The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform

Lei Huayan - One of the best experts on this subject based on the ideXlab platform.

  • Consolidation PROPERTY OF ULTRA SOFT SOIL
    2020
    Co-Authors: Lei Huayan
    Abstract:

    This paper determines the Consolidation characteristics and the influence of water content and load ratio on the coefficient of Secondary Consolidation of hydraulic fill ultra soft soil in Tianjin. A series of step-loading Consolidation tests are performed on both ultra soft soil and remolded specimens using a modified oedometer with low applied stress and the ordinary oedometer. The results show that the coefficient of Consolidation of the remolded specimens increases with the increasing Consolidation pressure. But the ultra soft soil has a"S "shape of Cv-lgp curves. This"S"shape involves two parts divided by the Consolidation yield stress( 16 k Pa). The one prior to the yield stress is responsible for concave increase while the other after the yield stress is responsible for linear increase with the decreasing incrementary ratio. Unlike to the normal sedimentary remolded soils,the coefficient of Secondary Consolidation of hydraulic fill ultra soft soil shows a peak value as the Consolidation pressure is applied. Load ratiohad significant influence on the coefficient of Secondary Consolidation of hydraulic fill ultra soft soil. The smaller incremental load can reduce the coefficient of Secondary Consolidation. The coefficients of Secondary Consolidation of the ultra soft soil and normal sedimentary remolded soils are increased with increasing moisture content.

  • Secondary Consolidation characteristics of soft clay foundation of dredger fill site
    Rock and Soil Mechanics, 2015
    Co-Authors: Lei Huayan
    Abstract:

    A series of one-dimensional Consolidation tests is conducted on soft clay from dredger fill site of central fishing port area in Tianjin. The relationship among stress, strain and time is obtained; the characteristics of the Consolidation and Secondary Consolidation of dredger fill and natural sedimentary soil are compared, providing theory evidence for the deformation model of soft clay foundation of dredger fill site and the prediction of long-term settlement after construction. It is shown that strain rate has a good linear correlation with double logarithm curve of time for both dredger fill and natural sedimentary soil. After processing, the water content and compressibility of dredger fill is low, while that of natural sedimentary soil remains high. With the increase of Consolidation pressure, the coefficient of Secondary Consolidation of dredger fills changes a little. For natural sedimentary soil, the coefficient of Secondary Consolidation increases first and then decreases, levels out eventually. The coefficient of Secondary Consolidation still has a good linear correlation with compression index. It keeps a logarithmic downtrend with the increasing of time.

  • exploration on division of primary Secondary Consolidation and influential factors with soft soil
    Journal of Engineering Geology, 2014
    Co-Authors: Lei Huayan
    Abstract:

    Division of primary-Secondary Consolidation is one of the key problems of prediction and analysis foundation deformation of soft soil correctly and taking effective engineering measures. A series of one dimensional compression Secondary Consolidation tests and three-dimensional Secondary Consolidation tests are performed by using unidirectional Consolidation apparatus and triaxial shear apparatus for the typical soft soil in Tianjin. Load,pore ratio and pore water pressure,volume strain and time relationship are obtained. The test results show that: the division point of primary-Secondary Consolidation should be before the pore water pressure dissipation completely. A new method according to the strain rate and strain curve to differentiate the primary and Secondary Consolidation is founded. And the new method is suitable for all kinds of load. Primary Consolidation time is prolonged along with increasing sample height while shortened along with the strengthening of drainage condition. With the increase of the load level,primary Consolidation time is prolonged. When the load is less than the structure yield stress,thedivision of the primary-Secondary Consolidation is less affected by load ratio. While the load is greater than the structure yield stress,the primary Consolidation time is prolonged along with the increase of load ratio. The ratio of the primary Consolidation strain and the total strain after preloading is increased 30. 7% than that of no preloading.The ratio increases along with the increase of the preloading load.

  • research on Secondary Consolidation of clay under different squeezing disturbance
    Rock and Soil Mechanics, 2013
    Co-Authors: Lei Huayan
    Abstract:

    Foundation treatment and shield construction disturbance are the causes of squeezing soil which damages the initial structure and state,leads to the disturbance of soil,and changes the property of Secondary Consolidation.According to the squeezing disturbance of different levels caused by different preloads,a series of step-loading Consolidation tests are conducted.The results indicate that,with the increase of preloads,the structure yield stress increases,compression index is almost the same when preload is less than structure yield stress,and decreases suddenly when preload is larger than structure yield stress;then it comes to a steady value.The Secondary Consolidation coefficient increases firstly,then decreases,finally gets to steady with the increase of pressure;and the Secondary Consolidation coefficient would decrease when disturbance increases;and a computational model for Secondary Consolidation coefficient is put forward;and the model coincides well according to the several testing data,and does well in predicting,which is useful for the prediction of post-load settlement.

