Critical state parameters and peak stress envelopes for Bangkok Clays

Ground Improvement Case Histories

2015

Section: Soft Claymentioning

confidence: 99%

“…There were no direct measurements of the moduli of the soils at the site. The drained strength parameters were obtained from data on Bangkok clay obtained by Balasubramaniam et al (1978). Balasubramaniam and Brenner (1981) reported the value of a to be 250 for Bangkok clay.…”

Section: Medium Stiff Clay and Stiff Claymentioning

confidence: 99%

Full-Scale Tests on Stiffened Deep Cement Mixing Piles Including Three-Dimensional Finite Element Simulation

Jamsawang

Ground Improvement Case Histories

2015

“…The MCM was used to model the weathered crust layer, medium stiŠ clay layer and stiŠ clay layer. The material properties were obtained from the previous test data on Bangkok clay (Balasubramaniam et al, 1978). The soft clay layer from 2 m to 8 m depth was modeled by the Soft Soil Model (SSM).…”

Section: Materials Models and Parametersmentioning

confidence: 99%

“…The SSM is a Cam-clay type model developed by Vermeer and Brinkgreve, 1995. The material properties were obtained from the previous test data on Bangkok clay (Balasubramaniam et al, 1978) and the result of previous investigations (Chai 1992;Bergado et al, 1995;Bergado et al, 2002a, b). The FEM parameters for all the materials are also tabulated in Table 2.…”

Section: Materials Models and Parametersmentioning

confidence: 99%

Behavior and Simulation of Deep Cement Mixing (DCM) and Stiffened Deep Cement Mixing (SDCM) Piles Under Full Scale Loading

Suksawat

et al. 2011

Soils and Foundations

108

Professor in Geotechnical Engineering Program, School of Engineering and Technology, Asian Institute of Technology, Thailand (bergado＠ ait.ac.th).iii) M. Eng. Graduate, ditto. iv) Doctoral Graduate, ditto. v) Regional Technical Manager of PLAXIS Asia. The manuscript for this paper was received for review on January 29, 2010; approved on December 7, 2010. Written discussions on this paper should be submitted before November 1, 2011 to the Japanese Geotechnical Society, 4-38-2, Sengoku, Bunkyo-ku, Tokyo 112-0011, Japan. Upon request the closing date may be extended one month. ABSTRACT A new kind of Deep Cement Mixing (DCM) pile called StiŠened Deep Mixing Pile (SDCM) is introduced to mitigate the low ‰exural strength and unexpected failures of DCM piles. A jet grouting method with a jet pressure of 22 MPa, was utilized in the installation of DCM piles. The SDCM pile consists of a DCM pile with a precast reinforced concrete core pile inserted at its center. Pile and embankment load tests were conducted, and then the results of theˆeld load tests were simulated by a 3Dˆnite element method (FEM) to back-analyze and conˆrm the related design parameters. These parameters were then used further in numerical experiments. Theˆeld test results showed that the settlements and lateral movements of the SDCM pile using a prestressed concrete core pile with area ratio (A core /A DCM ) of 0.17 and a length ratio of 0.85 was less than those of the DCM pile by 40z and 60z, respectively. Moreover, the SDCM pile foundation increased the bearing capacity by as much as 2.2 times. The average lateral pile capacity of the SDCM piles was 15 times higher than the DCM piles. A strength reduction factor of 0.40 was obtained at the concrete core and the DCM interface from the full scale pullout test. The behavior of both the DCM and SDCM piles was conˆrmed from the subsequent 3D FEM simulations. From the 3D FEM simulations, the length of the concrete core pile had more in‰uence on the settlements of the SDCM pile than its cross-sectional area. However, both the length and cross-sectional area of concrete core pile aŠected the lateral resistance of the SDCM pile.

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“…The friction angle of the soft clay layer was assumed to be 23 as suggested by Balasubramaniam et al (1978) for soft Bangkok clay.…”

Section: Soft Claymentioning

confidence: 99%

Numerical simulation and sensitivity analyses of full-scale test embankment with reinforced lightweight geomaterials on soft Bangkok clay

Tanchaisawat

Geotextiles and Geomembranes

2008