Consolidation settlement of pile groups is computed using the following simplified assumptions: 1. Assume the pile group to be a solid foundation with a depth of 2/3 the length of piles. 2. Effective stress at midpoint of the clay layer is used to compute settlement. 3. Consolidation equation.Web
قرأ أكثر
Land subsidence is an important environmental problem in the North China Plain (NCP). A typical subsidence area mainly located on adjoining areas of Beijing and Hebei provinces was selected to study the consolidation characteristics of deep clayey soil. Clay samples were collected from 14 boreholes at different depths, and the compression …Web
قرأ أكثر
Fig 10.2 Vertical stress changes during consolidation The stress changes throughout the depth of a soil layer in a one dimensional field situation are ... shown in Fig. 10.5., in …Web
قرأ أكثر
This paper presents a model to describe the above important phenomena during the consolidation of sensitive clay with vertical drain. The solution for proposed model can be obtained by extending the closed-form solution of the consolidation of double-layered ground with vertical drain by the interactive method introducing the …Web
قرأ أكثر
b) as the fluid drains out, the fluid pressure in the silt/clay layer will drop; c) as this occurs, the increased vertical stress ∆q in the silt/clay will be carried by effective stresses; d) as the stress increase ∆q is transferred to the soil skeleton, the silt/clay layer will gradually compress. This is because the soil skeleton isWeb
قرأ أكثر
This paper investigated the large-strain consolidation of soft clay with vertical drains under free-strain theory, considering the elastic viscoplastic constitutive relation of soft soil, the coupled vertical–radial non-Darcian flow, and the logarithmic relationship of the permeability coefficients. Meanwhile, the nonideal cylindrical unit ...Web
قرأ أكثر
Application of vertical drains in soft clay soils is a common practice widely known to facilitate the consolidation rate. To overcome the adverse impact of a long …Web
قرأ أكثر
If $300-mat{mm}$ diameter sand drains at $4 mat{~m}$ centres in a square pattern were installed in the clay, in what time would the same overall degree of consolidation be reached? The coefficients of consolidation in the vertical and horizontal directions, respectively, are $9.6$ and $14.0 mat{~m}^{2} /$ year.Web
قرأ أكثر
Electrokinetic treatment applies the principle of electro-osmosis in combination with PVDs to improve the engineering properties of soft clay and, in the process, accelerate the consolidation and strengthening of soft clay. Among the many processes occurring during EO treatment is the reduction of pore water in the soil.Web
قرأ أكثر
Consolidation of soil (normally consolidated) can be evaluated from the following equation as discussed in this article. S c = C c H c /(1+e 0) log[(σ' 0 +Δσ' av)/σ' 0]. Where. S c – consolidation settlement in the normally consolidated clay. C c – Compression index – to be evaluated from the laboratory testing. H c – Height of the clay …Web
قرأ أكثر
This paper presents a model to describe the above important phenomena during the consolidation of sensitive clay with vertical drain. The solution for proposed model can be obtained by extending the closed-form solution of the consolidation of …Web
قرأ أكثر
time, the vertical effective stress was: (σ′v) = 5'*(110)pcf + 10'*(115−62.4)pcf = 1076 psf Since the vertical effective stress a long time ago was greater than what the current …Web
قرأ أكثر
2.1 Materials and Equipment. The clay used in this experiment was collected from a highway construction site in Huizhou City, Guangdong Province, China. The basic physical and mechanical parameters of the soil are listed in Table 1.The water content was measured by oven-drying method according to ASTM D2216-10 ().Note the specific …Web
قرأ أكثر
To further investigate the rheological consolidation mechanism of soft soil ground with vertical drains, the fractional-derivative Merchant model (FDMM) is introduced to describe the viscoelastic behavior of saturated clay around the vertical drains, and the flow model with the non-Newtonian index is employed to describe the non-Darcian flow in …Web
قرأ أكثر
