陡倾顺层断裂带黄土–泥岩边坡动力响应振动台试验研究

doi:10.13722/j.cnki.jrme.2018.0719

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摘要以甘肃天水地区典型黄土–泥岩滑坡为原型，采用顺层倾角80°的断裂带黄土–泥岩边坡概念模型，通过输入峰值加速度逐级增大的地震波，设计并开展比例尺为1∶20的振动台模型试验，结合数值模拟，揭示陡倾顺层断裂带黄土–泥岩边坡地震动力响应规律以及失稳模式。研究结果表明：加速度动力响应在坡面处具有趋表效应，在断裂带处放大效应明显大于两侧地层；峰值加速度a = 0.3 g是边坡地震响应的临界点，断裂带上盘放大效应、竖向与水平向动土压力响应在此临界点上下的响应性状与特征不同，当a≤0.3 g时边坡断裂带上盘放大效应不明显，竖向动土压力响应与上覆地层厚度呈正相关，水平向动土压力响应在坡肩处最强烈，在断裂带处呈整体降低趋势，而当a＞0.3 g时边坡断裂带上盘放大效应显著，竖向动土压力受断裂带和上覆地层厚度共同控制，且坡脚处的地震响应强烈；地震作用下陡倾断裂带黄土–泥岩边坡失稳模式为震裂滑移式破坏，其中上盘震裂裂隙分布区范围是下盘的1.5倍，这是陡倾断裂带边坡具有一定的断裂带上盘放大效应的又一佐证。

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	贾向宁1
	黄强兵1
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	王涛3
	张宁1
	姜紫看1

关键词 ：边坡工程, 断裂带, 黄土&ndash, 泥岩边坡, 振动台试验, 数值模拟, 动力响应, 破坏特征

Abstract：Taking a typical loess-mudstone landslide in Tianshui city of Gansu Province as a prototype，using the conceptual model of the loess-mudstone slope with an 80°dip angle bedding fault zone and inputting different seismic waves with different peak accelerations，the shaking table test with a size similarity of 1∶20 was designed and completed. Based on the shaking table test and numerical simulation，the seismic dynamic responses and failure modes of loess-mudstone slopes with a steep dip bedding fault zone were revealed. The results show that the dynamic response of acceleration reflects an obvious surface effect and the amplification effect at the fault zone is greater than that of both side strata of the fault zone. The peak acceleration a = 0.3 g is the critical point of seismic responses of slopes，and the acceleration amplification effect at the hanging wall，the vertical and horizontal earth pressure responses are different while the peak acceleration is less or greater than 0.3 g. When the peak acceleration is less than or equal to 0.3 g，the amplification effect at the hanging wall is not obvious，the vertical earth pressure response is positively correlated with the thickness of the overburden strata，and the horizontal earth pressure response is strongest at the slope shoulder and has a decrease trend at fault zone. When the peak acceleration is greater than 0.3 g，the amplification effect at the hanging wall is very obvious，the vertical earth pressure response is controlled by both the fault zone and the thickness of the overburden strata，and the horizontal earth pressure response is strongest at the slope foot. The failure of loess-mud slopes with a steep dip bedding fault zone under the action of seismic waves is a shock slip failure mode and the width of the fracture distribution area in the loess-mud slope induced by seismic waves on the hanging wall is 1.5 times that of the footwall of the fault zone，which indicates that the slope with a steep dip fault zone has a certain amplification effect on the hanging wall of the fault zone.

Key words： slope engineering fault zone loess-mudstone slopes shaking table test numerical simulation dynamic response failure characteristics

引用本文:

贾向宁1，黄强兵1，2,王涛3，张宁1，姜紫看1. 陡倾顺层断裂带黄土–泥岩边坡动力响应振动台试验研究[J]. 岩石力学与工程学报, 2018, 37(12): 2721-2732.
JIA Xiangning1，HUANG Qiangbing1，2，WANG Tao3，ZHANG Ning1，JIANG Zikan1. Shaking table test of dynamic responses of loess-mudstone slopes with a steep dip bedding fault zone. , 2018, 37(12): 2721-2732.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0719 或 http://www.rockmech.org/CN/Y2018/V37/I12/2721

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