Miao Lin-chang - One of the best experts on this subject based on the ideXlab platform.

  • Creep properties of Lianyungang soft clay and its engineering application
    Rock and Soil Mechanics, 2020
    Co-Authors: Miao Lin-chang
    Abstract:

    In order to study the creep properties of soft soil, a 1-D Consolidationcreep test has been completed. The creep properties are summed up from the test results. The effect of the Secondary Consolidation on the Consolidation process is analyzed by the parameter Cα/Δe100 Taking the saturated soft clay as viscoelastic body, a new method of separation of the Secondary Consolidation and primary Consolidation is proposed. The method can also be used by the data collected at the field. Some interesting conclusions concerning the effect of Secondary Consolidation are drawn from the test results.

  • Research on Engineering Properties of Lianyungang Soft Clay
    Journal of Highway and Transportation Research and Development, 2020
    Co-Authors: Miao Lin-chang
    Abstract:

    Based on many laboratory tests,the engineering properties of Lianyungang soft clay are investigated.Firstly,the relationship between its physical and mechanical indexes are obtained,then,the compressibility of Lianyungang soft clay is analyzed.With the comparison and evaluation of all calculation methods of Consolidation coefficient,a modified three-point method is put forward.Subsequently,the influences of stress level and stress history on the Secondary Consolidation coefficient are discussed.The relationship of the Secondary Consolidation coefficient and the compression index is discussed.Finally,according to the results of triaxial rheological test,Lianyungang soft clay can be investigated as an elastic-viscoplasticity.

Yannis F Dafalias - One of the best experts on this subject based on the ideXlab platform.

  • verification of the elastoplastic viscoplastic bounding surface model for cohesive soils
    Soils and Foundations, 1990
    Co-Authors: Victor N Kaliakin, Yannis F Dafalias
    Abstract:

    Verification analyses associated with the elastoplastic-viscoplastic bounding surface model for isotropic cohesive soils, which was developed in an earlier paper, are presented. Following a brief overview of its theoretical aspects and numerical implementation, the simulative and predictive capabilities of this model are described. It is shown that the model can realistically simulate and predict drained and undrained creep and stress relaxation, strain rate effects, and Secondary Consolidation. (Author/TRRL)

Victor N Kaliakin - One of the best experts on this subject based on the ideXlab platform.

  • verification of the elastoplastic viscoplastic bounding surface model for cohesive soils
    Soils and Foundations, 1990
    Co-Authors: Victor N Kaliakin, Yannis F Dafalias
    Abstract:

    Verification analyses associated with the elastoplastic-viscoplastic bounding surface model for isotropic cohesive soils, which was developed in an earlier paper, are presented. Following a brief overview of its theoretical aspects and numerical implementation, the simulative and predictive capabilities of this model are described. It is shown that the model can realistically simulate and predict drained and undrained creep and stress relaxation, strain rate effects, and Secondary Consolidation. (Author/TRRL)

Kang Jingwen - One of the best experts on this subject based on the ideXlab platform.

  • properties of Secondary Consolidation of two types of dredger fill sites
    Chinese Journal of Geotechnical Engineering, 2013
    Co-Authors: Kang Jingwen
    Abstract:

    By use of the unidirectional oedometer apparatus,a series of 1-D compression Secondary Consolidation tests on soil samples in two kinds of dredger fill sites are done.The relationship among stress,strain,void ratio and time is obtained,and the characteristics of the Secondary Consolidation and its influencing factors are compared.The results show that the Secondary Consolidation coefficient first increases with the increase of load and then decreases.In contrast,the value in unprocessed site is more than that in processed site.It also increases with the increases of moisture content,and the relationship curve is a concave.It keeps a linear increase with the compression index,at the same time,it keeps a logarithmic downtrend with the increasing time.The characteristics of the Secondary Consolidation are obviously influenced by the height and the drainage condition of soil samples.Based on the results,a simple and practical Secondary Consolidation coefficient model and deformation forecast method,which are suitable for the characteristics of dredger fill sites,are proposed.Compared with the experimenta;results,the proposed model can be employed to predict the deformation characteristics of the dredger fill sites.