Improving Earthquake Resistance of Structures by Injection Consolidation of Earth Foundations

Abstract

Based on the analysis of the results of field experiments, recommendations were developed on increasing the earthquake resistance of soil foundations of buildings and structures at the Krasnobrodsky coal open-pit mine, providing conditions for an uninterrupted and safe technological process of minerals extraction and transportation. As a result of research carried out at a pilot test site by the method of seismic sounding using the refraction technique, scientific and practical results were obtained. It has been experimentally proved that compacting soils with cement-sand mortar allows us to improve their deformation properties, which leads to an increase in the earthquake resistance of structures. The seismicity of the soil foundation of the enrichment complex of inclined separation was calculated on the basis of the performed simulation of deformation processes in the consolidated foundation of the structure in a critical state. The studies have found out that when weakened soils are compacted under the supports of the galleries of the structure and after the artificial foundation has gained strength, seismicity decreased from 7 to 6 points.

Failure Mechanism and Stability Control Technology of Slope during Open-Pit Combing Underground Extraction: A Case Study from Shanxi Province of China

“…Restricted by factors such as mining technology and stripping ratio, the mining scope of surface mines is limited to the upper section resources of the entire ore body, and resources not suitable for surface mining at depth are completed by underground mining means [1][2][3]. For horizontal or near-horizontal coal mines with miscellaneous coal seams, it is economically unreasonable to open-pit mine the deeper resources, and a combination of open-pit mining method and underground extraction method is generally used [4][5][6][7]. This form of mining is also known as the method of open-pit combing underground extraction (OPUG) [8][9][10][11][12].…”