Prediction of Quantitative Response of Under-Reamed Anchor Piles in Soft Clay Using Laboratory Model Study

2017 ◽  
Vol 46 (2) ◽  
pp. 20160341 ◽  
Author(s):  
Y. S. Golait ◽  
A. H. Padade ◽  
T. Cherian
Keyword(s):  
Soft Clay ◽  
Laboratory Model ◽  
Model Study ◽  
Quantitative Response

Experimental Observations of Settlement of Footings Supported on Soft Clay Reinforced with Granular Columns: Laboratory Model Study

2016 ◽  
Vol 142 (1) ◽  
pp. 04015063 ◽  
Author(s):  
D. K. Noor Muneerah PG Haji Jeludin ◽  
V. Sivakumar ◽  
B. C. O’Kelly ◽  
P. A. Mackinnon
Keyword(s):  
Soft Clay ◽  
Laboratory Model ◽  
Model Study

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.

Improved air-booster vacuum preloading method for newly dredged fills: Laboratory model study

2019 ◽  
Vol 38 (4) ◽  
pp. 493-510 ◽  
Author(s):  
Huayang Lei ◽  
Yao Hu ◽  
Gang Zheng ◽  
Jingjin Liu ◽  
Lei Wang ◽  
...  
Keyword(s):  
Laboratory Model ◽  
Vacuum Preloading ◽  
Model Study ◽  
Preloading Method

Negative skin friction from surface settlement measurements in model group tests

1995 ◽  
Vol 32 (6) ◽  
pp. 1075-1079 ◽  
Author(s):  
Mehmet Ufuk Ergun ◽  
Devrim Sönmez
Keyword(s):  
Soft Clay ◽  
Soil Surface ◽  
Pile Group ◽  
Friction Model ◽  
Model Group ◽  
Pile Groups ◽  
Negative Skin Friction ◽  
Dense Sand ◽  
Model Study ◽  
Negative Friction

Groups of model wood piles driven to end bearing through dense sand over soft clay were used to determine the relative settlement of the soil surface inside and outside the groups as the soil was compressed by air pressure. Square 30 mm piles at spacings of 2 to 6 times the pile width were used in groups of 3 × 3, 4 × 4, and 5 × 5. The results indicate that pile group effects were negligible at pile spacings at 5 to 6 pile widths. Key words : negative friction, model study, pile groups, sand.

Stone Columns with Vertical Circumferential Nails: Laboratory Model Study

2010 ◽  
Vol 28 (5) ◽  
pp. 695-706 ◽  
Author(s):  
R. Shivashankar ◽  
M. R. Dheerendra Babu ◽  
Sitaram Nayak ◽  
R. Manjunath
Keyword(s):  
Stone Columns ◽  
Laboratory Model ◽  
Model Study

Improved Synchronous and Alternate Vacuum Preloading Method for Newly Dredged Fills: Laboratory Model Study

2018 ◽  
Vol 18 (8) ◽  
pp. 04018086 ◽  
Author(s):  
Jingjin Liu ◽  
Huayang Lei ◽  
Gang Zheng ◽  
Shuangxi Feng ◽  
M. S. Rahman
Keyword(s):  
Laboratory Model ◽  
Vacuum Preloading ◽  
Model Study ◽  
Preloading Method

Centrifuge Study of the Effects of Lattice Leg on Penetration Resistance and Bearing Behavior of Spudcan Foundations in NC Clay

2012 ◽  
Author(s):  
Yu Ping Li ◽  
Fook Hou Lee ◽  
Siang Huat Goh ◽  
Jiang Tao Yi ◽  
Xi Ying Zhang
Keyword(s):  
Bearing Capacity ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Clay ◽  
Penetration Resistance ◽  
Cavity Depth ◽  
Circular Column ◽  
Model Study ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

This paper reports the primary results of a centrifuge model study into the possible effects of the lattice leg on the penetration resistance and vertical bearing capacity of spudcan foundations in normally consolidated clay. Up to now, the possible effects of the lattice leg has been largely ignored in both research and design of spudcan foundation. Centrifuge experimental results show that there is an increase in penetration resistance for spudcan footing equipped with lattice leg, in comparison with spudcan footing connected to slender circular column leg as widely used by current research. Larger excess pore water pressure was generated by the spudcan penetration with lattice leg in compare with that without. Moreover, the presence of the lattice leg is shown to affect the cavity depth formed around the penetrated spudcan footing, which is simply assumed completely back flow for spudcan penetration in soft clay by SNAME (2008). It was found that the bearing capacity of spudcan foundation has been further underestimated by SNAME (2008) due to the neglecting of lattice leg effect. Taken altogether, this implies that changes in penetration resistance arising from the lattice leg may be due to the effect of the latter on the backflow pattern. Apart from highlighting the effect of the sleeve with big openings, the results also highlight the possible future use of sleeves to enhance the bearing capacity and possibly reduce the penetration of spudcan foundations in various soil deposits.

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