Critical stability number in rock lined channels

Parametric Study of Steel-Lined Pressure Shafts in Anisotropic Rock

Steel-lined pressure tunnels and shafts are used to convey water from the reservoir to the turbines in high-head hydroelectric power plants. An axisymmetrical multilayer model is often considered by engineers for the design of the steel liner. Stresses and deformations can then be computed with a closed-form analytical solution in isotropic rock. When the rock is anisotropic, the lowest elastic...

Steel-lined Pressure Tunnels and Shafts in Anisotropic Rock

For the design of steel-lined pressure tunnels and shafts in anisotropic rock, it is common practice to assume for the computation that the system stands in isotropic medium with the lowest stiffness measured in situ. In this paper, stresses and displacements in the steel liner of a particular steel-lined pressure tunnel are numerically assessed taking into account the anisotropic behavior of t...

Rock 'n' Rho: regulation of ion channels.

THE SMALL GTPase Rho has three isoforms, RhoA, RhoB, and RhoC, of which RhoA has been widely studied. When the Rho gene was first cloned in 1980s, the physiological function of Rho was thought to be similar to its relatives, the Ras proteins. Unexpectedly, Rho was soon found to be crucial in the regulation of the actin cytoskeleton (10, 11). In the following years, many Rho downstream targets w...

Rock Slope Stability Analysis Using Discrete Element Method

Rock slope stability depends very much on the strength features of the rock and the geometrical and strength characteristics of the discontinuities (e.g., roughness, wall strength and persistence). Since a rock mass is not a continuum, its behavior is dominated by such discontinuities as faults, joints and bedding planes. Also, Rock slope instability is a major hazard for human activities and o...

Rock Stability under Different Fluid Flow Conditions

System reliability approach to rock slope stability

A systematic quantitative methodology for the reliability analysis of stability of rock slopes is presented. A sliding mass resting on an inclined plane and composed of two blocks separated by a vertical tension crack is considered, and a disjoint cut-set system formulation is proposed, with each cut-set corresponding to a different failure mode of the slope. Methods for the evaluation of the s...