSTRACT: The rapid excavation and mining (REAM) system utilizes large and medium caliber smoothbore cannon to launch inert kinetic energy projectiles to spall rock fascias for mining and excavation applications. Historically, field tests had been conducted against various obstacles and two...

... gun employs compressed air, which is lead from a tank to a 2 m long barrel. A hollow 'piston', which serves as the carrier for the rock to be broken, is accelerated down the barrel by the compressed air. A buffer at the far end arrests the carrier, but allows the projectile to continue its trajectory...

... ABSTRACT ABSTRACT Ceramic projectiles made from 94% to 99% alumina with a nominal mass of 3.1 gms were fired into granite blocks. The average compressive strength of the ceramic was 800 MPa and that of the rock was 135 MPa. Flat, ogive, conical and pyramidal nose shapes were evaluated...

... of interest can be on the surface, underground, or designed to impact and penetrate into the site (projectiles). Dynamic events of interest are equally diverse: seismic waves from distance earthquakes or explosions; close-in phenomena associated with earthquakes and explosions; vibrations associated...

... INTRODUCTION ABSTRACT Tround International Inc. is currently developing a hard rock drill that uses a salvo of three frangible projectiles to prefracture the rock ahead of a conventional tri-cone bit. This paper reports on a series of experiments conducted for Tround to study...

... INTRODUCTION ABSTRACT An experimental investigation was conducted to study the response of soft, porous rock, green shale, under dry and liquid-filled conditions to normal impact of hemispherically-tipped cylindrical steel projectiles with diameter and mass of 6.35 mm and 31 g, respectively...

... on geological materials. Experimentally determined nonlinear dynamic equations of state and constitutive equations governing material strength are incorporated into a two-material Eulerian code, DORF. With the use of this code, impact studies have been made of projectiles with arbitrary shapes in the r,z...

... and use of high-velocity small-diameter water jets, metallic jets, and projectiles of various materials involve ultra-high-pressure phenomena of fundamental interest. Rock disintegration by water jets has been investigated in the USSR for over a decade. Large-diamete jets of low velocity are used...