超大型沉井基础下沉中后期摩阻力特性及突沉机制研究

doi:10.13722/j.cnki.jrme.2019.0203

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Abstract According to the problems such as sinking lag，transient sudden sinking and so on of caisson foundations caused by the increasing frictional resistance in the middle and late period of sinking construction due to the increasing plane area，the theoretical formula of static and dynamical friction coefficients were proposed based on the theoretical study of the force composition of the bottom resistance，the friction resistance on the cutting edges and the lateral wall friction resistance during the sinking of the caisson. Taking the caisson foundation of Wufengshan Changjiang River Bridge as example，the friction resistance characteristics and the mechanism of the transient sudden sinking were investigated based on the measured data and the theoretical calculation results in the middle and late stages of sinking. The further control countermeasures of caisson sinking were analyzed. The results show that the lateral wall friction increases with the increasing sinking depth and accounts for more than 70% of the total resistance in the middle and late stage of sinking，which is regarded as the dominant factor of sinking stagnation. The force difference of instantaneous static and dynamical friction is the key factor causing the sudden sinking when the basement excavation is uneven and with local over excavation. The static and dynamical friction coefficients calculated from measured data of several cases of sudden sinking were between 0.444–0.525，0.245–0.401 respectively. And the dynamical friction coefficients were 0.56–0.77 times of corresponding static friction coefficients，which produced significant unbalanced force causing accelerative sinking of the caisson. The friction coefficient was effectively reduced to 0.225–0.325 with the sinking assistant methods such as air curtain，water level lowering，and the sinking coefficient was increased over 1.10，which are critical measures for avoiding sinking lag and sudden sinking of the caisson.

Key words： pile foundation caisson foundation sinking frictional resistance mechanism of transient sudden sinking coefficient of sliding friction sinking assistant methods

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	Articles by authors
	SHI Zhou1
	LI Siyang1
	YANG Shili1
	FENG Chuanbao2

Cite this article:

SHI Zhou1,LI Siyang1,YANG Shili1, et al. Study on the characteristics of friction resistance and the mechanism of sudden sinking in the middle and late sinking stages of super large caisson foundation [J]. , 2019, 38(S2): 3894-3904.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0203 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS2/3894

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