Experimental study of the role of interface element in earth dams with asphalt concrete core - Case study: Mijran dam

Noroozi, Ashkan Gholipoor; Ajalloeian, Rassoul; Bayat, Meysam

doi:10.1016/j.cscm.2022.e01004

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…Janipour et al 17 investigate the interface shear strength characteristics between soil and concrete under static loads. Noroozi et al 18 evaluated the mechanical behavior of the interface between the filter soil material and the asphalt concrete core in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on shear characteristics of the silty clay soil-ice interface

Huang

Mao

et al. 2022

Sci Rep

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During the spring thawing, the decrease of soil-ice interface strength by temperature may lead to slope instability. For this reason, some researchers have explored the relationship between temperature and soil-ice interface strength. However, previous studies have not systematically explored the change law of strength at the soil-ice interface from negative temperature to 0 °C. Therefore, direct shear tests were conducted at different shear temperatures and different moisture contents. The effects of temperature and moisture content on strength, cohesion, and internal friction angle are analyzed, while the shear failure mechanism of specimens at different temperatures is discussed according to the location of the shear failure surface. The results show that: Shear properties of soil ice specimens are related to the unfrozen moisture content. The strength of the sample decreases with increasing temperature, and the change in strength is most significant from − 2 to − 0 °C. The strength reduction in this range is from 21.8 to 74.8%, and the higher the moisture content the more obvious this phenomenon is. The shear index tends to decrease with the increase of unfrozen water content, and the greater the increase of unfrozen water, the faster the decrease of both, especially in stage 2. When the temperature is higher than − 5℃, the failure surface is located above the soil-ice interface, and the strength of the specimen is similar to that of the frozen soil. When the temperature is − 10℃, the shear damage surface appears at the soil-ice interface, and the strength of the specimen is determined by the strength of the soil-ice interface.

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Section: Introductionmentioning

confidence: 99%

Experimental study on shear characteristics of the silty clay soil-ice interface

Huang

Mao

et al. 2022

Sci Rep

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“…At present, the research on the shear characteristics of ACC by scholars at home and abroad is mainly summarized into two aspects, namely model test and numerical simulation. On the one hand, in the model experiments, the mechanical properties of the core are mainly studied by the shear effect of the two interfaces [4] . Tajdini et al (2014) [5] considered the interface between mortar and asphalt concrete under dry and saturated conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of joint form on shear characteristics of asphalt concrete core under steep bank slope condition

Li,

Liu

et al. 2024

Preprint

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The connection performance between the core and the concrete plinth under steep bank slope conditions is related to the overall seepage safety of the dam. In this study, combined with the actual engineering, the steep slope control groups with slopes of 71°, 76° and 81° were designed. The research scheme not only considers the limit situation of the existing specifications, but also makes further exploration on the situation of high and steep valleys beyond the specifications. Considering the asymmetric valley and the symmetric valley, two contact forms of arc joint and flat joint are set up. Based on the numerical calculation, the influence of the joint embedding depth and the amplification angle on the shear action of the asphalt concrete core (ACC) is quantitatively studied. The results indicate that the symmetry of the valley will cause stress to deflect, affecting the characteristics of shear stress of the core. Under the condition of high-steep bank slope, large shear deformation occurs at the joint of ACC, and significant arching occurs near the bank slope. The overall stress level of the arc joint is higher than that of the flat joint, and it is highly sensitive to the change of the bank slope. Increasing the embedded depth of the joint, the local shear effect of the core wall becomes larger. As the joint magnification angle decreases, the stress level of the core and the maximum shear stress decrease. Expanding the contact surface of the joint can reduce the shear effect of the core. This study breaks through the conventional dam construction conditions and explores the mechanical properties of anti-seepage bodies in high and steep valleys. The research results of this paper can provide reference for the design of ACC joints under extreme steep bank slope conditions.

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“…Conversely, when the temperature exceeded 0 °C, the asphalt concrete demonstrated stress-hardening characteristics. Noroozi et al [ 26 ] determined that temperature exerted a significant effect on the dynamic elastic modulus of asphalt concrete, with the modulus decreasing as the temperature increased. Cheng et al [ 27 ] underscored the necessity of the tailored design and construction of asphalt concrete under different temperature conditions, as its performance varies accordingly.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Asphalt Static Conditions on the Tensile Properties of Acidic Aggregate Hydraulic Asphalt Concrete

Bao,

He,

Wang

et al. 2024

Materials

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Hydraulic asphalt concrete is known for its excellent seepage control performance and strong deformation resistance. This engineering material has widespread applications in the seepage control structures of hydraulic buildings. Recent projects have investigated the use of acidic aggregates to improve economic efficiency. However, they have also highlighted the weaker adhesion between acidic aggregates and asphalt, which necessitates stringent construction process control. This study investigates the impact of resting conditions on the tensile properties of acidic aggregate hydraulic asphalt concrete. The results of the tensile testing indicate that the storage time significantly affects the performance of asphalt concrete. The tensile strength of the specimens without anti-stripping agents decreased from 1.711 MPa to 0.914 MPa after resting periods of 0, 10, 20, and 30 days. The specimens treated with anti-stripping agents also showed a decrease in tensile strength over time, similar to the trend observed in the previous specimens. Digital specimen simulations indicated a decrease in cohesion between the asphalt and the aggregate from 5.375 MPa to 2.664 MPa after 30 days, representing a reduction of 50.44%. To counteract the effect of the storage time on the bonding between acidic aggregates and asphalt, this study recommends reducing the grading index and maximum size of aggregates, decreasing the coarse aggregate content, and selecting smooth aggregate shapes.

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Experimental study of the role of interface element in earth dams with asphalt concrete core - Case study: Mijran dam

Cited by 7 publications

References 17 publications

Experimental study on shear characteristics of the silty clay soil-ice interface

Experimental study on shear characteristics of the silty clay soil-ice interface

Influence of joint form on shear characteristics of asphalt concrete core under steep bank slope condition

Study on the Effect of Asphalt Static Conditions on the Tensile Properties of Acidic Aggregate Hydraulic Asphalt Concrete

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