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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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

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	Articles by authors
	JIA Xiangning1
	HUANG Qiangbing1
	2
	WANG Tao3
	ZHANG Ning1
	JIANG Zikan1

Cite this article:

JIA Xiangning1,HUANG Qiangbing1,2, et al. Shaking table test of dynamic responses of loess-mudstone slopes with a steep dip bedding fault zone[J]. , 2018, 37(12): 2721-2732.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0719 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I12/2721

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