Stiffness degradation of natural soft foundation in embankment dam under complex stress paths with considering different initial states

Wang, Yuke; Han, Musen; Yu, Xiang; Wan, Yongshuai; Shao, Jinggan; Ren, De-bo

doi:10.1016/j.apor.2020.102356

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…e torsional shear modulus evolution rules of frozen samples are inconsistent with those derived from previous studies of unfrozen soil [28,44]. e unfrozen soil specimen is softened by the accumulation of pore water pressure under cyclic loading.…”

Section: Torsional Resilient Modulus and Damping Ratiocontrasting

confidence: 55%

“…e unfrozen soil specimen is softened by the accumulation of pore water pressure under cyclic loading. In contrast, the frozen soil sample is hardened under cyclic loading because of the cementation of ice [28,44]. Besides, the temperature has a significant impact on the torsional resilient modulus.…”

Section: Torsional Resilient Modulus and Damping Ratiomentioning

confidence: 99%

“…However, it is difficult to investigate the characteristics of soil under principal stress rotation due to the intrinsic disadvantages of triaxial apparatuses. Hence, the hollow cylinder apparatuses (HCA) have been developed to explore the characteristics of soil under principal stress rotation and complex stress paths [23][24][25][26][27][28][29][30][31][32]. Nakata et al [23] and Tong et al [24] reported that an increase in pore pressure and strain could be solely triggered by continuous rotation of the principal stress axis, although the magnitude of the principal stresses remains constant.…”

Section: Introductionmentioning

confidence: 99%

“…Erken and Ulker [25] and Huang et al [26] found that the rotation of the principal stress axis can reduce dynamic strength. Mamou et al [27] and Wang et al [28] demonstrated that the principal stress rotation reduces the resilient modulus of the soil without changes in the magnitude of the principal stresses. Besides, Cai et al [29] and Qian et al [30] indicated that cyclic principal stress rotation accelerates the accumulative permanent deformation.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Temperature on Dynamic Characteristics of Frozen Clay under Principal Stress Rotation

Zhang

Wang

Zhou

et al. 2021

Advances in Materials Science and Engineering

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The foundation soil is always subjected to complex stress, including continuous rotation of the principal stress caused by traffic and earthquake loads. To comprehend the dynamic characteristics of frozen clay under complex stress sate, including continuous rotation of the principal stress, this study investigates the effect of temperature on the dynamic characteristics of frozen clay under principal stress rotation using a frozen hollow cylinder apparatus (FHCA-300). The test results reveal that the cumulative plastic strain of frozen clay samples exponentially increases with the rising of temperature under principal stress rotation. The influence of temperature is more profound with a high cyclic stress ratio (CSR). A decrease in temperature can improve the stiffness of the frozen clay, reduces its energy dissipation, and enhances its ability to resist dynamic loading. However, the principal stress rotation phenomenon may aggravate the damage of frozen clay and increase the energy dissipation and reduces its ability to resist dynamic loading. Based on the experimental data, an empirical expression was proposed to describe the coupling influence of CSRs and temperature on the axial resilient modulus of frozen clay, which can predict the development of axial resilient modulus under different thermal-mechanical conditions.

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Section: Torsional Resilient Modulus and Damping Ratiocontrasting

confidence: 55%

Section: Torsional Resilient Modulus and Damping Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Temperature on Dynamic Characteristics of Frozen Clay under Principal Stress Rotation

Zhang

Wang

Zhou

et al. 2021

Advances in Materials Science and Engineering

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“…For example, the stochastic simulation method [19][20][21][22], the stochastic perturbation method [23][24][25], and the orthogonal polynomial expansion method [26,27] were developed based on the stochastic structure problem. The statistical linearization method [28,29], the Fokker-Planck-Kolmogorov (FPK) method [30][31][32], the stochastic averaging method [33][34][35], the path integral method [36][37][38], and the non-Gaussian closure method [39] were developed based on the random vibration problem. However, for engineering structures with a large number of degrees of freedom (DOFs) and nonlinear and random coupling effects, all the aforementioned methods face tremendous challenges.…”

Section: Introductionmentioning

confidence: 99%

Stochastic Dynamic Response Analysis of the 3D Slopes of Rockfill Dams Based on the Coupling Randomness of Strength Parameters and Seismic Ground Motion

Pang

Song

2021

Mathematics

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Because rockfill strength and seismic ground motion are dominant factors affecting the slope stability of rockfill dams, it is very important to accurately characterize the distribution of rockfill strength parameters, develop a stochastic ground motion model suitable for rockfill dam engineering, and effectively couple strength parameters and seismic ground motion to precisely evaluate the dynamic reliability of the three-dimensional (3D) slope stability of rockfill dams. In this study, a joint probability distribution model for rockfill strength based on the copula function and a stochastic ground motion model based on the improved Clough-Penzien spectral model were built; the strength parameters and the seismic ground motion were coupled using the GF-discrepancy method, a method for the analysis of dynamic reliability of the 3D slope stability of rockfill dams was proposed based on the generalized probability density evolution method (GPDEM), and the effectiveness of the proposed method was verified. Moreover, the effect of different joint distribution models on the dynamic reliability of the slope stability of rockfill dams was revealed, the effect of the copula function type on the dynamic reliability of the slope stability was analysed, and the differences in the dynamic reliability of the slope stability under parameter randomness, seismic ground motion randomness, and coupling randomness of parameters and seismic ground motion were systematically determined. The results were as follows: the traditional joint distribution models ignored related nonnormal distribution characteristics of rockfill strength parameters, which led to excessively low calculated failure probabilities and overestimations of the reliability of the slope stability; in practice, we found that the optimal copula function should be selected to build the joint probability distribution model, and seismic ground motion randomness must be addressed in addition to parameter randomness.

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Pore Pressure Accumulation of Anisotropically Consolidated Soft Clay Subjected to Complex Loads Under Different Stress Paths

et al. 2021

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Stiffness degradation of natural soft foundation in embankment dam under complex stress paths with considering different initial states

Cited by 8 publications

References 25 publications

The Effect of Temperature on Dynamic Characteristics of Frozen Clay under Principal Stress Rotation

The Effect of Temperature on Dynamic Characteristics of Frozen Clay under Principal Stress Rotation

Stochastic Dynamic Response Analysis of the 3D Slopes of Rockfill Dams Based on the Coupling Randomness of Strength Parameters and Seismic Ground Motion

Pore Pressure Accumulation of Anisotropically Consolidated Soft Clay Subjected to Complex Loads Under Different Stress Paths

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