爆破震动作用下斜坡体的地震动分布及其动应力响应特征

doi:10.13722/j.cnki.jrme.2014.s2.039

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Abstract According to the seismic records，ground motion parameters are significant difference on various parts of alpine and gorge region，where earthquake damage investigation shows the damage is more serious than wide flat terrain and secondary disaster occurs frequently. In order to reveal the mechanisms of action，characteristics of blasting ground motion and the corresponding dynamic stress response，the blasting ground motion test for a loess valley slope located in Gaolan County，Lanzhou is carried. The testing analysis shows that：(1) Ground motion on the slope is obviously controlled by topography，especially in the cove(QZH14) on upper part of slope，where the PGA is higher than nearby observation points due to the wave superposition. (2) The response spectrum of blasting shows two attributes of ground motion on the slope and the foot of valley-bimodal pattern the former and unimodal pattern the latter. On the slope，long period component attenuates slowly with the hypocentral distance increasing. (3) There is a apparent correspondence between ground motion and its dynamic stress response，higher amplitude of ground motion，larger dynamic stress response. Due to the topographic effect and the geotechnical structure，inner stress response of the slope emerges significant variation in different depths rather than increasing or reducing trend with the distance of macro-epicenter increase. It suggests that the development degree of earthquake induced geological disasters are affected by the parameter variation of strong ground motion on the slope，which is usually determined by various factors，amplitude，frequency characteristics and incidence angle of seismic wave etc.

Key words： slope engineering blasting source ground motion dynamic stress response topographic effect seismic response spectrum

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	Articles by authors
	SHI Yucheng1
	2
	3
	LU Yuxia1
	2
	3
	HE Shaolin1
	SUN Junjie1
	2
	3
	LIU Xingwang1
	LIU Kun1
	2
	3

Cite this article:

SHI Yucheng1,2,3, et al. DISTRIBUTION CHARACTERISTICS OF GROUND MOTION AND DYNAMIC STRESS RESPONSE OF VALLEY SLOPES UNDER BLASTING LOADING[J]. , 2014, 33(S2): 3707-3717.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.039 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/3707

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