Improving Behavior of Tunnel Lining Constructed in Layered Soil Including Soft Clay Layer Using Stone Columns

2013 ◽  
Vol 38 (12) ◽  
pp. 3289-3300 ◽  
Author(s):  
Mostafa Abdou Abdel Naiem Mahmoud
Keyword(s):  
Soft Clay ◽  
Tunnel Lining ◽  
Layered Soil ◽  
Stone Columns ◽  
Clay Layer

scholarly journals Numerical Study of Laterally Loaded Piles in Soft Clay Overlying Dense Sand

2021 ◽  
Vol 7 (4) ◽  
pp. 730-746
Author(s):  
Amanpreet Kaur ◽  
Harvinder Singh ◽  
J. N. Jha
Keyword(s):  
Layer Thickness ◽  
Soft Clay ◽  
Bending Moment ◽  
Layered Soil ◽  
Clay Layer ◽  
Pile Groups ◽  
Dense Sand ◽  
Lateral Capacity ◽  
Laterally Loaded ◽  
Pile Length

This paper presents the results of three dimensional finite element analysis of laterally loaded pile groups of configuration 1×1, 2×1 and 3×1, embedded in two-layered soil consisting of soft clay at liquid limit overlying dense sand using Plaxis 3D. Effects of variation in pile length (L) and clay layer thickness (h) on lateral capacity and bending moment profile of pile foundations were evaluated by employing different values of pile length to diameter ratio (L/D) and ratio of clay layer thickness to pile length (h/L) in the analysis. Obtained results indicated that the lateral capacity reduces non-linearly with increase in clay layer thickness. Larger decrease was observed in group piles. A non-dimensional parameter Fx ratio was defined to compare lateral capacity in layered soil to that in dense sand, for which a generalized expression was derived in terms of h/L ratio and number of piles in a group. Group effect on lateral resistance and maximum bending moment was observed to become insignificant for clay layer thickness exceeding 40% of pile length. For a fixed value of clay layer thickness, lateral capacity and bending moment in a single pile increased significantly with increase in pile length only up to an optimum embedment depth in sand layer which was found to be equal to three times pile diameter and 0.21 times pile length for pile with L/D 15. Scale effect on lateral capacity has also been studied and discussed. Doi: 10.28991/cej-2021-03091686 Full Text: PDF

Characterization of a smear zone around vertical drains by large-scale laboratory tests

2000 ◽  
Vol 37 (6) ◽  
pp. 1265-1271 ◽  
Author(s):  
J S Sharma ◽  
D Xiao
Keyword(s):  
Large Scale ◽  
Soft Clay ◽  
Excess Pore Pressure ◽  
Laboratory Model ◽  
Clay Layer ◽  
Prefabricated Vertical Drains ◽  
Vertical Drains ◽  
Undisturbed Samples ◽  
Oedometer Tests ◽  
Excess Pore

Installation of prefabricated vertical drains using a mandrel causes disturbance of clay surrounding the drain, resulting in a "smear" zone of reduced permeability. In this paper, an attempt is made to characterize the smear zone using large-scale laboratory model tests. Two tests, simulating the cases of "no smear" and "with smear," were conducted. Excess pore-water pressures were monitored at seven different locations along the radial direction. In addition, undisturbed samples were collected at various locations in the clay layer for conducting oedometer tests. The distribution of excess pore pressure due to drain installation gave a clear indication of the extent of the smear zone. The effect of reconsolidation on the properties of clay was found to be much greater than that of the remoulding of the clay. The extent of the smear zone was also confirmed from the change in permeability of the clay layer in the smear zone obtained from oedometer tests. The radius of the smear zone is about four times that of the mandrel, and the horizontal permeability of the clay layer in the smear zone is approximately 1.3 times smaller than that in the intact zone.Key words: consolidation, permeability, smear zone, soft clay, vertical drains.

Numerical modelling of stone columns in soft clay under an embankment

2008 ◽  
pp. 305-311 ◽  
Author(s):  
M Gäb ◽  
H Schweiger ◽  
V Racansky ◽  
T Weber ◽  
S Springman
Keyword(s):  
Numerical Modelling ◽  
Soft Clay ◽  
Stone Columns

scholarly journals Behavior of Geosynthetic-Encased Stone Columns in Soft Clay: Numerical and Analytical Evaluations

2018 ◽  
Vol 41 (3) ◽  
pp. 333-343 ◽  
Author(s):  
Nima Rostami Alkhorshid ◽  
Gregório Luís Silva Araújo ◽  
Ennio Marques Palmeira
Keyword(s):  
Soft Clay ◽  
Stone Columns

scholarly journals Effects of the Stiffness of Soft Clay Layer on Strong Motion Response.

2002 ◽  
Vol 42 (1) ◽  
pp. 17-33 ◽  
Author(s):  
AKIRA YAMAGUCHI ◽  
MOTOKI KAZAMA ◽  
HIROFUMI TOYOTA ◽  
MASAKI KITAZUME ◽  
TAKAHIRO SUGANO
Keyword(s):  
Soft Clay ◽  
Strong Motion ◽  
Clay Layer ◽  
Motion Response
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