"Consolidation theory of unsaturated soils with vertical drains considering well resistance and smear effect under time-dependent loading." J. Eng. Mech. 147 (9): …Web
قرأ أكثر
consolidation of saturated clay subjected to external load ∆σ . The springs and the surrounding water represent the saturated soil. The springs ... In this arrangement the compression is one dimensional and flow will be in the vertical direction. When pressure ∆σ is applied this will be borne by water surrounding the springWeb
قرأ أكثر
Likewise, the reinforced clay mass settles more rapidly than the untreated one as the provision of drains perpetuates consolidation process. The soft clay undergoes a consolidation settlement of 0.272 m in the presence of SVD within 244 days whereas a vertical deformation of 0.261 m is observed within 376 days of consolidation period in …Web
قرأ أكثر
The ratio of vertical and radial consolidation stresses, K, is employed here, to investigate the effects of consolidation stress paths on the shear characteristics of overconsolidated clay, in terms of stress-strain, shear strength, pore water pressure and effective stress path behaviors. Based on the test results, the following conclusions are ...Web
قرأ أكثر
The settlement caused by consolidation in clay may be several times greater than the elastic settlement. Description of primary consolidation process: 45. Consolidation ... Initial stresses at mid-depth of clay (z = 2.0 m) Vertical total stress sv = 20.0 x 2.0 + 72.0 = 112.0 kPa Pore pressure u = 10 x 2.0 = 20.0 kPa Vertical effective …Web
قرأ أكثر
To some extent, it indicates that the vertical drainage capacity of clay plays an increasingly important role in the consolidation settlement of newly formed land …Web
قرأ أكثر
A consolidation model of soft clays under cyclic loading incorporating both radial and vertical drainages, and nonlinear variation of compressibility and permeability is presented in this paper. The prediction of the model matches well with the result from a large-scale cyclic triaxial test conducted on a soil sample installed with a single PVD.Web
قرأ أكثر
Question: A laboratory consolidation test was performed with doubledrainage on a normally consolidated (NC) clay sample extracted from a soil profile at a construction site. The following details are known:Initial vertical effective stress σ'?2=200kPa initial voidratio e0=1.0Final vertical effective stress σV'=400kPa and e=0.8 at theend of …Web
قرأ أكثر
Figure 4 shows variation in the undrained strength ratio with vertical consolidation stress. The undrained strength ratio varies between 0.18 and 0.42, which is much larger than the actual value range …Web
قرأ أكثر
A rigorous solution for the consolidation of soil by displacement-type vertical drains with finite permeability is presented taking into account the disturbance in a clay ring surrounding the drain pile caused by drain installation. The accuracy of both Barron's and Hansbo's approximate solutions regarding well resistance and smear is ...Web
قرأ أكثر
Large-strain elastic viscoplastic consolidation analysis of very soft clay layers with vertical drains under preloading. Canadian Geotechnical Journal, 51(2): 144-157. Indraratna, B. (2010). 2009 EH Davis Memorial Lecture: Recent advances in the application of vertical drains and vacuum preloading in soft soil stabilization.Web
قرأ أكثر
To speed up the primary consolidation of the plastic clay, vertical wick drains ( r w = 32 mm, triangular pattern) with a spacing of 1.5 m are installed penetrating to the top of the sand layer. Ignore the smear effect. Compute settlement of the ground surface after one year and 50 years.Web
قرأ أكثر
Application of vertical drains in soft clay soils is a common practice widely known to facilitate the consolidation rate. To overcome the adverse impact of a long-lasting consolidation process, highly permeable materials such as sand and crushed aggregates are used as drains. However, limited information exists regarding the applicability of …Web
قرأ أكثر
Fig 10.2 Vertical stress changes during consolidation The stress changes throughout the depth of a soil layer in a one dimensional field situation are ... shown in Fig. 10.5., in which a compressible clay is sandwiched between two relatively incompressible sand layers, the water table being at the ground surface. ...Web
قرأ أكثر