悬臂挡墙–微型桩加固填土边坡地震响应特征研究

doi:10.13722/j.cnki.jrme.2021.1300

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Abstract As a retaining structure suitable for seismic areas，cantilever retaining walls(CRWs) are widely used，at the back of which backfills show a certain slope angle. Many problems(such as how to determine the level and point of action of the seismic earth pressure，displacement and deformation and failure mode) still occur during seismic design of retaining walls. Moreover，micropiles with favourable seismic behaviours have been extensively used in the fields of controlling shallow landslides and reinforcing slopes. Research on mechanical characteristics，load and deformation accumulation of micropiles under the lateral dynamic load remains sparse. To this end，the seismic response characteristics of a micropile-reinforced cut slope behind a CRW under multistage continuous earthquake loadings were studied by means of a centrifuge shaking-table model test. At the same time，the typical shaking event is numerically simulated. The seismic response characteristics of the slope system supported by micropiles and CRWs were analyzed and discussed from three aspects of seismic acceleration response of the slope and the settlement and deformation of the slope crest，seismic response of the micropiles and distribution of bending moment on the piles，and the level and point of action of the dynamic earth pressure，the bending moment and the influence of the bending moment of inertia generated by the self-weight of CRWs，displacement and deformation mode during an earthquake and cumulative development of the residual bending moment. A transfer-function analysis of the input and output accelerations shows that the slope soil has a significant acceleration amplification effect on the frequency components of the input seismic waves approaching their natural frequency. It is necessary to set the rigid connected beams on the upper part of the micropile structure，which is able to improve the mechanical performance of micropiles. Due to the flexibility and ductility of micropiles，more energy can be dissipated under the effect of seismic load. The bending moment of inertia on the CRWs cannot be ignored because it exceeds 22% of the dynamic bending moment. When there is a large slope angle of backfill，and loads are applied to the upper part of the slope crest，the dynamic earth pressure coefficient ΔKae is much larger than that when the backfill is flat and no additional loads are applied. In addition，the significant residual bending moment is accumulated on CRWs and micropiles after earthquakes，which needs to be considered during the seismic design of retaining structures.

Key words： slope engineering dynamic centrifuge test dynamic earth pressure cantilever retaining wall micropile；dynamic earth pressure coefficient residual bending moment

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	Articles by authors
	SUN Zhiliang1
	KONG Lingwei1
	2
	WANG Yong1
	ZHOU Zhenhua1
	2

Cite this article:

SUN Zhiliang1,KONG Lingwei1,2, et al. Study on seismic response characteristics of a micropile-reinforced filled slope behind a cantilever retaining wall[J]. , 2022, 41(10): 2109-2123.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1300 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I10/2109

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