Extreme scour effects on the buckling of bridge piles considering the stress history of soft clay

2015 ◽  
Vol 77 (2) ◽  
pp. 1143-1159 ◽  
Author(s):  
Fayun Liang ◽  
Hao Zhang ◽  
Maosong Huang
Keyword(s):  
Soft Clay ◽  
Stress History ◽  
History Of

Determining Preconsolidation Pressure of the Lakeside New District Soft Clay of Hefei Based on Casagrande Method by Matlab

2013 ◽  
Vol 291-294 ◽  
pp. 1113-1116
Author(s):  
Yan Shao ◽  
Chang Yong Li ◽  
Yuan Wei
Keyword(s):  
Soft Clay ◽  
Least Square Method ◽  
Least Square ◽  
Compression Curve ◽  
Stress History ◽  
Important Index ◽  
Preconsolidation Pressure ◽  
Quartic Polynomial ◽  
History Of ◽  
Calculation Parameter

The preconsolidation pressure is an important index to determine the stress history of soil and also a major calculation parameter for the analysis of soil stratum’s deformation in the different stress history. Casagrade method is worldwide applied to determine the preconsolidation pressure. On the basis of research on consolidation test about the lakeside new district soft clay of Hefei by high pressure consolidation apparatus, and conformed to Casagrande method, the paper adopts quartic polynomial and least square method to fit the compression curve, and the preconsolidation pressure of the lakeside new distract soft clay of Hefei is determined by matlab software. The result provides reference for the calculation of foundation settlement considering stress history.

Study on Assessing Method of Stress History of Marine Soft Clay

2012 ◽  
Vol 616-618 ◽  
pp. 1741-1744
Author(s):  
Sheng Jie Di ◽  
Zhi Gang Shan ◽  
Ming Yuan Wang
Keyword(s):  
Soft Clay ◽  
Empirical Method ◽  
Foundation Engineering ◽  
Engineering Project ◽  
Stress History ◽  
Vane Shear Test ◽  
Soil Stress ◽  
Good Consistency ◽  
History Of ◽  
Assessing Method

The vane shear test (VST) is comprehensively analyzed by means of empirical method, which on soft ground of one offshore foundation engineering project in Jiangsu province of China. The methods of judgment of soil stress history are summarized. Based on the shear strength of soft clay, consolidation state of the soft clay is obtained. The conclusion shows that it belongs to slight over-consolidation state. In the meantime, the two evaluation methods are comparatively analyzed. In the depth more than 5 m, the curves of over consolidation ratio (OCR) of two methods show a good consistency. The methods and applications can provide useful reference for engineers.

scholarly journals The relationship between sea-level change, soil formation and stress history of a very soft clay deposit

2019 ◽  
Vol 5 (3) ◽  
pp. 461-479 ◽  
Author(s):  
Fernando A.B. Danziger ◽  
◽  
Graziella M.F. Jannuzzi ◽  
Ian S.M. Martins ◽  
Keyword(s):  
Sea Level ◽  
Soft Clay ◽  
Soil Formation ◽  
Sea Level Change ◽  
Stress History ◽  
Clay Deposit ◽  
Level Change ◽  
History Of ◽  
The Relationship

scholarly journals Scour Effects on the Lateral Behavior of a Large-Diameter Monopile in Soft Clay: Role of Stress History

2019 ◽  
Vol 7 (6) ◽  
pp. 170 ◽  
Author(s):  
Ben He ◽  
Yongqing Lai ◽  
Lizhong Wang ◽  
Yi Hong ◽  
Ronghua Zhu
Keyword(s):  
Large Diameter ◽  
Soft Clay ◽  
Small Diameter ◽  
Initial Stiffness ◽  
Stress History ◽  
Soil Stiffness ◽  
Hypoplastic Model ◽  
History Effects ◽  
Conservative Estimation ◽  
Lateral Behavior

Scouring of soil around large-diameter monopile will alter the stress history, and therefore the stiffness and strength of the soil at shallow depth, with important consequence to the lateral behavior of piles. The existing study is mainly focused on small-diameter piles under scouring, where the soil around a pile is analyzed with two simplified approaches: (I) simply removing the scour layers without changing the strength and stiffness of the remaining soils, or (II) solely considering the effects of stress history on the soil strength. This study aims to investigate and quantify the scour effect on the lateral behavior of monopile, based on an advanced hypoplastic model considering the influence of stress history on both soil stiffness and strength. It is revealed that ignorance about the stress history effect (due to scouring) underestimates the extent of the soil failure wedge around the monopile, while overestimates soil stiffness and strength. As a result, a large-diameter pile (diameter D = 5 m) in soft clay subjected to a souring depth of 0.5 D has experienced reductions in ultimate soil resistance and initial stiffness of the p-y curves by 40% and 26%, and thus an increase of pile head deflection by 49%. Due to the inadequacy to consider the stress history effects revealed above, the existing approach (I) has led to non-conservative estimation, while the approach (II) has resulted in an over-conservative prediction.

Effect of stress history of saturated clay on engineering behaviour of an energy pile

2020 ◽  
pp. 1-10
Author(s):  
Di Wu ◽  
Han-Long Liu ◽  
Gang-Qiang Kong ◽  
Hossam Abuel-Naga
Keyword(s):  
Stress History ◽  
Energy Pile ◽  
Saturated Clay ◽  
History Of

Shear modulus and damping of soft Bangkok clays

2002 ◽  
Vol 39 (5) ◽  
pp. 1201-1208 ◽  
Author(s):  
Supot Teachavorasinskun ◽  
Pipat Thongchim ◽  
Panitan Lukkunaprasit
Keyword(s):  
Shear Modulus ◽  
Seismic Analysis ◽  
Damping Ratio ◽  
Soft Clay ◽  
Cyclic Stress ◽  
Large Strains ◽  
Cyclic Triaxial ◽  
Stress History ◽  
Load Frequency ◽  
Equivalent Shear Modulus

The shear modulus and damping ratio of undisturbed Bangkok clay samples were measured using a cyclic triaxial apparatus. Although abundant literature on this topic exists, selection of the most suitable empirical correlation for a seismic analysis cannot be done unless site specific data are obtained. The apparatus used in this research can measure the stress–strain relationships from strain levels of about 0.01%. The equivalent shear modulus measured at these strains was about 80% of the value obtained from the shear wave velocity measurements. The degradation curves of the equivalent shear modulus fell into the ranges reported in the literature, for clay having similar plasticity. The damping ratios varied from about 4–5% at small strains (0.01%) to about 25–30% at large strains (10%). The effects of load frequency and cyclic stress history on the shear modulus and damping ratio were also investigated. An increase in load frequency from 0.1 to 1.0 Hz had no influence on the shear modulus characteristic, but it did result in a slight decrease in the damping ratio. The effects of the small amplitude cyclic stress history on the subsequently measured shear modulus and damping ratio were almost negligible when the changes in void ratio were taken into account.Key words: soft clay, shear modulus, damping ratio, cyclic triaxial test, cyclic stress history.

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