高静应力和频繁动力扰动共同作用下矽卡岩动力学特性

发布时间：2018-03-25 05:31

本文选题：岩石力学　切入点：动力学特性　出处：《北京科技大学学报》2014年08期

【摘要】：为进一步揭示深部岩体受到开挖爆破等动力作用时的破坏机理,利用基于SHPB装置的动静组合加载试验系统,首次对中高应变率下矽卡岩在高静应力和频繁动力扰动共同作用时的变形特性、能量规律、破坏模式等进行了研究.随着冲击次数的增加,岩石的弹性模量先增大后减小,而每次冲击时的最大应变整体表现出先减小后增大的趋势,最后一次冲击时弹性模量骤降,最大应变突增,岩石试样发生破坏.单位体积岩石能耗为负值,说明在冲击动载的作用下岩石试样表现出释放能量的特性,这是由于高静应力作用产生的弹性应变能受动力冲击作用诱导而释放;随着冲击次数的增加,单位体积岩石释放的能量先增大后减小.结构致密、强度较高的矽卡岩试样随冲击次数的增加表现出劈裂破坏模式.
[Abstract]:In order to further reveal the failure mechanism of deep rock mass subjected to dynamic action such as excavation and blasting, a dynamic and dynamic loading test system based on SHPB device is used. The deformation characteristics, energy law and failure mode of skarn under the combined action of Gao Jing stress and frequent dynamic disturbance are studied for the first time at medium and high strain rate. With the increase of impact times, the elastic modulus of rock increases first and then decreases. However, the maximum strain of each impact shows a trend of first decreasing and then increasing. At the last impact, the elastic modulus drops suddenly, the maximum strain increases, and the rock specimen is destroyed. The energy consumption per unit volume of rock is negative. The results show that the rock specimen exhibits the characteristics of releasing energy under the action of impact dynamic load, which is due to the release of elastic strain energy induced by the stress of Gao Jing by dynamic impact, and with the increase of impact times, The energy released by the unit volume rock first increases and then decreases. The skarn specimen with dense structure and high strength shows a split failure mode with the increase of impact times.
【作者单位】：中南大学资源与安全工程学院;铜陵有色金属(集团)公司;
【基金】：国家重点基础研究发展计划资助项目(2010CB732004) 中南大学学位论文创新资助项目(2011ssxt270)
【分类号】：TU45

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