Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 22 for “"Preconsolidation"”.
-
Land Rebound and Preconsolidation Head in the Houston Ship Channel Area
… the change from land subsidence to land rebound, preconsolidation heads, which indicate the threshold between elastic and inelastic deformation, should be taken into consideration. In areas experiencing land subsidence, subsidence will tend to continue, even after groundwater recharge has begun, …
-
Evolution of Preconsolidation Pressure of Normally Consolidated Clays Over Full Temperature Range
… been established that temperature can change the preconsolidation pressure of clays, the current understanding is limited to specific ranges of temperatures, with temperatures above freezing being studied entirely independently of temperatures below freezing. However, as temperature is a …
-
The effects of sample disturbance on preconsolidation pressure for normally consolidated and overconsolidated clays
… review of the methods available to estimate preconsolidation pressure and sample quality. It focuses on multiple disturbance-simulation triaxial tests on resedimented San Francisco Bay Mud (RSFBM) specimens. The effect of different ISA disturbance amplitudes (Baligh et al. 1987) on the …
-
Determinação dos parâmetros de resistência, "Creep" e de Relaxação de Tensões de uma argila mole do Rio de Janeiro
… and these of "Santos" and the effect of the preconsolidation pressure is analysed. The stress-strain curves of the triaxial tests are represented by the hyperbolic formula. The strength and stress-strain parametersare determined and compared with those of other clays. The results of triaxial …
-
The meaning and practical significance of the cohesion intercept in soil mechanics
… fraction of 2-93% and, activity of 0.1-9.6. The preconsolidation pressure ranges from a low of 44 kPa to a high of 14000 kPa. The values of c$\sp\prime$ have been correlated to both the stress history and plasticity index of the soil.
-
A theory for the time dependent yielding and creep of clay
… and the "aging" effect, or increase in preconsolidation pressure with time under sustained load. The theory appears to be consistent with many aspects of the consolidation behavior of real clays, including: (1) secondary compression, (2) aging, (3) different values of Cv determined by …
-
One Dimensional Computer Analysis of Simultaneous Consolidation and Creep of Clay
… relationships, and the effect of strain rate on preconsolidation stress observed in the laboratory and in the field. Validation of the computer program by simulating standard oedometer tests is described and the applicability of the program in predicting field behavior is examined. The oedometer …
-
A comparison of the behavior of intact and Resedimented Boston Blue Clay (BBC)
… of consolidation, lateral stress ratio, preconsolidation pressure and peak friction angle of RBBC were within ranges for intact BBC. Ranges for secant friction angle, swell ratio and undrained strength for intact BBC overlapped and were lower than ranges reported for RBBC. Both intact and …
-
Reanalysis of the settlement of a levee on soft bay mud
… test programs to develop well-defined values of preconsolidation stress (s'p) and compressibility parameters for the Bay Mud. However, conventional 1-D consolidation analyses greatly underestimated the measured levee settlements. Hence URS reduced s'p by 20% for the Plaxis FE analyses with the …
-
Characterization of consolidation and creep properties of Salt Lake City clays
… loading also provides more reliable estimates of preconsolidation stress ([sigma]'p). Data from 19 oedometer tests show that Ca/CR increases with increasing natural water content and has a mean value of about 0.042. The thesis presents correlations for predicting the reduction in creep rate of SLC …
-
Geotechnical characterization of sediments from Hydrate Ridge, Cascadia Continental Margin
… of the strain energy method yielded high preconsolidation pressures that indicate the soil is normal to overconsolidated (1<OCR<8). An alternative method used to estimate the pre-consolidation stress based on extrapolation of the virgin consolidation curve to the in-situ void ratio …
-
A constitutive model for the compression behavior of Old Alluvium
… to the Cation Exchange Capacity through the preconsolidation stress level, and hence, can accommodate changes in the clay swelling potential caused by mechanical or physicochemical loading. The model parameters depend on the compression characteristics of the intact soil, on measurements of …
-
Shear and consolidation behavior of slurry-deposited, desiccated tailings and compacted filtered tailings
… tests yielded a trend of increasing preconsolidation pressure with decreasing initial void ratio for both the desiccated and filtered tailings. There were slightly higher average compression and recompression indexes computed for the desiccated tailings relative to the filtered …
-
Stiffness characterization of mechanically-compressed cohesive soils using wave propagation
… data based on the concept of apparent preconsolidation pressure. Finally, the dynamically-obtained stiffness parameters are compared to statically-obtained constrained modulus values from static compression. By using Gassmann's fluid substitution and a corrective X factor, a new …
-
Geotechnical performance using alkaline activated fly ash for soil mixtures with and without polypropylene fibers
… Finally, the compression index and the preconsolidation pressure exhibited a substantial decrease and increase at 0.043, 0.076, 0.047, 0.104 and 900 kPa, 400 kPa, 500 kPa, 240 kPa for S1F40, S1FR0.75, S2F40 and S2FR0.75 respectively. It is to conclude, that the proposed new technique has …
-
The application of critical state soil mechanics to predict ground deformations below an embankment constructed on soft alluvium
… methods of determining the yield stress or preconsolidation pressure are shown to be inadequate when used to analyse the results of compression tests performed at a constant rate of loading. An alternative method, the Lambda construction, is proposed and this is shown to be both reliable and …
-
Current Ground Motions Along the Long-Point Fault Derived from Continuous GPS Observations (2012-2014)
… since 2000, but are still below the regional preconsolidation of ~30 m below the ground surface, contributing to the subsidence observed. While correlation between seasonal vertical movement and groundwater level change exists, a longer period of continuous GPS observations will be able to …
-
GPS Monitoring and Land Subsidence in the Houston Metropolitan Area
… Evangeline aquifers have been restored to the preconsolidation head and have remained stable for over two decades. In order to evaluate the contribution of petroleum withdrawal to the local subsidence, 3,570 petroleum wells across 457 leases and 217 fields within Galveston County were …
-
Engineering properties and behavior of silty soils
… developed modified energy method for determining preconsolidation pressure (sigma′p) with sigma′p/sigma′v0 in the range of 1 to 3, allowing consistent assessment of yield behavior from incremental loading tests even in the absence of a clear breakpoint between recompression and compression range. …
-
A Regional Study on Champlain Sea Clay: Empirical Prediction of Consolidation Parameters and Statistical Characterization of Undrained Shear Strength Based on Historical Geotechnical Data
… index (C_r), overconsolidation ratio (OCR), and preconsolidation pressure (σ_P^') that are tailored for eastern and western subregions of the Ottawa Valley. The field data from VSTs were compiled into a separate database to analyze the spatial and depth-related variability of S_u across the …
Page 1 of 2