静压开口管桩沉桩过程模型试验及数值模拟

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Abstract With the outstanding economic performance，open-ended jacked pipe piles have been widely used in engineering construction field，and plugging effects will be developed during the installation of open-end pipe piles，which have significant influence on the characteristics of pile while jacking into soil. The mechanism of soil plug formation and particles movement were analyzed by the meso-scale through physical model tests and numerical simulations. The container that consists of four steel sheets and one toughened glass side and aluminum semi-model pile were used to simulate the installation of open-end jacked pipe pile in sand. During the pile jacking into the sand，the courses of soil plug formation were observed from the transparent glass side and the processes can be divided into three stages，and the mechanisms of soil plug formation at three stages were revealed respectively. Based on the results of model test，the parameters of numerical model were determined by the biaxical test in PFC2D；and with the established numerical model and procedure in PFC2D，the driving process was simulated，which could consider both squeezing effects and plugging effects simultaneously. The behaviours of the numerical model are consistent with the results of physical model test. It indicates that PFC2D is capable of simulating the process for pile jacking into sand. In the research work，the courses of soil plug formation and displacement field of sand particles were analyzed. The particles within 5–7 times of particle diameters away from the ektexine of pipe pile will bring out large displacements and rotations，while beyond the thickness of 10–15 times of diameters，the particles will not be influenced almost. Furthermore，the analysis of porosity and contact numbers indicates that the bearing capacity of soil plug is mainly dependent on the lower part.

Key words： soil mechanics open-ended pipe piles plugging effects model test numerical simulation particle flow meso-scale

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	Articles by authors
	ZHOU Jian1
	2
	CHEN Xiaoliang1
	2
	ZHOU Kaimin1
	2
	WANG Guanying3

Cite this article:

ZHOU Jian1,2,CHEN Xiaoliang1, et al. MODEL TEST AND NUMERICAL SIMULATION OF DRIVING PROCESS OF OPEN-ENDED JACKED PIPE PILES[J]. , 2010, 29(S2): 3839-3846.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3839

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