Development of Improved Design Procedures for Underground Structural Support Systems in Rock.

摘要

An investigation to develop more rational analyses and design procedures than those currently used for structural support systems for underground openings in rock is reported. The primary focues is on analytical procedures that can be used to predict the loads on support systems from the rock conditions,the construction procedure,and the behavior of the support. The non-linear behavior of the loosening rock is also considered. A diagram of project organization is followed by a brief description of each task performed during the first year effort. Completed work on Task 1,collection and review of basic data,and Task 2A, a comparative analysis using spring loaded beam models, 2-D finite element elastic models,and 2-D finite element slip-joint models,is reported. The WMATA Dupont Circle Subway station was selected for the comparative analysis under Task 2,and the WMATA Bethesda subway station was selected for prediction calculations. Recommendations and proposed schedules for future tasks are outlined.