摘要
为了掌握不同地震荷载作用下的边坡稳定性能,采用振动台试验并结合离散元数值模拟对典型反倾层状岩质边坡进行了分析,对地震作用下反倾层状岩质边坡的动力响应特性和变形破坏规律进行了研究。结果表明1)边坡的顶部和坡面首先出现变形,边坡开始出现层间错动导致最终彻底破坏;2)地震波频率对边坡的变形破坏有着显著影响,不同频率正弦波作用于边坡时,边坡上各个地方的加速度响应状况各不相同;3)在频率较小的正弦波作用下边坡的顶部及坡面浅表部松动变形,在频率较大的正弦波作用下边坡内部出现横向拉张裂缝,拉张裂缝会导致边坡的崩塌溃坏;4)在数值模拟分析边坡的加速度响应情况时,从边坡底部到顶部,随着高程的不断增加,其加速度放大系数增长幅度逐渐增加;5)地震波不仅影响边坡上监测点位加速度响应的大小,同时还对不同高程下其加速度响应变化情况产生影响。研究结果显示了边坡加速度响应数值模拟分析与振动台模型试验结果的一致性,所得结论对工程施工参数设计具有一定的借鉴价值。
In order to explore the slope stability under different seismic loads,the typical anti-dip layered rock slope was analyzed by shaking table test and discrete element numerical simulation,and the dynamic response characteristics and deformation and failure laws of anti-dip layered rock slope under earthquake were studied.The results show that:1)the top and surface of the slope deform at first,and the interlayer dislocation of the slope begins to appear,which leads to complete failure;2)the seismic wave frequency has a significant influence on the deformation and failure of the slope,and when sine waves with different frequencies act on the slope,the acceleration response varies from place to place;3)the loosening and deformation appear on the top and shallow part of the slope under the action of the sine wave with lower frequency,and the transverse tensile cracks appear inside the slope under the action of the sine wave with higher frequency,and the further development of the tension crack finally leads to the collapse of the slope;4)in the process of numerical simulation analysis of the acceleration response of the slope,the growth rate of acceleration amplification coefficient increases gradually with the increase of elevation from the slope bottom to the top;5)seismic wave not only affects the acceleration response of each point on the slope,but also affects the change of acceleration response at different elevations.The study shows that the numerical simulation analysis of slope acceleration response is consistent with the shaking table model test results,which has a certain practical significance for the design of construction parameters and the early design and construction of similar projects in the future.
作者
马文礼
刘赟
魏占玺
董顺德
MA Wenli;LIU Yun;WEI Zhanxi;DONG Shunde(Qinghai Bureau of Environmental Geology Exploration,Xining,Qinghai 810001,China;Qinghai Engineering Research Center of Geo-environment Protection and Disaster Prevention,Xining,Qinghai 810001,China;Key Laboratory of Environmental Geology of Qinghai Province,Xining,Qinghai 810001,China)
出处
《河北工业科技》
CAS
2020年第5期318-325,共8页
Hebei Journal of Industrial Science and Technology
关键词
地震学
地震荷载
反倾层状边坡
倾倒变形
加速度响应
数值分析
seismology
seismic load
anti-dip layered slope
toppling deformation
acceleration response
numerical analysis
