Seismic response of earth dams considering dynamic properties of unsaturated zone

Ariyan, M.; Habibagahi, Ghassem; Nikooee, Ehsan

doi:10.1051/e3sconf/20160908002

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…-the study in [41] investigates the displacement and acceleration in the upper part of the earth dam, and the stress state in the body of the dam, with and without considering the water saturation of soil. The calculations were conducted using the FEM and the FLAC program.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of earth dams under different kinematic impacts

Mirsaidov

Toshmatov²

2023

E3S Web of Conf.

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The paper provides a detailed analysis of the current state of the problem. A mathematical model is presented to determine the dynamic behavior of earth dams, considering the viscoelastic properties of soil, using the hereditary Boltzmann-Volterra theory with the A.R. Rzhanitsyn kernel under periodic kinematic impacts. To solve the problems considered, the finite element method and complex arithmetics were used to reduce integrodifferential equations to a high-order complex algebraic equation. The accuracy of the methods was verified by solving test problems. Steadystate forced vibrations of the Pskem earth dam 195 m high are studied considering the real geometry and soil properties under resonant vibration modes. It was stated that the largest stress amplitudes in the body of the dam occur not only under the first resonance, but they can occur under other dense spectra of the eigenfrequencies of the dam, due to the interaction between close natural modes of vibration. The strength of various sections of the dam body was tested under kinematic impact using the Coulomb- Mohr theory of strength; the most dangerous sections of the dam were identified in terms of the highest stress.

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Section: Introductionmentioning

confidence: 99%

Dynamic behavior of earth dams under different kinematic impacts

Mirsaidov

Toshmatov²

2023

E3S Web of Conf.

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“…The presence of unsaturated zones in earth structures such as earth dams considerably influences their seismic and dynamic behavior. [1][2][3] Furthermore, two-thirds of the earth's surface is covered by unsaturated soils, 4,5 and the top unsaturated soil layers influence the site response to the traveling seismic waves, the study of which requires an in-depth knowledge of saturation dependency of unsaturated soil dynamic and cyclic properties. The cyclic behavior of soils and their dynamic properties, such as shear modulus, have been studied substantially for dry and saturated conditions.…”

Section: Introductionmentioning

confidence: 99%

Cyclic modeling of unsaturated sands using a pore‐scale hydromechanical approach

Hosseinkhani

Habibagahi

Nikooee

2022

Num Anal Meth Geomechanics

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Determining proper strain-dependent shear modulus and damping ratio for soils is of utmost importance when investigating their response to cyclic loads. Experimental studies on the effect of the degree of saturation and suction on the shear modulus at large strain amplitudes are scarce due to the complexities involved in testing such soils. Furthermore, the previously presented micromechanical models for the cyclic behavior of unsaturated soils lack some of the required features of soil pore skeleton essential to model unsaturated soils' hydromechanical behavior. This paper is, thus, aimed at addressing this shortcoming by incorporating a pore-scale numerical method that couples the discrete element simulation of the solid phase and the fluid pore network to capture the cyclic behavior of unsaturated sands. To this end, the model is first calibrated to determine the micro-scale parameters using experimental results from static drained triaxial compression tests on dry and saturated sand samples. Next, the coupled model is employed to simulate the observed behavior during cyclic triaxial tests on unsaturated sands. A linear dependence of the plastic rolling coefficient and the interparticle friction angle on the degree of saturation is proposed from simulations of suction-controlled cyclic triaxial tests. Variation of shear modulus with shear strain amplitude and degree of saturation indicates a continuous increase in the shear modulus with the decrease in saturation. In contrast, the trend for the damping ratio is the opposite. Finally, closed-form relationships are proposed based on the simulation results for the shear modulus and damping ratio of unsaturated soils.

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“…Furthermore, software like 1D Plaxis was also used wholly to conduct the required numerical simulation to study and compare of some earth dam's failure after earthquakes [10], while the same software used also in term of 2D analyses in some similar cases [11]. In a related context, it is observed that some recent studies are extended to consider the unsaturated zones within dam body in the seismic response analyses [12].…”

Section: Introductionmentioning

confidence: 99%

Stability Assessment of Zoned Earth Dam under Water Particles Fluidity Effect: Hemren Dam as Case Study

Sammen

Majeed

2021

ARFMTS

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Recently the numerical modeling using finite element method is take into account as a very effective tool to investigate the desired behavior of structures in geotechnical engineering. Earth dams are a water retention structures that are normally wide constructed around the world due to its significant features. These structures may be failed due to exposure to an earthquake and this will result in disaster. The main objective of this study is to assess the slope stability and the seismic response of an earthen dam. Since the matter of seismic response is still have a considerable lack of information for earth dams as a unique structure. Hemren zoned earth dam that is located in Diyala governorate, northeast of Iraq that considered as an active seismic zone has been considered as case study. Numerical modeling has been done in this study using Geo studio software. Factor of safety was calculated with different water levels in order to evaluate the dam safety with different operation water level. The excited earthquake is Elcentro while three values of peak ground acceleration were used which are 0.2, 0.25 and 0.3 g and the duration time is scaled to 10 seconds. In addition, three key points (at the core, the shell and the foundation) that represent the dam construction material are used to evaluate the dynamic response within the dam body. The results revealed that the factor of safety is increased when the water level is increase, but in the increasing in the magnitude of factor of safety with water depths of (10 and 15) m was more than the other depth. The zone of the dam core shows a negative pore water pressure value. That leads to an increasing in effective stress at the core of the dam.

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Seismic response of earth dams considering dynamic properties of unsaturated zone

Cited by 5 publications

References 18 publications

Dynamic behavior of earth dams under different kinematic impacts

Dynamic behavior of earth dams under different kinematic impacts

Cyclic modeling of unsaturated sands using a pore‐scale hydromechanical approach

Stability Assessment of Zoned Earth Dam under Water Particles Fluidity Effect: Hemren Dam as Case Study

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