Big Rock Candy Mountain is a prominent center of variegated altered volcanic rocks in west-central Utah. It consists of the eroded remnants of a hypogene alunite deposit that, at ~21 Ma, replaced intermediate-composition lava flows. The alunite formed in steam-heated conditions above the upwelling limb of a convection cell that was one of at least six spaced at 3to 4km intervals around the marg...

To acquire a satisfying cutting effect during medium-length hole blasting driving of rock tunnels, an improved wedge method with supplementary the center holes was proposed. Initially, cavity forming mechanism analyzed theoretically. The results suggested that could realize ejection within range from free face to critical depth, and hence reduce restraining force blasting, further accomplish ex...

Rock burst is a catastrophic phenomenon that often occurs in underground rock mass engineering. In order to reveal the essence of hard roof process roadway excavation, particle discrete element method used establish model and simulate disturbance harmonic dynamic load based on analysis accident deep mine. The crack field, stress displacement kinetic energy surrounding disturbed by cyclic were a...

Large deformation of surrounding rock makes the internal space a tunnel cannot meet requirements normal use after support, even leads to instability and destruction structure. In order optimize parameters primary support control rock, field tests numerical simulations are carried out. Based on engineering geological conditions monitoring data four important creep improved Burgers model inversed...

1 2 The common development of vegetation and soil is a central question of plant succession. We 3 asked whether places where aerial parts of woody vegetation die and accumulate on the 4 ground (zones of destruction or 'micro-chablis') played a role in the successional 5 development of vegetation patches on tropical inselbergs and whether causes could be 6 inferred from the analysis of the organ...