Thermo-mechanical ratcheting in soil–structure interfaces

Pastén, Cesar; Castillo, Emilia; Chong, Song Hun

doi:10.1007/s11440-019-00816-8

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…Temperature fluctuations under conditions of biased forces are capable of causing geological materials to creep in accumulative plastic displacement [16]. Hence, it is assumed that rock blocks tend to creep on an inclined plane even without the wedge inside the joint, as also inferred by Gunzburgeret et al [6].…”

Section: The Role Of the Wedgementioning

confidence: 93%

Rock Slope Stability under Temperature Fluctuations

Bakun-Mazor¹

2023

Avantgarde Reliability Implications in Civil Engineering

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Air temperature fluctuations cause intermittent shrinkage and expansion of rock blocks close to the surface. These cyclic deformations can bring cumulative and irreversible displacement of blocks down rock slopes, creating potentially dangerous conditions. This chapter presents examples from stations monitoring various slopes and natural cliffs that illustrate this phenomenon. The chapter will also present the results of a laboratory experiment performed on a block system that simulates the typical geological structure of a slope in a stratified and cracked rock mass. Inside a tensile crack, a prismatic rock block serves as a wedge capable of accelerating the cumulative displacement. The results obtained from the laboratory measurements serve as a basis for calibrating analytical and numerical 3D models of the problem. The results of the laboratory experiment and the numerical models clearly show that the wedge is of great importance in accelerating the rate of movement of the blocks on the slope. Further numerical analysis performed on blocks on the slopes of Mount Masada shows that temperature changes alone could explain the blocks’ detachment from the slope.

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Section: The Role Of the Wedgementioning

confidence: 93%

Rock Slope Stability under Temperature Fluctuations

Bakun-Mazor¹

2023

Avantgarde Reliability Implications in Civil Engineering

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“…Moreover, after the first heating-cooling cycle, the residual slip is 0.358 mm (0.184 mm slip with gravity), and it accumulates to 1.744 mm after 10 cycles, and to 8.717 mm after 50 cycles, which is approximately 0.171 mm/cycle (Figure 14). Please be noted that the described features in the distributions of normal and stress forces and the slip values are also presented in [13] to some extent. As shown in those two cases of simulations, the magnitude of a residual slip is affected by the location of the neutral points.…”

Section: Theoretical Shear Strengthmentioning

confidence: 97%

Experimental and Numerical Studies on Thermally-Induced Slip Ratcheting on a Slope

Kim¹,

Kim

Zhang

et al. 2020

Infrastructures

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Mild temperature fluctuation of a material sitting on a slope may only cause a small slip, but a large number of the repeated temperature changes can amplify the magnitude of the overall slip and eventually bring an issue of structural instability. The slip accumulation starts from the minor magnitude and reaches the extensive level called “slip ratcheting”. Experimental evidence for such thermally-induced slip ratcheting is first provided in this work. It is implemented with an acryl sheet placed on an inclined wood with a mild angle; it is found that the temperature fluctuation of the acryl sheet causes the sheet to slide down gradually without any additional loading. The numerical model is then attempted to emulate the major findings of the experiments. From the simulation work, the location of a neutral point is found when the acryl plate is heated, and another neutral point is observed when cooled down. The shift of the neutral point appears to be a major reason for the unrecovered slip after a temperature increase and decrease cycle. Finally, a parametric study using the numerical model is carried out to examine which parameters play a major role in the development of residual slips.

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“…Though numerous efforts were made in thermal mechanical modeling, most existing models can only simulate the case of one thermal cycle and fail in describing the soil behavior under multiple heating-cooling cycles. As more attention has been paid to the long-term performance [11,12,25,26,27,40], the volume change and excess pore water pressure accumulation due to temperature variation can act as a significant factor influencing the safety of energy structures. Demars and Charles [23] reported a series of drained thermal cycle tests on high plastic marine clays and found that permanent reduction in void ratio (a function of over-consolidation ratio) gradually reduced due to temperature cycles (see Fig.1).…”

Section: Introductionmentioning

confidence: 99%

“…After four thermal cycles, the accumulation of excess pore water pressure was still increasing. Pastén et al [40] experimentally observed the thermally driven displacement accumulation with the number of temperature cycles and developed a thermally induced ratcheting mechanism for a smooth interface. All those observations show that multiple thermal cycles should be considered in thermal mechanical modeling of clays.…”

Section: Introductionmentioning

confidence: 99%

A two-surface thermomechanical plasticity model considering thermal cyclic behavior

et al. 2020

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In thermal-related engineering such as thermal energy structures and nuclear waste disposal, it is essential to well understand volume change and excess pore water pressure buildup of soils under thermal cycles. However, most existing thermomechanical models can merely simulate one heating-cooling cycle and fail in capturing accumulation phenomenon due to multiple thermal cycles. In this study, a two surface elasto-plastic model considering thermal cyclic behavior is proposed. This model is based on the bounding surface plasticity and progressive plasticity by introducing two yield surfaces and two loading yield limits. A dependency law is proposed by linking two loading yield limits with a thermal accumulation parameter nc, allowing the thermal cyclic behavior to be taken into account. Parameter nc controls the evolution rate of the inner loading yield limit approaching the loading yield limit following a thermal loading path. By extending the thermo-hydro-mechanical equations into the elastic-plastic state, the excess pore water pressure buildup of soil due to thermal cycles is also accounted. Then, thermal cycle tests on four fine-grained soils (natural Boom clay, Geneva clay, Bonny silt and reconstituted Pontida clay) under different OCRs and stresses are simulated and compared. The results show that the proposed model can well describe both strain accumulation phenomenon and excess pore water pressure buildup of finegrained soils under the effect of thermal cycles.

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Thermo-mechanical ratcheting in soil–structure interfaces

Cited by 4 publications

References 11 publications

Rock Slope Stability under Temperature Fluctuations

Rock Slope Stability under Temperature Fluctuations

Experimental and Numerical Studies on Thermally-Induced Slip Ratcheting on a Slope

A two-surface thermomechanical plasticity model considering thermal cyclic behavior

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