基于光纤传感技术的泥岩地基动力打入桩施工效应现场试验

doi:10.13722/j.cnki.jrme.2022.0380

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Abstract In order to discuss the construction effect and bearing capacity abnormality of dynamic driven pile in mudstone foundation，the stress and end resistance of pile were monitored based on low temperature sensitive fiber optic strain sensor and full section spoke pressure sensor of pile end. The variation of internal force and end resistance of test pile with penetration depth was clarified. The bearing characteristics of each test pile were analyzed by vertical compressive static load and high strain variation measurement. The influence of hammer energy on the driving effect of prefabricated piles was studied by using hammer number and hammer weight. The influence mechanism of dynamic pile driving on the strength of mudstone around pile was revealed by means of the distribution of hammer number of standard penetration test of pile edge before and after pile driving. The test results show that the time-history curve of the end resistance measured by different sensors is consistent during the pile driving process. The ultimate bearing capacity of test pile obtained from static load test is higher than that obtained from variable test，and all test piles show the characteristics of end bearing pile. The strain variation range of heavy hammer driving pile is obviously larger，and the pile driving energy is related to the vertical bearing capacity of pile. High energy driving pile will lead to aggravated damage of mudstone structure and reduce the bearing capacity of driven pile. Compared with before pile driving，the hammer number of mudstone around pile after pile driving decreases obviously，which indicates that dynamic pile driving causes damage to mudstone structure around pile to different degrees in macro view. It can be considered that mudstone structure damage is one of the main reasons for the reduction of dynamic drive pile bearing capacity.

Key words： pile foundations driven pile piling hammering number mudstone static load test high strain standard penetration test fiber optic sensing technology

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	Articles by authors
	ZHANG Yamei1
	2
	SUN Gan1
	2
	BAI Xiaoyu1
	2
	YAN Nan1
	2
	WANG Yonghong1
	2
	YU Longtao3

Cite this article:

ZHANG Yamei1,2,SUN Gan1, et al. Field test of construction effect of dynamic driven pile in mudstone foundation based on fiber optic sensing technology[J]. , 2023, 42(S1): 3731-3742.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0380 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3731

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