There are sulfate and chloride ions corrosion and carbonation to concrete in coal mine. Based on taking test of accelerated carbonation, corrosion of 3.5% weigh
Based on the fundamental principle of rock mechanics, the stresses of single joint rock mass under three-dimensional compression were analyzed. The effect of th
<正> Because of the complexity and variability of the mine underground roadway, roadway is required to be dynamically generated in 3-D display,viewpoint can be