微型桩群桩支护滑坡的地震动力响应研究

doi:10.13722/j.cnki.jrme.2018.0237

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Abstract Shaking table tests were performed to model two landslides(micropiles reinforced landslide and unreinforced landslide). El Centro waves，Wenchuan waves，Kobe waves and sinusoidal waves with different frequencies were applied respectively. Acceleration response of landslides，dynamic earth pressure distribution in front and back of micropiles，the stress condition and failure mode of micropiles were monitored and analyzed respectively. The results indicate that micropiles have a good seismic performance for landslide，and it can suppress the seismic wave propagating through the landslide，especially at the toe of landslide，however，the suppression decreases with the height. For the dynamic earth pressure distribution in the back of micropiles，the pushing force of sliding mass and the resisting force of sliding bed is distributed triangularly(small at the upper part and large at the lower part). For the earth pressure distribution in front of micropiles，the resisting force of sliding mass and the pushing force of sliding bed is distributed triangularly(large at upper part and small at lower part). The peak bending moment of micropile shows an “M” shape. The maximum bending moment point is near the place 1.4 times of pile diameter above the sliding surface and 6.6 times of pile diameter below the sliding surface under earthquake，and the maximum bending moment point above the sliding surface moves up to the place 1.4 times of pile diameter with the increasing of loading amplitude. The failure characteristics of micropile after earthquake shows a reverse“S”shape，which is similar to that under static load conditions. The destruction area of micropile is distributed mainly in the place 1.4–4.0 times pile diameter above the sliding surface and 1.4–3.4 times pile diameter below the sliding surface.

Key words： slope engineering landslide micropile shaking table test dynamic response

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	LI Nan
	MEN Yuming
	GAO Ou
	LI Jian
	LIU Xueling

Cite this article:

LI Nan,MEN Yuming,GAO Ou, et al. Seismic behavior of the landslide supported by micropiles[J]. , 2018, 37(9): 2144-2151.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0237 OR http://www.rockmech.org/EN/Y2018/V37/I9/2144

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