Deformation Analysis in Soft Ground Improvement by Jinchun Chai

By Jinchun Chai

This ebook offers with the behaviour of sentimental floor superior through a number of the extra universal tools, together with the set up of prefabricated vertical drains (PVDs), or the deploy of soil-cement columns shaped by way of deep blending, or the preloading of soppy floor via program of a vacuum strain as well as, or rather than, a surcharge loading. particularly, it describes the theories and the numerical modelling strategies which may be utilized to those gentle floor development schemes to estimate the instant and time-dependent mechanical reaction of the in situ soil. specific emphasis has been put on equipment that reliably expect flooring deformations linked to flooring development techniques.

The booklet commences with a quick description of many of the flooring development equipment after which describes basic strategies for modelling the behaviour of sentimental clay subsoils by way of the finite aspect technique, in addition to information of the tools for modelling tender soils more advantageous via the install of PVDs. it's also chapters describing the idea of vacuum consolidation and techniques for calculating vacuum pressure-induced floor deformation, in addition to a idea which might be used to foretell the reaction of soppy flooring better via the set up of soil-cement columns. a huge distinguishing characteristic of this ebook is the regimen use of comparisons of predictions of the proposed versions with the result of laboratory reviews, and especially box case experiences, with a purpose to validate the proposed tools of research. the sector case histories are from tender soil websites at a number of destinations round the world.

The e-book is directed in the direction of scholars of geotechnical engineering in addition to geotechnical practitioners. often it presents entire derivations of lots of the vital theoretical effects, because the purpose was once to put in writing a booklet that may be used as either a instructing textual content and a reference paintings for college kids and practitioners.

Audience: The booklet is meant for geotechnical practitioners in addition to for students.

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26 2 Modelling Soft Clay Behaviour 20 20 F P4 Predicted Case-3 10 Excess pore pressure, (kPa) 0 10 20 30 40 0 10 20 30 40 10 20 30 40 0 30 40 0 10 Average pressure, p (kPa) 20 30 40 20 0 20 P5 P5 10 0 10 0 10 20 20 30 40 0 0 20 P6 P6 10 0 P4 P5 P6 Predicted Case-4 10 0 F P4 P4 P5 P6 10 0 10 20 Fig. 13 Comparison of excess pore water pressures at P4 to P6 for Case-3 for the eccentric loading case (measured data from Miyake et al. 1994) B Unit: % 60 50 40 2B 30 20 10 8 6 4 2B Case 3 20 2 Enlarged part A 4B (a) Measured at S/B = 11% 1 4B (b) FEM analysis at S/B = 5% at the edge Fig.

0 m spacing (MHA 1989a). 0 m of weathered crust that is underlain by about 5 m of very soft silty clay. 0 m thick peat layer with high water content. A thick deposit of medium dense to dense clayey silty sand underlies the peat layer. 0 m below the ground surface. 8 (Asian Institute of Technology (AIT) 1988, 1989). The meshes and the boundary conditions used in the finite element analysis are shown in Fig. 24. The construction history is given in Fig. 25. The analyses were carried out using the CRISP-AIT finite element program (Chai 1992), which was developed based on the original CRISP program (Britto and Gunn 1987).

Chai et al. (2001) derived an equation for calculating the equivalent vertical hydraulic conductivity in the PVD-improved zone, which can be used to evaluate this “smear” effect. This matter is also considered in more detail in Chapter 3. 26 m. , kh /ks = 65. 3 Modelling the Embankment Construction Process 39 (a) applying a percentage of the self-weight of all the embankment elements; and (b) the method proposed by Chai and Bergado (1993a), as described previously. For both methods the adopted loading rate at the embankment centerline closely simulated the actual loading rate.

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