爆破作用对深埋球形洞室开挖影响分析

摘要

Excavate deep spherical cavity by blasting. based on the Hoek-Brown criterion, an analytical expression about the stress distribution of flexible area, plastic area and the plastic zone radius of deeply covered-up spheroid hole room are given. The conclusion of deep burying cavern surrounding rock parameters on the influence of stress is given. Explosion effect on the surrounding rock in-creases with decreasing distance between the interior wall and explosive detonation point; Explosion effect on the surrounding rock in-creases with decreasing strength rock masses; Explosion effect on the surrounding rock increases with decreasing stress.%采用爆破方式对深埋球形洞室进行开采，基于Hoek-Brown强度准则，推导出爆破应力初始最大应力波波峰作用下深埋球形洞室围岩的弹性区和塑性区分布，以及塑性区半径的公式表达。总结深埋洞室围岩参数对爆破应力的影响，洞室内壁距离炸药爆点越远，爆炸对围岩的影响越小；岩体强度越大，爆破应力在开采中产生的爆炸效果越小；爆破在开采过程中产生的作用效果随着地应力的增加逐渐减小。