|Table of Contents|

Influence of Rock-socketed Characteristics on Torsional Dynamic Impedance at Head of Rock-socketed Pile(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年03期
Page:
55-65
Research Field:
Publishing date:

Info

Title:
Influence of Rock-socketed Characteristics on Torsional Dynamic Impedance at Head of Rock-socketed Pile
Author(s):
DENG Guo-dong
(China Southern Railway Construction Investment Co., Ltd CRCC, Shenzhen 518000, Guangdong, China)
Keywords:
rock-socketed pile;  torsional vibration;  complex impedance;  rock-socketed length;  sediment at pile end;  analytical solution
PACS:
TU473
DOI:
-
Abstract:
Considering the variation of the soil and the pile cross-section, the calculating model and governing equations of a rock-socketed pile embedded in layered soil were established when there was an arbitrary torsional dynamic force acting on the pile head. The analytical solution for torsional dynamic impedance at the pile head was derived by means of Laplace transform technique and impedance function transfer method. The rationality of the present solution was also verified by comparing with existing solution. Based on the presented solution, the influence of geometrical properties of the rock-socketed pile, the sediment at pile end and the property of surrounding rock on the torsional dynamic impedance of the pile head were investigated within a lower frequency range. The result shows that there is a critical rock-socketed influence depth of rock-socketed pile under the torsional dynamic loading condition, and the critical rock-socketed influence depth decreases with the increase of the length-radius ratio of pile and the shear velocity of rock. This shows that the deeper the rock-socketed depth is not necessarily beneficial to the whole pile-soil system during the engineering design. Within the critical influence depth, the torsional dynamic stiffness decreases with the increase of rock-socketed length, but the torsional dynamic damping increases as the rock-socketed length increases. If the rock-socketed length is beyond the critical influence depth, the influence of rock-socketed on the torsional dynamic response of pile can be ignored. Within the critical influence depth, the sediment can lead to the decrease of the torsional dynamic stiffness along with the increase of the torsional dynamic impedance. If the rock-socketed length is beyond the critical influence depth, the influence of sediment on the torsional dynamic response of pile can be neglected. The pile radius is a major factor for the torsional dynamic impedance of the rock-socketed pile.

References:


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Last Update: 2019-05-23