采动地表土体沉陷对桥梁桩基影响试验研究

doi:10.13722/j.cnki.jrme.2017.0331

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Abstract

Surface subsidence induced by mining has seriously harmed pile foundation of high or railway bridge，and even causes instability and failure of the whole bridge. Based on the surface subsidence law subjected to mining and the principle of Probability Integral Method(PIM) prediction，a set of pile foundation load test system was developed，which could simulate surface subsidence induced by mining. Using this test system，four model piles located at different subsidence positions were carried out to study the bearing characteristics of existing load piles of bridge in the process of surface subsidence. Pile shaft force，side resistance and pile-soil relative displacement were obtained through the pre-set test elements. Test results show that the measured surface settlement has a good match with the calculation of PIM，which confirms the reliability of the test system to simulate mining surface subsidence. The variation of shaft force and the side resistance of four test piles are related to the location of surface subsidence curvature. The greater variation of the surface subsidence curvature，the greater change shaft force and the side resistance are. The relative displacement analysis of the pile-soil shows that the larger the surface subsidence curvature is，the larger the relative displacement of the pile-soil is，and the negative skin friction of the pile would generate，which will aggravate the pile foundation settlement and cause the upper bridge structure to produce uneven settlement，or even damage. The study results will be helpful to protect and reinforce bridge pile foundations in mining area.

Key words： foundation engineering mining-induced surface subsidence bridge piles model test load transfer mechanism pile-soil interaction

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	Articles by authors
	ZHANG Minxia
	XU Ping
	GAO Shuai
	CUI Wenjie

Cite this article:

ZHANG Minxia,XU Ping,GAO Shuai, et al. Experimental study on mining-induced surface subsidence influence on the pile foundation of bridge[J]. , 2017, 36(S2): 4122-4133.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0331 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/4122

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