间歇性动态剪切作用下泥质夹层剪切流变特性

发布时间：2018-07-02 13:12

本文选题：爆破 + 动态剪切　；参考：《煤炭学报》2017年07期

【摘要】：动力反复扰动作用是驱动岩体渐进失稳的重要影响因素,为研究爆破振动对岩体软弱结构面的影响,进行了动态剪切力间歇性循环作用下泥质软弱夹层的扰动流变试验,对比分析了试样的单纯剪切流变、单纯循环动态剪切和间歇性动态剪切作用下流变变形特征。研究表明,软弱夹层试样在流变过程中,受动态剪切力间歇性循环扰动时,若初始剪应力水平和动态循环剪切应力峰值均较低,动力扰动对试样流变过程可能无明显的影响。而若初始剪应力水平较接近其剪切强度时,微弱且长期作用的动力扰动也可以加速其流变变形过程。循环动态剪切间歇性扰动作用下试样最终发生流变破坏时,存在一应力状态门槛值,该值由静态剪应力和动态剪应力峰值之和确定。对于受泥质夹层等流变性软弱结构面控制且受爆破振动长期影响的岩质边坡,应进行瞬态动力稳定性和长期动力稳定性的综合评价。
[Abstract]:Dynamic repeated disturbance is an important factor in driving progressive instability of rock mass. In order to study the effect of blasting vibration on weak structural plane of rock mass, the disturbance rheological test of muddy weak intercalation under the intermittent cyclic action of dynamic shear force is carried out in order to study the influence of blasting vibration on the weak structural plane of rock mass. The rheological characteristics of the specimens under simple shear rheology, simple cyclic dynamic shear and intermittent dynamic shear are compared and analyzed. The results show that if the initial shear stress level and the dynamic cyclic shear stress peak value are lower during the rheological process of the specimens with weak intercalation, the dynamic disturbance may have no obvious effect on the rheological process of the specimens under the intermittent cyclic disturbance of the dynamic shear force, if both the initial shear stress level and the dynamic cyclic shear stress peak value are lower. If the initial shear stress level is close to its shear strength, the weak and long-term dynamic disturbance can accelerate the rheological deformation process. Under cyclic dynamic shear intermittent disturbance, there is a threshold value of stress state, which is determined by the sum of static shear stress and dynamic shear stress peak. The transient dynamic stability and long-term dynamic stability of rock slope controlled by rheological weak structural plane of mud intercalation and affected by blasting vibration for a long time should be comprehensively evaluated.
【作者单位】：中国地质大学(武汉)工程学院;重庆城市综合交通枢纽开发投资有限公司;中铁二院重庆勘察设计研究院有限责任公司;
【基金】：国家自然科学基金资助项目(51379194,41102196) 重庆市科技计划资助项目(cstc2014yykf B30003)
【分类号】：TD313

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