State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University
College of Water Resource and Hy-dropower, Sichuan University
College of Hydraulics and Civil Engineering, Xinjiang Agricultural University
College of Civil Engineering and Architecture, Xinjiang University
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology

深部工程的高地应力与高地温问题将对地下资源开采和空间利用构成严峻挑战。通过建立深埋高温硐室爆破–卸荷–降温全过程的数值模型,并嵌入率相关岩石本构关系反映钻爆开挖和通风降温过程中的岩体动静态力学响应,分析了不同地应力条件下围岩开挖损伤的时空演化规律。计算结果表明:围岩在动态开挖过程中会由于爆破、卸荷或两者的共同作用产生初始动力损伤,而硐室通风冷却过程所诱发的热应力将在保留岩体中造成额外的热力损伤。在静水应力条件下,围岩动力损伤随地应力量级的提高表现出先减弱后增强的演化趋势,降温损伤则随地应力的上升而单调增大。在非静水应力条件下,硐室拱顶和拱腰附近岩体的动力损伤将随侧压力系数的增大而分别表现出先减小后增大和单调增大的演化趋势;在通风冷却阶段,应力水平较低的拱腰附近未产生显著的热力损伤,而拱顶围岩的热力损伤则随侧压力系数的提升而逐渐增强。

The high-stress and high-temperature issues of deep engineering pose significant challenges to deep resource exploitation and underground space utilization. By establishing a numerical model for the entire process of blasting-unloading-cooling and embedding a rate-dependent rock constitutive model to reflect the dynamic and static mechanical responses of the rock mass, the temporal and spatial evolution of excavation damage under dif-ferent stress and geothermal conditions are analyzed. The results indicate that during dynamic excavation, the sur-rounding rock underwent initial dynamic damage due to blasting, unloading, or both, and the thermal stress in-duced by chamber ventilation cooling caused additional thermal damage within the rock mass. Under hydrostatic pressure conditions, dynamic rock damage shows an evolution trend of initially weakening and then strengthening with the increase in geostress level, while cooling damage continuously increased with the increase in geostress. Under non-hydrostatic pressure conditions, dynamic rock damage near the chamber's crown and arch foot exhibit-ed a trend of initially decreasing and then increasing with the increase in lateral pressure coefficient and a mono-tonically increasing trend, respectively. During the ventilation phase, the cooling effect does not induce thermal damage in rock mass near the arch foot, but cooling damage in surrounding rock near the crown gradually in-creased with the increase in lateral pressure coefficient.

四川省科技计划资助项目(2023ZYD0154);国家自然科学基金资助项目(52369021,11902210);地质灾害防治与环境保护国家重点实验室开放基金资助项目(SKLGP2023K012)

周训乾,刘建锋,姜海波,等.深埋高温硐室围岩开挖损伤规律研究[J].采矿与岩层控制工程学报,2024,6(3):033531.

ZHOU Xunqian, LIU Jianfeng, JIANG Haibo, et al. Excavation damage of surrounding rock of deep high-temperature chamber[J]. Journal of Mining and Strata Control Engineering, 2024, 6(3): 033531.