BEHAVIOR OF AN OVERPASS CARRIED ON FOOTINGS AND FRICTION PILES

1969 ◽  
Vol 6 (4) ◽  
pp. 369-382 ◽  
Author(s):  
L. S. Brzezinski
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Group Action ◽  
Undrained Shear Strength ◽  
Load Test ◽  
Soil Conditions ◽  
Single Pile ◽  
Marine Clay ◽  
Friction Pile ◽  
Undrained Shear

A long overpass structure with 32 piers between abutments was founded on strip footing and friction pile foundations in a deep marine clay subsoil of firm consistency. The piles were steel H-sections which were provided at the construction stage at 6 pier locations in lieu of footings because of unfavorable soil conditions exposed during excavation. A load test to failure on a single pile indicated the pile–soil adhesion to be considerably lower than the undrained shear strength of the clay.Post-construction observations indicated the settlement of the pile-supported piers to be about 50% that of the adjacent footing supported piers. The settlements of both types of foundations were small and within tolerable limits. The design approaches used for prediction of footing settlements and the group action of friction piles in bearing capacity and settlement are presented in the paper.

Bearing capacity under increasing undrained shear strength

2020 ◽  
Vol 20 (5) ◽  
pp. 295-307
Author(s):  
André Arnold ◽  
Manuel Krähenbühl ◽  
Weiyuan Zhang ◽  
Amin Askarinejad
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Undrained Shear Strength ◽  
Undrained Shear

In-situ evaluation of undrained shear strength from seismic piezocone penetration tests for soft marine clay in Jiangsu, China

2019 ◽  
Vol 20 ◽  
pp. 100253
Author(s):  
Wei Duan ◽  
Guojun Cai ◽  
Songyu Liu ◽  
Anand J. Puppala ◽  
Ruifeng Chen
Keyword(s):  
Shear Strength ◽  
Undrained Shear Strength ◽  
Marine Clay ◽  
Penetration Tests ◽  
Undrained Shear

Experimental and Statistical Study on Single and Groups of Stone Columns

2020 ◽  
Vol 857 ◽  
pp. 399-408
Author(s):  
Maki J. Mohammed Al-Waily ◽  
Mohammed Y. Fattah ◽  
Maysa Salem Al-Qaisi
Keyword(s):  
Shear Strength ◽  
Stress Concentration ◽  
Bearing Capacity ◽  
Soft Clay ◽  
Undrained Shear Strength ◽  
Stone Columns ◽  
Stone Column ◽  
Dependent Variables ◽  
Undrained Shear ◽  
Improvement Ratio

In the present study, 24 laboratory models on soft clay treated with stone columns were carried out. The results for each case are analysed for the purpose of constructing a statistical model linking the variables studied. The experiments showed that the stress concentration and bearing capacity of soil treated with stone column increase with increasing the undrained shear strength (cu), number of columns and L/d ratio. The models represent a single stone column and a group of stone columns. The studied variables are three dependent variables, the stress concentration ratio (n), bearing capacity of soil treated with stone column (q) and the settlement improvement ratio (Sr) due to the existence of stone columns. The independent variables are six: the undrained shear strength of clay soil, with three values (6, 9 and 12 kPa), the number of stone columns (1, 2, 3 and 4 columns) and the length (L) to the diameter (D) of the stone column or (L/D) ratio in two values (6 and 8). Besides, the bearing capacity of the soil treated (q) with stone columns and the settlement improvement ratio were used in some statistical models as independents. After regression analysis, a set of equations that correlate the previous variables have been suggested. The incepted values for dependent variables are close to the laboratory results.

Study on the Variation Regularity of Shear Strength of Saturated Soft Clay under Cyclic Loading

2011 ◽  
Vol 250-253 ◽  
pp. 2388-2391 ◽  
Author(s):  
Xiao Ping Wang ◽  
Jian Qi Wu
Keyword(s):  
Shear Strength ◽  
Cyclic Loading ◽  
Bearing Capacity ◽  
Triaxial Test ◽  
Soft Clay ◽  
Undrained Shear Strength ◽  
Saturated Soft Clay ◽  
Undrained Shear

The stiffness and shear strength of soft clay attenuate under long-term cyclic loading, resulting in reduced foundation bearing capacity of road. The variation regularity of undrained shear strength of saturated soft clay which is normally consolidated or over consolidated under cyclic loading was studied with two-way vibration triaxial test, and some useful results are obtained.

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