Appropriate Factor Of Safety Research Articles

Highwall design for a New Zealand opencast coal mine

The development stages and the highwall design of the No. 16 opencast coal mine in the Ohai coalfield are described. The factors which were considered in the design of the 100 m high batters for the mine are discussed. Of particular concern was the nature of the overburden in the highwall where old underground workings were recorded as having been pillared out. Careful consideration was given to the selection of appropriate factors of safety, representative strength parameters and piezometric conditions for design.

Computers and their use in teaching Geotechnics

An interactive teaching program has been developed for undergraduate use. The program, which calculates the factors of safety for different soil profiles, is capable of accepting coordinates either in polynomial or discrete form. Upon input of other factors such as the strength and the weight parameters the program provides the appropriate factor of safety with an optional plot of the failure surfaces.

PERIODIC THEORY VELOCITY PREDICTION IN RANDOM WAVE

Large waves in a series of random ocean waves are considered in the design of ocean structures. When random structural vibrations can be ignored, periodic wave theories are used to predict the water particle kinematics for a design wave even though the real wave is irregular. This paper presents the authors' first attempt to quantify the validity of using periodic wave theory for random waves. Measurements of maximum horizontal and vertical velocities were made in laboratory generated periodic and random waves. They compared favorably with predictions from periodic wave theories (even with Airy theory) particularly for the large waves in a series. Since the design wave concept is applied to the largest waves, the conclusion is that periodic wave theory may be adequate, providing an appropriate factor of safety is used to account for the differences between the actual maximum wave kinematics in nature and those in the predictive theory.

The External Forces on an Airship Structure

A system of external forces on the structure of a rigid airship can be analysed into two or more of the component systems due to1.W. The Weights of the members of the structure and the weights of the masses carried by it;2.L. The Lift and pressure of the gas;3.A. The Aerodynamic forces consequent on the relative motion of the airship and the air;4.T. The Thrusts of the airscrews;5.R. The Reactions due to either the mooring arrangements, the hauling-in guys, the supports used in the shed, or handling on the ground.As these component systems, though restricted by their interdependence, are individually variable, a very large number of complete systems is represented by the possible combinations and variations that can occur. It becomes necessary, therefore, for the purposes of design, to attempt to limit the number of combinations to be considered, and to restrict the variations of the components, but in such a way that the structure designed to carry the resulting systems with adequate factors of safety, shall be able to carry any other possible system with an appropriate factor of safety.