@article{akin_akinleye_robichaud_2023, title={Changes in Soil Properties over Time after a Wildfire and Implications to Slope Stability}, volume={149}, ISSN={["1943-5606"]}, DOI={10.1061/JGGEFK.GTENG-11348}, abstractNote={Postwildfire forests are dynamic environments. Wetting-induced shallow landslides are observed at varying times after wildfires, but the reasons are not fully known. This study investigates the time-dependent changes in soil properties and mechanical and hydrologic soil behavior of hillslopes after the 2019 Williams Flats Wildfire near Keller, WA and demonstrates the implications of these changes to slope stability. Soil water repellency, organic content, fine content, soil water retention curve, hydraulic conductivity, friction angle, and in-situ suction-saturation data provides initial evidence that soil properties fluctuate over a year after the wildfire. The results therefore suggest that soil properties that are measured immediately after the wildfire are misleading for long-term slope stability analysis. The stability of a steep (45°) slope is found to be most affected by the fluctuations in friction angle and soil water retention over the year. The comparison of suction-saturation response near a burned and unburned location demonstrates the effects of macropores that are formed after the wildfire and evapotranspiration on slope stability. The hillslope stability at the unburned location reduces rapidly in April upon snowmelt, whereas the stability at the burned location, which has macropores, shows the rapid decrease in late-January, with the onset of snowfall.}, number={7}, journal={JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING}, author={Akin, Idil Deniz and Akinleye, Taiwo O. O. and Robichaud, Peter R. R.}, year={2023}, month={Jul} }
 @article{akin_tirkes_collins_2023, title={Geotechnical insights of mammal burrows in loose desert sand}, ISSN={["1861-1133"]}, DOI={10.1007/s11440-023-02000-5}, journal={ACTA GEOTECHNICA}, author={Akin, Idil Deniz and Tirkes, Sera and Collins, Clint E.}, year={2023}, month={Jul} }
 @article{barzegar_wen_mivehchi_akin_edil_2023, title={Investigation of excessive settlement involving recycled asphalt pavement in highway embankment}, volume={40}, ISSN={["2214-3912"]}, DOI={10.1016/j.trgeo.2023.100991}, abstractNote={Recycled asphalt pavement (RAP) refers to unprocessed (e.g., milled) or processed (e.g., screened) asphalt mixtures obtained from roadways or other resources. The use of in-situ RAP is a sustainable practice that potentially could contribute to reduced greenhouse emissions and costs as well as accelerating the construction process. However, it has been reported that some pavements that utilize RAP as embankment/fill material experienced excessive settlement soon after construction. In order to investigate this issue, a comparison between RAP samples from five sources in Illinois and two conventional soils was conducted. Laboratory experiments included basic soil/RAP characteristics, gradations, moisture-density relationships at different temperatures, permeability, and pilot drainage, one-dimensional consolidation tests, and settlement analysis. The results indicate that RAP, considered as a permeable material, should not be used directly underneath the pavement drainage layer, as it can act as a reservoir and saturate the underlying embankment soils, which leads to excessive settlement of the embankment. Results show that the increase in the temperature of the RAP increases the one-dimensional compression. Also, it is recommended that the settlement analysis during design stage should consider the potential settlement of embankment soil from as-compacted condition to saturated condition.}, journal={TRANSPORTATION GEOTECHNICS}, author={Barzegar, Mohammadreza and Wen, Haifang and Mivehchi, Maziar and Akin, Idil Deniz and Edil, Tuncer}, year={2023}, month={May} }
 @article{barzegar_wen_akin_edil_2023, title={Laboratory Assessment of Recycled Asphalt Pavement as Roadway Embankment Material}, ISSN={["2169-4052"]}, DOI={10.1177/03611981221151025}, abstractNote={ Rehabilitation or reconstruction of roadways produces a large amount of recycled asphalt pavement (RAP). Typically, RAP is often reused as a part of hot mix asphalt. However, the in situ utilization of RAP offers advantages such as reduction of construction cost and expedition of construction process. On the other hand, including considerable percentages of RAP as a fill material in the embankment of pavement structures may increase the risk of settlement. In this study the behavior of RAP samples from five sources in Illinois, two conventional soils, and a lab-produced mixture of soil and RAP is investigated. Gradations, moisture–density relationships, dynamic triaxial, direct shear and one-dimensional consolidation tests at various conditions were performed. Results show that an increase in the temperature of RAP during compaction significantly increased the maximum dry density (MDD). Also, the mixed sample of soil and RAP results in the highest standard Proctor MDD. Increase in temperature significantly increased the compression of RAP. Achieving good settlement performance for RAP is feasible if the RAP samples are screened to pass 1.5-in. sieve and if the compaction of the RAP samples reaches 100% of standard MDD. Based on the dynamic triaxial testing, deformation of RAP does not stabilize as soils do. To mitigate this issue, it is recommended not to use RAP within the influence zone of traffic load, specifically the top 5 ft of an embankment in a rigid pavement structure and within the top 8 ft of an embankment in a flexible pavement structure. }, journal={TRANSPORTATION RESEARCH RECORD}, author={Barzegar, Mohammadreza and Wen, Haifang and Akin, Idil Deniz and Edil, Tuncer}, year={2023}, month={Feb} }