The effect of instrumentation on the determination of the resilient modulus of unbound granular materials using advanced repeated load triaxial testing

Zhalehjoo, Negin; Tolooiyan, Ali; Mackay, R.; Bodin, Didier

doi:10.1016/j.trgeo.2018.01.003

Cited by 18 publications

(5 citation statements)

References 10 publications

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“…Figure 10 shows that the modulus of resilience, E ur , increased nonlinearly with increasing confining pressure. is behavior is similar to that of unbound granular materials and cementtreated mixtures [27,28], but it differs from the linear relationship between the modulus of resilience and the confining pressure of intact completely decomposed granite soils [14].…”

Section: Modulus Of Resiliencementioning

confidence: 69%

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

Yang

Shan

et al. 2021

Advances in Materials Science and Engineering

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Lean cemented sand and gravel (LCSG) materials are subjected to unloading-loading when an LCSG dam is opened for water drainage and then refilled or a roadbed base is subjected to repeated wheel loads. To investigate the behavior of the LCSG materials under loading-unloading, previous studies utilized the complete loading triaxial test. In contrast, in this study, the consolidated drained triaxial tests in the unloading and reloading paths for materials with cementing agent contents of 60 and 100 kg/m3 under different confining pressures, for which each curve generates three loading-unloading cycles, were applied to investigate the unloading and reloading mechanical behavior. Experimental results indicated that the unloading and reloading behavior of the LCSG materials produced stress-strain curves exhibiting a crescent-shaped hysteresis loop, which differs from that exhibited by coarse-grained soil. Although the shape of the crescent-like hysteresis loop was preserved as stress levels increasing, it gradually expanded. Compared with that of the typical triaxial test, the cohesive force and the increasing internal friction angle increased. Further, as the confining pressure increased, the crescent-like hysteresis loops tapered, shear strength increased linearly, and the modulus of resilience increased nonlinearly; the latter’s rate of change, however, decreased. The change in volumetric strain was small during unloading as the stress level changed.

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Section: Modulus Of Resiliencementioning

confidence: 69%

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

Yang

Shan

et al. 2021

Advances in Materials Science and Engineering

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“…Table 4 summarizes the range and average values of each parameter range and judgment coefficient in RLT tests. Current studies show that the N37A model takes into account the influence of bulk stress and shear stress on the MR [9]. It overcomes the problems of dimensional disunity and indefinite value of MR.…”

Section: Resultsmentioning

confidence: 99%

Effect of Maximum Particle Size on Resilient Modulus of Unbound Granule Materials by Repeated Load Triaxial Test

Yang

Zhu

Ding

2022

Advances in Transdisciplinary Engineering

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The unbound granule material (UGM) is widely applied as the base/subbase layer in pavement engineering. The poor quality of UGMs mainly result in differential settlement and fatigue failure of UGMs. This paper presents a laboratory investigation on the influence of the maximum particle size (MPS) of aggregates on the resilient modulus (MR) of UGMs. The repeated load triaxial tests were performed under different stress levels. Three nonlinear models were compared to describe the mechanical behavior of UGMs. The results show that the particle size plays a significant role in the MR of UGMs. When the MPS of UGMs increases from 19mm to 26.5mm, its dynamic MR increases by 6.8% on average. When the particle size increases from 26.5mm to 31.5mm, the dynamic MR increases by 13.3% on average. Meanwhile, the MR is also dependent on the deviatory stress and the confining pressure. The N37A model has a better goodness of fit than the others. In a word, it effects of the MPS should be taken into account in the pavement design, to make sure that the loading and deformation of pavement structure more uniform.

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“…Using the UGM specimens with moisture contents below OMC, Arulrajah et al [47][48][49] and Soliman [50] pointed out that the resilient modulus and the resistance of the plastic strain of UGMs under repeated loads declined with the increase in DOS. Zhalehjoo et al [51] and Cerni et al [52] also illustrated that the resilient modulus of UGMs declined with the increase in DOS under varied bulk stresses. Austroads [53,54] describes that the growth of traffic loading and the prediction of extreme weather should be the main requirement of the quality and strength characteristics of UGMs.…”

Section: Effect Of Dos On the Dynamic Response Of Ugmsmentioning

confidence: 93%

Influence of Degree of Saturation (DOS) on Dynamic Behavior of Unbound Granular Materials

Sun

Ong

2021

Geosciences

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The extensive application of natural unbound granular materials (UGMs) motivates studies into the mechanical properties of alternatives such as processed crushed rocks employed commonly as base or subbase layers. The rutting and settlement generated in base and subbase layers is widely restricted in many specifications and standards. In this research, the dynamic behavior including the resilient modulus () and the plastic strain () of the crushed rocks collected from Queensland in Australia will be tested by a series of repeated load triaxial test (RLT) tests to investigate the behavior of UGMs under the fluctuation of the degree of saturation (DOS) (59%–100%). In particular, the RLT specimens were prepared in the laboratory through proper gradation under optimum moisture content (OMC) and 100% standard proctor maximum dry unit weight. Results from the RLT tests showed that UGM specimens soaked at higher DOS generated lower resilient modulus and weaker resistance to heavy traffic volumes with significant accumulation of plastic strain. The and of the tested aggregates under different cyclic deviator stresses of 425 kPa and 625 kPa approximately linearly decreased and approximately linearly increased as the DOS increased with a certain number of cycles up to 50,000, respectively.

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The effect of instrumentation on the determination of the resilient modulus of unbound granular materials using advanced repeated load triaxial testing

Cited by 18 publications

References 10 publications

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

Effect of Maximum Particle Size on Resilient Modulus of Unbound Granule Materials by Repeated Load Triaxial Test

Influence of Degree of Saturation (DOS) on Dynamic Behavior of Unbound Granular Materials

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