Numerical study using stiffness parameters on the nonlinear behavior of RCA pavements under heavy traffic loads

Akbaş, Merve; Özaslan, Bilal; Khanbabazadeh, Hadi; İyisan, Recep

doi:10.1016/j.trgeo.2021.100582

Cited by 8 publications

(6 citation statements)

References 34 publications

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“…The disadvantage of ordinary anchor cable relative to NPR anchor cable is that its deformation is small, and under the condition of large deformation or impact of surrounding rock, the anchor cable is damaged due to excessive deformation [17]. NPR anchor cable can not only adapt to large deformation surrounding rock, but also provide effective high constant resistance.…”

Section: Construction Of Npr Anchor Cable Constitutive Modelmentioning

confidence: 99%

Numerical Simulation Research on Optimization of Large Deformation Control Parameters in Layered Slate Tunnel

Guo

2022

Wireless Communications and Mobile Computing

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In order to explore the deformation characteristics of layered slate tunnels under different dip angles of rock formations, a numerical simulation research method for optimization of large deformation control parameters of layered slate tunnels is proposed. The plane deviation, plane deformation, and DP parameters of the structure are obtained through the calculation mode. When studying the effect of overlapping rock masses on the stability of thick tunnels, the incidence angle of the rock structure is assumed to be zero. The estimated thicknesses of the dolomite limestone surrounding the tunnel are 0.3 m, 0.4 m, 0.5 m, 0.6 m, 0.7 m, 0.8 m, and 0.9 m, respectively. Select the vertical displacement to be analyzed as the result of the calculation. In order to study the influence of the structural slope on the tunnel stability, the thickness of the rock layer was 0.6 m, and the structural slopes of 5°, 15°, 30°, 45°, 60°, 75°, and 85° were used for simulation calculations. During on-site construction, focus on monitoring the tunnel section deformation before the secondary lining construction. Every 10-20 m, when the surrounding rock changes, the observation section of the enclosure convergence and vault settlement is arranged, and the peripheral displacement rate and the vault settlement rate are calculated according to the observed deformation. The results show that the vertical displacement of the top of the tunnel is generally in a “V” shape, that is, the maximum settlement in the tunnel; when the layer thickness is 0.3 m, the maximum vertical displacement of the rock layer is 7.2 mm, and the total settlement in the lining support tunnel is 8.23 mm. When the layer thickness is 0.9 m, the vertical displacement of the rock layer is 5.14 mm, and the total settlement in the lining support tunnel is 5.22 mm2; when the layer thickness was changed from 0.9 m to 0.3 m, the maximum vertical displacement of the rock layer increased by 140%, and the settlement at the vault increased by 158%. At this time, the focus of tunnel support is on both sides of the lining structure and the vault with large vertical settlement. The phenomenon that the section of YK51+032 first decreases and then increases due to the sudden appearance of mud in the surrounding YK51+040, resulting in increased short-term deformation. Only the ZK49+356 section at the entrance of the left line has a large deformation due to the thin overlying stratum, and other sections are relatively consistent, indicating the reliability of the calculation results.

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Section: Construction Of Npr Anchor Cable Constitutive Modelmentioning

confidence: 99%

Numerical Simulation Research on Optimization of Large Deformation Control Parameters in Layered Slate Tunnel

Guo

2022

Wireless Communications and Mobile Computing

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“…According to previous studies [163][164][165][166], RCA is directly applied to various ment layers, such as the surface, subgrade, and base, as well as rigid pavements [167 In addition to treatment efficiency, RCA's treatment cost and environmental impact are important for its wide-scale application [148][149][150]. The use of RCA as an alternative to NA in the manufacturing of concrete can alleviate the environmental impact of the extraction of NA resources, carbon emissions, and greenhouse-gas emissions [17,34,[36][37][38]151].…”

