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Dynamic Response Characteristics and Failure Mechanism of Coal Slopes with Weak Intercalated Layers under Blasting Loads
Advances in Civil Engineering ( IF 1.8 ) Pub Date : 2020-06-30 , DOI: 10.1155/2020/5412795
Guang-wei Liu 1 , Dan-qing Song 2 , Zhuo Chen 3 , Ju-wen Yang 1
Affiliation  

Rock slopes with weak intercalated layers could experience disturbance from various deep mining activities; however, their dynamic stability has not been thoroughly investigated. In this paper, the dynamic response characteristics and failure mechanism of the coal slopes with weak intercalated layers under blasting loads were studied by means of numerical analysis, shaking table tests, and field tests. The effects of dynamic loads with different frequencies on the dynamic response of the slope were analyzed, and the natural frequency of the slope was also determined. The results show that the dynamic amplification effect of the slope is smaller than that of the homogeneous slope, and weak layers weaken the wave propagation in the rock mass. Both experimental and field investigation results show that the slope’s natural frequency was approximately 35 Hz. The slope deformation decreased with the distance of the blasting source. Cracks appear along the weak interlayer firstly under the action of horizontal vibration; then, longitudinal cracks occur at the slope crest. With the increase of dynamic loads, cracks continue expanding, deepening, and penetrating in the main controlled weak interlayer; then, the sliding body presents tensile shear failure along the sliding surface. This study could provide insights into the understanding of the coal slope instability and failure mechanism; this could benefit the blasting operation of the coal slope in fields.

中文翻译:

爆破作用下弱夹层煤质边坡的动力响应特征及破坏机理

夹层薄弱的岩石斜坡可能会受到各种深部采矿活动的干扰;但是,它们的动态稳定性尚未得到充分研究。本文通过数值分析,振动台试验和现场试验研究了爆破荷载作用下弱夹层煤质边坡的动力响应特征及破坏机理。分析了不同频率的动载荷对边坡动力响应的影响,并确定了边坡的固有频率。结果表明,边坡的动力放大作用小于均匀边坡的动力放大作用,薄弱层削弱了波在岩体中的传播。实验和现场调查结果均表明,该斜坡的固有频率约为35 Hz。边坡变形随爆破源距离的增加而减小。裂纹首先在水平振动的作用下沿着薄弱的夹层出现。然后,在坡顶出现纵向裂缝。随着动载荷的增加,裂缝在主要控制的薄弱夹层中继续扩展,加深和渗透。然后,滑动体沿滑动表面出现拉伸剪切破坏。这项研究可以为了解煤质边坡失稳和破坏机理提供见识。这可能有利于煤田边坡的爆破作业。裂纹首先在水平振动的作用下沿着薄弱的夹层出现。然后,在坡顶出现纵向裂缝。随着动载荷的增加,裂缝在主要控制的薄弱夹层中继续扩展,加深和渗透。然后,滑动体沿滑动表面出现拉伸剪切破坏。这项研究可以为了解煤质边坡失稳和破坏机理提供见识。这可能有利于煤田边坡的爆破作业。裂纹首先在水平振动的作用下沿着薄弱的夹层出现。然后,在坡顶出现纵向裂缝。随着动载荷的增加,裂缝在主要控制的薄弱夹层中继续扩展,加深和渗透。然后,滑动体沿滑动表面出现拉伸剪切破坏。这项研究可以为了解煤质边坡失稳和破坏机理提供见识。这可能有利于煤田边坡的爆破作业。这项研究可以为了解煤质边坡失稳和破坏机理提供见识。这可能有利于煤田边坡的爆破作业。这项研究可以为了解煤质边坡失稳和破坏机理提供见识。这可能有利于煤田边坡的爆破作业。
更新日期:2020-06-30
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