Shaking table tests on the stability of dip and anti-dip rock slopes with structural planes induced by seismic motions

IF 6.9 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Engineering Geology Pub Date : 2024-09-05 DOI:10.1016/j.enggeo.2024.107707
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Abstract

Benched rock slopes are prevalent in extensive engineering endeavors such as mining and road construction. This research investigates the dynamic response patterns and failure mechanisms of dip and anti-dip rock slopes through shaking table tests. The adopted approach involves utilizing the acceleration amplification factor (AAF) to compare the amplification effects on both slope types under varying excitation amplitudes. Fourier spectrum analysis of acceleration is conducted to explore the relationship between seismic wave frequency and slope response. The Hilbert-Huang Transform (HHT) method is employed to analyze the differences in seismic response between dip and anti-dip slopes. The results reveal that anti-dip slope exhibits superior stability compared to dip slope, as the latter experiences earlier failure. The study also identifies the critical excitation intensity value (“threshold point”), indicating the evolution of benched slope dynamic response. The findings demonstrate that dip slopes are more significantly affected by seismic motion, exhibiting higher energy concentration and release. The seismic wave propagation in dip slope also shows a greater energy release compared to anti-dip slope. These outcomes should provide valuable insights for the design and seismic disaster risk assessment of benched slope engineering in regions with high seismic activity. The findings highlight the increased risk of slope failure in dip slopes and emphasize the importance of considering slope stability in engineering projects. The approach proposed in this study, along with the identified critical excitation intensity value, can aid in understanding and mitigating the potential risks associated with benched slope engineering.

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地震运动诱发的具有结构平面的倾斜和反倾斜岩石边坡稳定性振动台试验
在采矿和筑路等广泛的工程活动中,带凹槽的岩石斜坡非常普遍。本研究通过振动台试验研究了倾斜和反倾斜岩石边坡的动态响应模式和破坏机制。所采用的方法包括利用加速度放大系数(AAF)来比较两种斜坡在不同激励振幅下的放大效应。对加速度进行傅立叶频谱分析,以探讨地震波频率与边坡响应之间的关系。采用希尔伯特-黄变换(HHT)方法分析了倾角斜坡和反倾角斜坡的地震响应差异。结果表明,与倾角斜坡相比,反倾角斜坡表现出更高的稳定性,因为后者会更早发生破坏。研究还确定了临界激励烈度值("阈值点"),这表明了边坡动态响应的演变。研究结果表明,倾角斜坡受地震运动的影响更大,表现出更高的能量集中和释放。与反斜坡相比,地震波在倾斜斜坡中的传播也显示出更大的能量释放。这些结果将为地震活动频繁地区的斜坡工程设计和地震灾害风险评估提供有价值的启示。研究结果凸显了倾角斜坡崩塌风险的增加,并强调了在工程项目中考虑斜坡稳定性的重要性。本研究提出的方法以及确定的临界激励烈度值有助于理解和减轻与斜坡工程相关的潜在风险。
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来源期刊
Engineering Geology
Engineering Geology 地学-地球科学综合
CiteScore
13.70
自引率
12.20%
发文量
327
审稿时长
5.6 months
期刊介绍: Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.
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