STUDY ON PRESTRESSED CABLE AND ANCHOR PARAMETERS OPTIMIZATION DESIGNS OF DEEP-SEATED ROCK TUNNELS OF COAL MINES BASED ON OBSERVATION AND NUMERICAL SIMULATION

摘要

The wall rock endures more strata stress with the increase of extraction in coal mines. The characteristic of tunnels wall rock distortion is distinctly different from others, and rock support and the maintenance of laneways is a difficult task. It is expected that the problem of wall distortion and failure of deep laneways will be more severe in the future. Optimization design of prestressed cable and anchor for a deep-seated rock tunnel a coal mine in Shandong province. China, is presented based on field observation and numerical simulation using UDEC. As a result, the timbering quality was improved visibly following design optimization and wall distortion and collapse were under effective control.