Blasting to Relieve Pressure Around a Soft Rock Roadway
TIAN Jian-sheng
JING Hong-wen
Abstract：The theory of confined blasting was used to analyze the factors influencing how de-stress blasting in a soft-rock tunnel can relieve pressure in the rock.A test system to determine the pressure relief from blasting was designed.Blasting hardens soft rock by forming a blast cavity and fracture zone.This creates a de-stressed area and transfers geo-stresses into the sur-rounding rock some distance,R,from the wall of the roadway.The pressure relief mav be im-proved by appropriately enlarging the borehole diameter,changing the charge density,using explosives with high detonation velocity,spacing the boreholes so L is greater than,or equal to,2R and by reducing the borehole depth as far as is possible.
Keywords：destrss blastingblast induced cavityfracture zonedistressed zonestress trans-ferring
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( 50-54 )