Research in Ground Support and Its Evaluation for Coordination with System Analysis in Rapid Excavation

摘要

A method of predicting subsurface conditions for future tunnel construction is developed. It describes and rates the rock structure on basis of its need for support in close proximity to the working face. The concept, designated the rock structure rating (RSR) utilizes geologic data and information which could be made available for consideration in the pre-construction period. Methods and techniques used in making geological investigations for tunnel construction are discussed. Correlation between predicted RSR values and actual support installation was accomplished by researching 33 case history tunnel projects. A method, called the rib ratio (RR) concept, was developed by which actual steel rib support installations could be compared on a common basis. Numerical relationships between RSR values, RR's steel rib support and rock loads are established. (Author)