The wall-rock's stress releasing regularity arose by cavern excavation in the high stress condition
YANG Shu-xin
LI Hong
BAI Ming-zhou
XU Zhao-yi
Abstract：In order to research the spatial and temporal changing regularity of wall-rock's stress arose by cavern excavation in the high stress condition, took the site and experimentation of one underground engineering as an example, did the measurement of in-situ stress, and used the piezomagnetie induction high-precision stress measuring system to tracking monitor the entire changing process of wall-rock' stress during the excavating process in the cavern. The result shows that there are three stage of wall-rock's stress change in the excavating process, that are stress releasing stage, stress adjusting stage and stress stabilizing stage. The change of stress is the most significant in the direction of against the cavern wall, and the in-situ stress is almost wholly released at a distance of 0. 6 m from the cavern wall. Stress change along the cavern wall is slighter, and only 20% of the original value is released. The stress releasing process is completed in the instant of shot. The observation shows that the minimum principal stress has a stress enhancing phenomenon at a magnitude of about 2 MPa during the stress adjusting stage.
Keywords：high stressunderground chamberwall-rock's stressexcavation
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 26-30 )