Study on the Shrinkage Error of Similar Material Simulation Experiment
Shrinkage error will impact the results obtained from the observation data when studying subsidence by the method of similar material simulation experiment. Using digital industrial close-range photogrammetry system in the experiment, high-precision observational data is collected. By comparative analysis on the subsidence of the points at different locations, we obtained the distribution law of shrinkage subsidence and horizontal movement which has great significance for the study on how to reduce the shrinkage error effectively.
Analysis of dynamic damage procedure of ground building caused by horizontal distortion
It's very serious for horizontal deformation to damage building.Based on the form of horizontal deformation and damage,the mechanics mechanism of damage to building is analyzed and the dynamic damage process of horizontal deformation is disclosed from the formation process of subsidence,relation between horizontal deformation of building and surface and advance rate of stope.
A re-assessment of coal-pillar design
The formula developed by Salamon and Munro in 1967 has been used for the past 22 yea,rs in th,e design of bord-and-pillar workings in South African collieries. This paper re-assesses the formula in the light of its past performance and examines the effect of mining method on coal-pillar strength. An account is given of the extension of the formula so that it can be applied beyond the empirical range for which it was derived, and the advantages of the extended formula (the squat-pillar formula) are descriptionbed.