School of Civil and Architectural Engineering,East China University of Technology

为了探究地应力环境对深部硐室岩爆特性的影响,通过FLAC3D数值模拟软件,建立了高地应力环境下圆形硐室的数值模型,结合硬岩在某个特定围压状态下的实验数据,拟合出了硬岩的极限储能值经验公式,基于岩石应力强度比、弹性变形能岩爆判别指标和相关判据,研究不同地应力环境对岩爆的影响。研究结果表明,岩爆产生的风险和对应的岩爆烈度等级均会受到地应力环境的影响。具体表现为当侧向压力系数λ<1.00时,岩爆会产生在硐室两侧,随着侧向压力系数的增加,岩爆判别指标数值减小,硐室发生岩爆的风险降低;当侧向压力系数λ>1.00时,岩爆发生在硐室的顶部和底部,随着侧向压力系数的增加,岩爆判别指标数值增大,硐室发生岩爆的风险增大。

A numerical model of circular chambers under high in-situ stress was established using FLAC3D software to investigate the influence of in-situ stress environment on rock-burst characteristics in deep-buried chambers. An empirical formula for the limit energy storage value of hard rock was developed based on the experimental data of hard rock under a certain confining pressure state. The influence of different in-situ stress environments on rock-burst was studied considering the ratio of rock stress to strength and the index and criteria of rock-burst of elastic deformation energy. The results showed that the risk of rock-burst and the corresponding intensity of rock-burst were affected by in-situ stress environment. Specifically,rock-burst may occur on both sides of chambers when the lateral pressure coefficient λ was lower than 1.00. The value of rock-burst discrimination indexes decreased with the lateral pressure coefficient,and the risk of rock-burst in chambers reduced in this case. Rock-burst may occur at the top and bottom of chambers when the lateral pressure coefficient λ was higher than 1.00,and the value of rock-burst identification indexes increased with the lateral pressure coefficient,which increased the rock-burst risk in chambers.

国家自然科学基金面上基金资助项目(42077255);江西省自然科学基金重点资助项目(2020ACBL203010);东华理工大学博士科研启动基金资助项目(DHBK2019254)