CAJ | 학술논문

为了探明节理岩体中的巷道爆破开挖后的卸载机理，为实际工程提供理论依据，本文基于离散元数值模拟方法，分析了考虑爆破荷载深埋矩形巷道节理围岩的损伤过程。结果表明：高地应力条件下，爆破开挖会在节理围岩中诱发显著的松动效应，导致洞壁附近形成远大于静态塑性区的动态松动损伤区，使得最终屈服区以外的节理面强度和渗透性等力学参数发生劣化；受爆破荷载的影响，岩体的回弹将产生较大的振动速度，达到m/s量级，是洞壁附近节理面损伤的主要来源；节理的组合方式也会对节理松动产生较大的影响，当节理夹角接近60°时，围岩最容易破坏。
위료탐명절리암체중적항도폭파개알후적사재궤리，위실제공정제공이론의거，본문기우리산원수치모의방법，분석료고필폭파하재심매구형항도절리위암적손상과정。결과표명：고지응력조건하，폭파개알회재절리위암중유발현저적송동효응，도치동벽부근형성원대우정태소성구적동태송동손상구，사득최종굴복구이외적절리면강도화삼투성등역학삼수발생열화；수폭파하재적영향，암체적회탄장산생교대적진동속도，체도m/s량급，시동벽부근절리면손상적주요래원；절리적조합방식야회대절리송동산생교대적영향，당절리협각접근60°시，위암최용역파배。
In order to explore the unloading mechanism of jointed surrounding rock masses after blasting excava-tion and to provide the theoretical basis for actual projects,the damage process of jointed surrounding rock mass caused by dynamic unloading in blasting excavation was analyzed based on the distinct element method. It was pro-posed that the loosing effect was very remarkable,such that a loosing zone was formed in jointed surrounding rock mass,which was probably much larger than in the static plastic zone. As a result,the mechanical parameters of joints in the loosing zone,such as the strength and permeability decreased greatly;a large vibration velocity with a magni-tude of m/s was produced by the rebounding of rock in blasting excavation which was an important damage resource of joints near the wall interference;the statement of joints sets had a great influence on the loosing of joints,and jointed surrounding rock mass was most likely damaged when the intersection angle was 60°.