A Soil-Water hysteresis model for unsaturated sands based on fuzzy set plasticity theory

Min, Tuk-Ki; Huy, Phan Thieu

doi:10.1007/s12205-010-0165-x

Cited by 12 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this method does not consider the hysteresis phenomenon of the soil-water characteristic curve during the dry-wet cycles of the soil. Since the 1960s, many scholars have made great efforts and proposed various models for predicting the hysteresis characteristics of SWCCs, including the empirical model [7][8][9], the domain model [10][11][12][13][14], the boundary model [15][16][17][18], the rational extrapolation model [19], and the hysteresis simulation method [20][21][22][23]. In these models, the domain model has perfect theoretical foundation, and its prediction results are fairly accurate.…”

Section: Introductionmentioning

confidence: 99%

Effects of Contact Angle on the Hysteresis Effect of Soil‐Water Characteristic Curves during Dry‐Wet Cycles

Tao

Liu

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

The hysteresis characteristics of soil-water characteristic curves (SWCCs) under dry-wet cycling conditions are very important for understanding unsaturated soil properties, so it is crucial to propose an accurate and efficient method for predicting the hysteretic behaviors of SWCCs. To this end, this paper investigates the hysteresis characteristics of SWCCs in the full suction range of seven kinds of Hunan red clay with different initial dry densities by combination of the pressure plate method, the paper filter method, and the saturated salt solution method. It is found that there are, respectively, strong and weak hysteresis zones in the drying and wetting SWCCs under dry-wet cycling conditions. By combining this feature and based on the drying curve, the soil volume and contact angle changes during the drying and wetting processes are employed to predict the hysteretic behaviors of SWCCs. To verify the validity of the prediction method, the predicted curves of the samples with different initial dry densities are compared with the measured curves. The results show that in the strong hysteresis zone, the hysteresis characteristics of the drying and wetting SWCCs are mainly resulted from the changes in the soil pore structure; in the weak hysteresis zone, the hysteresis characteristics are mainly influenced by the changes in the receding and advancing contact angles corresponding to the drying and wetting processes. The Young–Laplace theory is used to transform the changes of contact angle during the drying and wetting processes into the proportional relationship k of matric suction, and the corresponding wetting curve is obtained by smoothing the drying curve. It is found that the prediction effect in the high suction part (the strong hysteresis zone) is better than that in the weak hysteresis zone, which confirms that the hysteresis effect of SWCCs in the high suction part is influenced by the contact angle. Our proposed method can greatly reduce the test period and has a significant practical application value, which provides a new idea for the prediction of SWCCs under dry-wet cycling conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Contact Angle on the Hysteresis Effect of Soil‐Water Characteristic Curves during Dry‐Wet Cycles

Tao

Liu

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

Fuzzy modeling of holding capacity of offshore suction caisson anchors

Kim

Ahn

Jung

2017

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Summary A fuzzy algorithm, the Takagi–Sugeno model, is implemented to develop a fuzzy inference system for predicting the holding capacity of suction caisson foundations for offshore platforms. The premise parameters of the fuzzy model are optimized by using a subtractive clustering algorithm. The consequent parameters are optimally determined via a weighted least square estimation. The input variables used for training the fuzzy model include the aspect ratio of the caisson, the undrained shear strength of the clay, and the angle that the chain force forms with the horizontal. The output of the proposed fuzzy model is the capacity of the suction caisson anchor. To demonstrate the effectiveness of the fuzzy modeling framework, the results of extensive finite element analyses are investigated. Comparisons of the trained fuzzy model with the data demonstrate that the proposed modeling framework is an effective method to estimate the holding capacity of offshore suction caisson systems. Moreover, the performance of the fuzzy model is robust against higher levels of input data uncertainties. Copyright © 2017 John Wiley & Sons, Ltd.

show abstract

Prediction of hysteretic behavior for unsaturated sands using the elasto-plastic constitutive relations

Min

Huy

2010

KSCE Journal of Civil Engineering

Self Cite

View full text Add to dashboard Cite

This paper presents how the elasto-plastic constitutive relations have been used to predict the hysteretic behavior in unsaturated sands. An efficient method was selected to represent the relation, and the predicted capabilities were assessed on many scanning curves. The proposed method is derived from Gajo and Wood's evolution equation for the plastic modulus to evaluate the suction change during wetting/drying processes. The study proposes the simple formulas for the relationship between the boundary curves and the scanning curves. The results obtained from the proposed formulas were verified through a comparison with the existing experimental data in the literature. The comparison indicates that the elasto-plastic constitutive relations during cyclic loading can be utilized to describe the scanning behavior of Soil Water Characteristic Curves (SWCCs).

show abstract

A Soil-Water hysteresis model for unsaturated sands based on fuzzy set plasticity theory

Cited by 12 publications

References 26 publications

Effects of Contact Angle on the Hysteresis Effect of Soil‐Water Characteristic Curves during Dry‐Wet Cycles

Effects of Contact Angle on the Hysteresis Effect of Soil‐Water Characteristic Curves during Dry‐Wet Cycles

Fuzzy modeling of holding capacity of offshore suction caisson anchors

Prediction of hysteretic behavior for unsaturated sands using the elasto-plastic constitutive relations

Contact Info

Product

Resources

About