摘要
随着煤矿开采深度的增加,冲击地压灾害日趋严重,亟需采用新方法、新理论加以防治.摆型波是在深部岩体工程中发现的新型非线性波,其使岩体出现相对分离和相对压实的不同运动状态,与冲击地压灾害的发生密切相关.针对岩体中软弱结构层的非线性变形特征,引入双曲线模型建立块系岩体中摆型波传播的非线性动力模型,研究软弱层的物理力学性质(最大闭合量、初始刚度和阻尼)对块系岩体动力响应的影响.进一步,基于块系围岩与支护系统互馈作用的理论模型,在无初始地应力和考虑初始地应力的情况下研究巷道支护系统的刚度、让位能力和阻尼耗能作用对巷道顶板动力响应的影响,分析支护系统的受力情况,为新型防冲吸能巷道液压支架设备的吸能让位行为提供理论依据.研究结果表明:基于双曲线模型建立的块系岩体的非线性动力模型能够限制岩块间软弱层的最大变形量.冲击载荷越大,增大软弱层最大闭合量时岩块的加速度降低程度越显著.增加支护系统刚度,增强支护系统让位能力和阻尼耗能能力,均可有效降低巷道顶板的加速度幅值,减轻巷道围岩对支护系统的冲击力,有效保护巷道结构.
With the increase of coal mining depth,the rockburst disaster is becoming more and more serious,so it is urgent to adopt new methods and theories to prevent.Pendulum-type waves are a new type of nonlinear waves discovered in deep rock masses,and make the rock masses appear different stress states of relative separation and compaction,which is closely related to the occurrence of rockburst disaster.Aiming at the nonlinear deformation characteristics of weak structural layers in rock masses,a nonlinear dynamic model of pendulum-type waves in blocky rock masses was established by introducing hyperbolic model,and the effects of physical and mechanical properties(maximum closure,initial stiffness and damping)of weak structural layers on the dynamic response of blocky rock masses were studied.Further,through the theoretical model of interaction between surrounding rocks and support systems,the influence of stiffness,capacity of yield position and energy absorption of support systems on dynamic deformation of roadway roof was studied and the force on support systems was analyzed without and considering the initial geostress,which provides a theoretical basis for the capacity of yield position and energy absorption of the new roadway hydraulic support equipment.The results show that the nonlinear dynamic model of blocky rock masses based on hyperbolic model can well limit the maximum deformation of weak structural layers between rock blocks.The larger the impact load is,the more significant the reduction in acceleration of rock blocks is when the maximum closure of weak layers is increased.Increasing the stiffness of the support systems,enhancing the capacity of yield position and energy absorption of the support systems can effectively reduce the acceleration amplitude of roadway roof,and weaken the impact of roadway surrounding rocks on the support systems,which is conducive to the safety of the roadway structure.
作者
姜宽
戚承志
Jiang Kuan;Qi Chengzhi(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;School of Civil,Environmental and Mining Engineering,The University of Western Australia,Perth 6009,Australia;Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《力学学报》
EI
CAS
CSCD
北大核心
2024年第4期1057-1067,共11页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(51774018,12172036)
长江学者和创新团队发展计划(IRT_17R06)
2022年国家建设高水平大学公派研究生项目(202206540052)资助。
关键词
块系岩体
摆型波
双曲线模型
冲击地压
巷道支护
初始地应力
blocky rock masses
pendulum-type waves
hyperbolic model
rockburst
roadway support
initial geostress
