考虑残余变形的台阶式岩质边坡震裂累积效应

doi:10.13722/j.cnki.jrme.2021.1250

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摘要高烈度地震区的岩质边坡内部节理裂隙较为发育，且分布随机性大。多期强震作用造成岩体结构进一步的破坏，形成震裂岩体边坡并继续发生变形破坏。因此，研究台阶式岩质边坡在多次强震作用下的震裂累积效应对于分析边坡的地震稳定性具有重要意义。通过大型振动台模型试验分析台阶式岩质边坡的动力位移响应状态，重点研究台阶式岩质边坡的震裂累积效应。通过基线偏移量表征边坡的残余变形，坡表发生的最终破坏是残余变形与激振动力变形共同作用的结果。提出用残余变形率分析台阶式岩质边坡的震裂累积效应，并利用阿里亚斯强度放大率验证残余变形率在分析强震造成岩质边坡出现震裂累积效应的适用性。结果表明：残余变形率充分考虑了持续的残余变形和地震动力的共同影响，能够更清楚地辨识边坡不同的地震动力破坏阶段、分析边坡的震裂累积效应。台阶式岩质边坡在地震动力作用下的变形破坏从局部开始，特别是台阶平台的内部折线处以及坡顶，均是最易萌生初始裂缝的部位。基于残余变形率和阿里亚斯强度能量的分析，边坡的震裂累积过程包含缓慢变形、加速变形和失稳破坏3个阶段。2种分析方法可以交互使用，实现更精准的边坡动态变形预测，为边坡的抗震设防方案提供可靠的依据。

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	冯文凯1
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	信春雷1
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	李文惠2
	杨飞2
	廖军1
	2

关键词 ：边坡工程, 台阶式岩质边坡, 振动台试验, 地震动位移响应, 残余变形, 震裂累积效应

Abstract：The rock slopes in high-intensity areas are developed with cracks and distributed randomly. The deformation damage of the rock slopes will occur when they evolve into shattered rock mass after suffering multiple phases of strong earthquake. Therefore，it is significant to explore the shattering cumulative effect of multiple phases of strong earthquake on the stability of the step-like rock slopes. In this paper，the shattering cumulative effect of the step-like rock slope was mainly researched via analyzing the dynamic displacement response of the step-like rock slope model，which was performed by means of the large-scale shaking table model test. The residual deformation was represented by the baseline offset，the ultimate failure on the surface of the slope model was induced by the mutual effect of residual deformation and dynamic deformation caused by seismic excitation. The shattering cumulative effect was analyzed via the proposed residual deformation ratio，and the application of this analysis method was verified by Arias-Intensity magnification. The results show that the residual deformation ratio can analyze the shattering cumulative effect of the slope more clearly，which sufficiently considers the mutual effect of the continuous residual deformation and seismic dynamic. The deformation and failure of the step-like rock slope start from local regions，in which the interior fold line of the step platform and the top of the step-like slope are the areas prone to develop with incipient cracks. Based on the analysis of residual deformation and Arias-Intensity energy，the shattering cumulative process of the slope is concluded in three steps，including slow deformation，accelerated deformation and unstable failure. These two methods can be alternately adopted in analyzing，helping achieve a more precise prediction of the dynamic deformation of the slope and presenting a more credible reference for the design of earthquake fortification scheme for slopes.

Key words： slope engineering step-like rock slope shaking table test seismic displacement response residual deformation shattering cumulative effect

引用本文:

冯文凯1，2，信春雷1，2，李文惠2，杨飞2，廖军1，2. 考虑残余变形的台阶式岩质边坡震裂累积效应[J]. 岩石力学与工程学报, 2022, 41(8): 1581-1594.
FENG Wenkai1，2，XIN Chunlei1，2，LI Wenhui2，YANG Fei2，LIAO Jun1，2. Seismic induced shattering cumulative effects on step-like bedding rock slopes with residual deformation features. , 2022, 41(8): 1581-1594.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1250 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I8/1581

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