|Table of Contents|

Elastic Visco-plastic Consolidation Analysis of Foundation with Ideal Sand Drains Under Construction Load(PDF)

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

Issue:
2020年03期
Page:
118-126
Research Field:
Publishing date:

Info

Title:
Elastic Visco-plastic Consolidation Analysis of Foundation with Ideal Sand Drains Under Construction Load
Author(s):
LIU Zhong-yu;  FAN Zhi-cheng;  ZHU Xin-mu;  CUI Peng-lu
(School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China)
Keywords:
soil mechanics;  saturated clay;  ideal sand drain;  rheological consolidation;  construction load;  elastic visco-plasticity;  pore water pressure
PACS:
TU431
DOI:
10.19815/j.jace.2019.03043
Abstract:
In order to further study the rheological properties of saturated clay and the influence of construction load on the consolidation properties of ideal sand drain foundation, based on the basic assumption of Barron's ideal sand drain consolidation theory, a unified hardening(UH)constitutive model considering time effect was introduced to describe the elastic visco-plastic deformation of saturated clay. At the same time, the construction load was simplified as linear load, the consolidation equation of ideal sand drain was derived again, and the implicit difference scheme of the consolidation equation was given. Compared with the analytical solution of the nonlinear consolidation equation of sand drain foundation under variable load in the literature, the validity of the research method was verified. The influence of construction load and UH model parameters on consolidation process of sand drain foundation was discussed. The results show that the increase of pore pressure in sand drain foundation during construction is not only caused by the increase of construction load with time, but also by the viscosity of clay. Prolonging the construction period and increasing the parameters of UH model will prolong the dissipation time of pore water pressure and reduce the consolidation rate. When the construction period is long, the calculation of the consolidation process of the sand drain foundation under the condition of instantaneous loading will produce large errors, and neglecting the viscosity of soil will overestimate the consolidation rate of sand drain foundation.

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Last Update: 2020-06-08