Strain-Rate and Temperature Dependency for Preconsolidation Pressure of Soft Clay

2018 ◽  
pp. 39-42
Author(s):  
Ting Li ◽  
Qi-Yin Zhu ◽  
Lian-Fei Kuang ◽  
Li Gang
Keyword(s):  
Strain Rate ◽  
Soft Clay ◽  
Temperature Dependency ◽  
Preconsolidation Pressure

Determining Preconsolidation Pressure of the Lakeside New District Soft Clay of Hefei Based on Casagrande Method by Matlab

2013 ◽  
Vol 291-294 ◽  
pp. 1113-1116
Author(s):  
Yan Shao ◽  
Chang Yong Li ◽  
Yuan Wei
Keyword(s):  
Soft Clay ◽  
Least Square Method ◽  
Least Square ◽  
Compression Curve ◽  
Stress History ◽  
Important Index ◽  
Preconsolidation Pressure ◽  
Quartic Polynomial ◽  
History Of ◽  
Calculation Parameter

The preconsolidation pressure is an important index to determine the stress history of soil and also a major calculation parameter for the analysis of soil stratum’s deformation in the different stress history. Casagrade method is worldwide applied to determine the preconsolidation pressure. On the basis of research on consolidation test about the lakeside new district soft clay of Hefei by high pressure consolidation apparatus, and conformed to Casagrande method, the paper adopts quartic polynomial and least square method to fit the compression curve, and the preconsolidation pressure of the lakeside new distract soft clay of Hefei is determined by matlab software. The result provides reference for the calculation of foundation settlement considering stress history.

Numerical Simulation on the Dynamic Installation of the OMNI-Max Anchors in Clay Using a Fluid Dynamic Approach

2017 ◽  
Author(s):  
Jun Liu ◽  
Yuqin Zhang
Keyword(s):  
Strain Rate ◽  
Shear Strain ◽  
Penetration Depth ◽  
Impact Velocity ◽  
Fluid Dynamic ◽  
Soft Clay ◽  
Shear Strain Rate ◽  
Ansys Cfx ◽  
Wide Range ◽  
Penetration Depths

The OMNI-Max anchors, which are used as foundations for mooring deep-water offshore facilities, are raised recent years for their dynamically installation. ANSYS CFX 17.0 is a computational fluid dynamic (CFD) program, capable of simulating the dynamically installation process of the OMNI-Max anchor. In the simulation, soft clay with linearly increasing shear strength is modeled as Eulerian fluid material. The clay is subjected to high shear strain rate during the dynamical installation procedure, hence the H-B model is proposed as it is applicable to a wide range of shear strain rate. Different anchor impact velocity levels are modeled to investigate their effects on the anchor final penetration depths. To improve the anchor impact velocity and final penetration depth, a booster, which is retrievable and renewable, is attached to the tail of the anchor. The results demonstrate that the anchor would achieve deeper penetration depth with the increase in impact velocity. Also the anchor with a booster could reach a deeper penetration depth than that of the single anchor owing to the increase of the anchor total energy.

scholarly journals Stress-strain curve of pure aluminum in a super large strain range with strain rate and temperature dependency

2017 ◽  
Vol 207 ◽  
pp. 161-166 ◽  
Author(s):  
Yasuhiro Yogo ◽  
Masatoshi Sawamura ◽  
Risa Harada ◽  
Kosei Miyata ◽  
Noritoshi Iwata ◽  
...  
Keyword(s):  
Strain Rate ◽  
Large Strain ◽  
Pure Aluminum ◽  
Strain Curve ◽  
Strain Range ◽  
Temperature Dependency ◽  
Stress Strain Curve ◽  
Stress Strain

Modeling the viscoplastic behaviour of clays during consolidation: application to Berthierville clay in both laboratory and field conditions

2001 ◽  
Vol 38 (3) ◽  
pp. 484-497 ◽  
Author(s):  
Yun Tae Kim ◽  
S Leroueil
Keyword(s):  
Strain Rate ◽  
Effective Stress ◽  
Soft Clay ◽  
Field Conditions ◽  
Combined Processes ◽  
Natural Clay ◽  
Viscoplastic Strain ◽  
Proposed Model ◽  
The Difference ◽  
Predicted Values

To analyze the effects of strain rate and viscoplastic strain on consolidation of natural clay, this paper presents a nonlinear viscoplastic model in which viscoplastic behaviour is modeled by a unique effective stress (σ'v) – viscous strain (εv) – viscous strain rate (ε·v) relationship. The proposed model can consider the effects of strain rate and viscoplastic strain on consolidation, to take into account the difference in strain rate between laboratory and field conditions, and the combined processes of generation and dissipation of pore pressure during consolidation. This model can also predict the behaviour of clay during stepwise loading, constant rate of strain, and relaxation of effective stress. The predicted values using numerical analysis are compared with measured values in laboratory tests and in situ, under an embankment built on soft clay at Berthierville, Quebec. It is possible to estimate the consolidation behaviour of natural clay with reasonable accuracy using the proposed nonlinear viscoplastic model.Key words: consolidation, soft clay, strain rate, viscoplastic, relaxation.

Constant rate of strain consolidation testing of soft clays and fibrous peats

2019 ◽  
Vol 56 (10) ◽  
pp. 1526-1533
Author(s):  
Gholamreza Mesri ◽  
Tao-Wei Feng
Keyword(s):  
Strain Rate ◽  
Flow Equation ◽  
Test Duration ◽  
Soft Clays ◽  
Vertical Strain ◽  
Empirical Correction ◽  
Preconsolidation Pressure ◽  
Constant Rate ◽  
Specimen Quality ◽  
Incremental Loading

The constant rate of strain (CRS) oedometer test, using an imposed vertical strain rate [Formula: see text] equal to 10 times the end-of-primary (EOP) vertical strain rate [Formula: see text], requiring a test duration of about 2 days produces reliable information on both the e versus log[Formula: see text] relation and e versus logkv relation of soft clays and fibrous peats. An empirical correction for the strain rate effect on preconsolidation pressure leads to the EOP e versus log[Formula: see text] relation and EOP [Formula: see text]. The imposed vertical strain rate [Formula: see text] produces excess pore-water pressures at the impervious bottom of the specimen, corresponding to [Formula: see text] values in the range of 3%–15% and allows, use of the Darcy flow equation, a reliable calculation of the coefficient of permeability. Compressibility and permeability data are from CRS and incremental loading (IL) oedometer tests on specimen quality designation (SQD) A samples of seven soft clays and two fibrous peats are presented in this paper.

Sign in / Sign up

Export Citation Format

Share Document