Section: Using Rca In Concrete Pavement Layersmentioning

confidence: 99%

“…According to previous studies [163][164][165][166], RCA is directly applied to various pavement layers, such as the surface, subgrade, and base, as well as rigid pavements [167][168][169]. The replacement of NA with RCA for pavement layers can save limited NA resources, thus decreasing water consumption by about 10%, reducing energy consumption by about 20%, and reducing CO 2 emissions by about 15%, all of which are associated with pavement construction [166][167][168].…”

Section: Using Rca In Concrete Pavement Layersmentioning

confidence: 99%

Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Han

Zhao²,

et al. 2023

Buildings

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In the construction industry, natural aggregates (NA) can be replaced by recycled concrete aggregates (RCA), which can address the issue of construction-waste disposal and resolve the dilemma between demand and supply. This paper aims to systematically review the modification of RCA techniques and their application in producing recycled aggregate concrete (RAC). First, the pretreatment approaches for enhancing the properties of RCA are introduced. Next, the improved efficiency of these approaches and their influences on the workability, mechanical strengths, and permeability of RAC are analyzed and discussed. Subsequently, the effectiveness of different techniques and their cost/environmental impact are compared. Finally, some case studies of the application of RCA in infrastructure are presented, and the remaining challenges and perspectives are discussed. The results of this review work can extend the knowledge of RCA and RAC, as well as serving as a source of inspiration for further studies.

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“…It is not sufficient to evaluate the long-term performance of coarse-grained filling materials under cyclic loading using only the resilient modulus; the plastic deformation test results should also be considered 43 . For this reason, the samples were subjected to plastic deformation tests and the results were evaluated together with the elastic modulus test results.…”

Section: Experimental Studymentioning

confidence: 99%

“…41 , the MR values of both subbase and base RCA samples were lower than those of NA samples. A study by Yilmaz 72 determined that MR values of natural aggregates typically found in different parts of Turkey vary between 70 and 385 MPa, and another study by Akbas et al 43 determined that RCA samples obtained from Turkey have MR values between 60 and 430 MPa. It appears from these values that the MR values found to be 41–420 MPa and 51–431 MPa in this study for samples prepared from RCA and NA, respectively, are consistent.…”

Section: Experimental Studymentioning

confidence: 99%

The effect of RCA pavements on the liquefaction-induced settlement

Akbaş¹,

Subasi²,

İyisan³

2023

Sci Rep

Self Cite

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The use of recycled concrete aggregates (RCA) not only reduces the demand for natural aggregates (NA) but also might improve the behavior of soil under earthquake loading. In this study, the behavior of the pavement constructed using 100% RCA and NA on a sandy soil layer with high liquefaction potential under dynamic loads was investigated by numerical analysis and compared with free field conditions. For this purpose, first, the classical geotechnical properties of 100% RCA and NA materials were obtained, and then the stiffness properties were determined by resilient modulus and permanent deformation tests. In the second stage, three different models were created with pavement with NA and RCA and without pavement on high liquefaction potential sand, and dynamic analyses were carried out by PM4Sand. Numerical analyses show that constructing a subbase and base layers significantly reduces liquefaction-induced settlement on the surface of flexible pavements built on liquefied soils. Moreover, when the case of using RCA instead of NA in the subbase and base layers built on the liquefied soil is examined, the liquefaction-induced settlement values on the surface are obtained either lower or very close. Consequently, this study proposes a new alternative to the use of RCA waste materials instead of NA. It is expected the use of these waste materials will reduce the need for storage space and also reduce the negative environmental effects associated with storage.

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Numerical study using stiffness parameters on the nonlinear behavior of RCA pavements under heavy traffic loads

Cited by 8 publications

References 34 publications

Numerical Simulation Research on Optimization of Large Deformation Control Parameters in Layered Slate Tunnel

Numerical Simulation Research on Optimization of Large Deformation Control Parameters in Layered Slate Tunnel

Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

The effect of RCA pavements on the liquefaction-induced settlement

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