考虑时间间歇效应的地铁列车荷载下海相软土长期动力特性试验研究

doi:10.13722/j.cnki.jrme.2018.0720

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Abstract Soft soil foundations are repeatedly subjected to periodic vibration and time intermittence during the subway operation period. The mechanical characteristics of soft soils in intermittent periods will affect their long-term dynamic characteristics，but most of previous researches on the dynamic characteristics of soft soils under traffic loads neglected the effect of time intermittence. Considering different dynamic stress levels and coupling effects of different vibration times and intermittence times，a series of undrained continuous-stopping vibration triaxial tests were designed to study the long-term pore pressure and deformation characteristics of the undisturbed K0 consolidated marine soft clay under uncontinuous subway loads. By comparing with the continuous vibration tests，it was found that the intermittence has a significant effect on the dynamic characteristics of the soft soil. Due to the change of the dynamic characteristics during the intermittent period，the maximum residual pore pressure and strain of the soft soil after loading stabilization decrease obviously，and the number of vibrations required to stabilize the pore pressure and the strain decreases while the time increases. Based on the test results，the mechanism of time interval effect and the influence of intermittence time on dynamic characteristics of soft soil were analyzed in depth. It is shown that the further adjustment of the internal structure of the soft soil during the intermittent period reduces the elastic aftereffect pore pressure and the strain that fail to recover in time during the vibration period，and that the partial pore pressure and the strain repeatedly occur in the vibration period，which makes the calculated residual pore pressure and strain are far greater than those resulted from the continuous vibration. Under the same condition，the longer the intermittence time is，the greater the pore pressure and the strain response of the soft soil are weakened，the smaller the maximum residual pore pressure and the strain are，and the longer the time required to enter a stable period. This study has a positive significance for calculating the long-term settlement of soft soil foundations under subway loads.

Key words： soil mechanics subway train loads time intermittent effect undisturbed marine soft soils long-term dynamic characteristics

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	Articles by authors
	HE Shaoheng1
	ZHENG Qingqing1
	XIA Tangdai1
	GAN Xiaolu1
	SHAN Huafeng2

Cite this article:

HE Shaoheng1,ZHENG Qingqing1,XIA Tangdai1, et al. Experimental study on long-term dynamic characteristics of marine soft soils under metro train loads considering time intermittent effect[J]. , 2019, 38(2): 353-364.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0720 OR http://www.rockmech.org/EN/Y2019/V38/I2/353

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