A Probabilistic Investigation of Primary Consolidation Settlements of Subsea Structures

2017 ◽  
pp. 764-771
Author(s):  
MF Silva ◽  
L Begaj ◽  
A Amodio
Keyword(s):  
Primary Consolidation

TIME TO THE END OF PRIMARY CONSOLIDATION (EOP) OF SOFT CLAYEY SOILS: CONCERNING THE EFFECT OF ATTERBERG’S LIMIT AND CYCLIC LOADING HISTORY

2019 ◽  
Vol 128 (2B) ◽  
pp. 29-41
Author(s):  
Trần Thanh Nhàn
Keyword(s):  
Cyclic Loading ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Clayey Soils ◽  
Loading History ◽  
Cyclic Shear ◽  
Wide Range ◽  
Primary Consolidation ◽  
Time Required

In order to observe the end of primary consolidation (EOP) of cohesive soils with and without subjecting to cyclic loading, reconstituted specimens of clayey soils at various Atterberg’s limits were used for oedometer test at different loading increments and undrained cyclic shear test followed by drainage with various cyclic shear directions and a wide range of shear strain amplitudes. The pore water pressure and settlement of the soils were measured with time and the time to EOP was then determined by different methods. It is shown from observed results that the time to EOP determined by 3-t method agrees well with the time required for full dissipation of the pore water pressure and being considerably larger than those determined by Log Time method. These observations were then further evaluated in connection with effects of the Atterberg’s limit and the cyclic loading history.

scholarly journals Influence of load increment ratio on one-dimensional consolidation behaviour

2018 ◽  
Vol 192 ◽  
pp. 02029
Author(s):  
Takahiro Yoshidomi ◽  
Koichi Iinuma ◽  
Motohiro Sugiyama
Keyword(s):  
Time Curve ◽  
Load Increment ◽  
One Dimensional ◽  
Consolidation Test ◽  
Primary Consolidation ◽  
Consolidation Analysis ◽  
Increment Ratio ◽  
Load Increment Ratio

In this study, we conducted a stage loading consolidation test with varying load increment ratio and investigated its effect. By adjusting the primary consolidation ratio of one-dimensional consolidation analysis with secondary consolidation taken into account, it is possible to reproduce the consolidation amount-time curve affected by the load increment ratio.

scholarly journals Rate of Subsidence Due to Primary Consolidation on Cileles Village, Jatinangor Subdistrict

2018 ◽  
Vol 145 ◽  
pp. 012136
Author(s):  
Y Faizah ◽  
R I Sophia ◽  
A Mulyo ◽  
H Hendramawan
Keyword(s):  
Primary Consolidation

scholarly journals Creep in Primary Consolidation with Rate of Loading Approach

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Gang Bi ◽  
Shuna Ni ◽  
Dong Wang ◽  
Yeqiang Chen ◽  
Jianfei Wei ◽  
...  
Keyword(s):  
Primary Consolidation ◽  
Rate Of Loading

Consolidation Properties of Dredger Fill over Liquid Limit under Different Back Pressure Levels

2012 ◽  
Vol 594-597 ◽  
pp. 213-217
Author(s):  
Yang Shen ◽  
Zhon Qiu Fei
Keyword(s):  
Moisture Content ◽  
Pore Pressure ◽  
Liquid Limit ◽  
Back Pressure ◽  
High Moisture Content ◽  
High Moisture ◽  
Vertical Loading ◽  
Consolidation Pressure ◽  
Primary Consolidation ◽  
Dredger Fill

Primary and secondary consolidation concur in the primary consolidation stage. Especially for the dredger fill with high moisture content, the coupling effect of primary and secondary consolidation was very obvious. Analysis on the secondary consolidation properties during primary consolidation is great significant to reveal the consolidation mechanism and identify the settlement calculation method. Therefore one dimensional consolidation tests were conducted with the dredger fill clay of Wenzhou over liquid limit. The tests were focused on the influence of different vertical loading and back pressure condition on soil’s secondary consolidation properties. The research showed that the secondary consolidation of dredger fill of in high moisture content was very obvious under the primary consolidation stage. The final consolidation pressure level was higher, the vertical deformation was larger at the same effective stress level. Through the consolidation tests with different back pressure levels, it further verified high pore pressure potential promoted the development of secondary consolidation. Further more, when the final consolidation pressure was a constant value, the total settlement of primary and secondary consolidation basically unchanged. So high pore pressure promoted the occurrence of secondary consolidation, but reduced and sped up the development of primary consolidation.

scholarly journals Settlement Analysis of a Confined Sand Aquifer Overlain by a Clay Layer due to Single Well Pumping

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Wen-jie Niu ◽  
Zhenyu Wang ◽  
Feng Chen ◽  
Hongran Li
Keyword(s):  
Analytical Solution ◽  
Confining Pressure ◽  
Vertical Force ◽  
Clay Layer ◽  
Sand Aquifer ◽  
Consolidation Settlement ◽  
Single Well ◽  
Primary Consolidation ◽  
Pudong New Area ◽  
3D Finite Element Method

This paper proposes a simplified analytical solution to determine the primary consolidation settlement of a confined sand aquifer overlain by a clay layer due to single well dewatering. After single well pumping in a steady state, the Dupuit equation predicts the confined sand aquifer water head drawdown. The confining pressure on the underlain confined sand aquifer top surface is determined using the principle of vertical force equilibrium. Additional vertical stresses in each layer of the confined sand aquifer are then computed with the Boussinesq solution. The overall aquifer consolidation deformation is then determined with thee-lgpcurve from the one-dimensional consolidation test and the applied vertical stress with the integral method. The proposed analytical solution is validated using the ADINA software, where porous media are simulated with the Biot model and solved with the 3D finite element method. This proposed analytical solution is used to simulate the primary consolidation settlement due to well pumping, using the fourth confined aquifer in the Pudong New Area of Shanghai from 1980 to 1995 as a case study. The predicted settlement compares reasonably well with the actual measured settlement in Shanghai.

scholarly journals CONSOLIDATION OF DISTURBED AND UNDISTURBED CLAY AND DIFFERENTIAL SETTLEMENT OF BUILDINGS

1999 ◽  
Vol 5 (1) ◽  
pp. 36-46
Author(s):  
Antanas Alikonis
Keyword(s):  
Pore Pressure ◽  
Theoretical Calculations ◽  
Differential Settlement ◽  
Additional Stress ◽  
Logarithmic Scale ◽  
Undisturbed Soil ◽  
Disturbed Soil ◽  
Preconsolidation Pressure ◽  
Consolidation Rate ◽  
Primary Consolidation

Differential settlement of foundations stimulates the development of cracks in structures. However different rate of settlements could be the reason of cracks. The highest rate of settlement takes place during the consolidation period. Theoretical calculations and experimental data showed that rate of settlement of disturbed soil is higher in comparison with undisturbed soil. During the loading of undisturbed soil with structural links displacement of particles and pore pressure dissipation are slower. Pore pressure dissipation begins only after the structural links are broken, ie after the additional stress becomes higher than preconsolidation pressure. The process of disintegration of structural links is slow, therefore the rate of consolidation settlement is also slow. If there are zones of disturbed clay within the layout of building, differential settlement of building can occur. Parameters which are necessary for estimation of the primary consolidation rate of disturbed soil could be calculated using compression curve of the same soil drawn in the semi-logarithmic scale. According to the results of investigations the method described above could be used to predict the rate of primary consolidation of foundations.

Sign in / Sign up

Export Citation Format

Share Document