Investigation of Geohazard Potential of Highway Embankment Slopes on Expansive Clay by Using Geophysical Methods

Hossain, J.; Hossain, S; Lozano, Nicasio; Khan,; Kibria, Golam

doi:10.1061/9780784412121.066

Cited by 3 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many researchers investigated the mechanism of crack development in highly plastic expansive soils resulting from different unsaturated hydraulic conductivity in the lab and the field ( 31 – 33 ). Moreover, highly plastic clay soil develops desiccation cracks.…”

Section: Crack Mitigationmentioning

confidence: 99%

Unsaturated Hydraulic Conductivity Variation of Expansive Yazoo Clay with Wet-Dry Cycles

Ivoke

Khan

Nobahar

2021

Transportation Research Record

View full text Add to dashboard Cite

Expansive soils are subjected to shrink-swell behavior with moisture variation in Mississippi, United States. With successive moisture and temperature variations over the seasons, the hydraulic conductivity of expansive soil is subjected to change because of the development of shrinkage cracks, which can be as large as as 1.2 cm wide and 1.5 m deep in the field, affecting the vertical hydraulic conductivity (Kv), whereas the horizontal hydraulic conductivity (Kh) remains fairly constant. The current study intends to investigate the hydraulic conductivity of highly expansive Yazoo clay at different wet-dry cycles. To observe the changes in the hydraulic conductivity with different wet-dry cycles in the laboratory, an instantaneous profile method to measure the permeability was utilized. Compacted Yazoo clay samples at different initial moisture content instrumented with moisture sensors at different depths to monitor changes in the moisture content were investigated. The samples were subjected to one, two, and three numbers (1N, 2N, and 3N) of wetting and drying cycles. For the drying process, testing chambers are kept in a controlled high-temperature booth of about 37°C simulating high summer temperatures in Mississippi. After the end of the wet-dry cycles, the test is performed to investigate the changes in the hydraulic conductivity of soil with the presence of shrinkage cracks. The hydraulic conductivity of highly plastic clay is very low at a fully compacted state and was observed to be (1.0×10-8 cm/s) at the 1N wetting phase. However, with an increment in the wet-dry cycles, the Kv of Yazoo clay increases (3.70×10-4 cm/s) after the sample is exposed to three wet-dry cycles. Even though the changes in the Kv of highly plastic clay define the infiltration behavior, which mostly controls the slope failure and pavement distress, consideration of the climatic loads is ignored in the design phase of the highway embankment and levees. By inclusion of the climatic variation, and evaluating the performance, the design life and resilience of the structures can be significantly increased

show abstract

Section: Crack Mitigationmentioning

confidence: 99%

Unsaturated Hydraulic Conductivity Variation of Expansive Yazoo Clay with Wet-Dry Cycles

Ivoke

Khan

Nobahar

2021

Transportation Research Record

View full text Add to dashboard Cite

show abstract

“…A previous study indicated that the dominant mineral of the soil is montmorillonite mineral, which has high shrink/swell characteristics ( 13 ). It should be also noted that the average effective strength parameters of the Eagle Ford formation are 0.4 Mpa for the cohesion and 24° for the friction angel ( 14 ).…”

Section: Project Backgroundmentioning

confidence: 99%

“…To evaluate the performance of the reinforced slopes and to monitor the horizontal displacement, inclinometers were installed after the completion of field installation in Reinforced Section 1 and Reinforced Section 2. Hossain and Ahmed et al ( 14 , 15 ) conducted a study on the same slope to investigate the variations of the moisture content and matric suction. During the study, moisture sensors and Tensiometers were installed at the crest and the middle of the slope.…”

Section: Instrumentation and Performance Monitoringmentioning

confidence: 99%

See 1 more Smart Citation

Stabilization of the Highway Slope using Recycled Plastic Pins

Khan

Hossain

Nobahar

2021

Transportation Research Record

View full text Add to dashboard Cite

The recycled plastic pin (RPP) is made from recycled plastics and waste materials (i.e., polymer, sawdust, fly ash, etc.). It is a lightweight material and is less susceptible to chemical and biological degradation than the alternative reinforcing element. RPPs are driven into the slope face and provide additional resistance along the slip surface which increases the factor of safety against shallow slope failure. The current paper summarizes a case study using RPPs to repair highway slopes, investigating the use of a finite element method, and summarizes a design method. The highway slope was located over US 287 near the St. Paul overpass in Midlothian, Texas. The surficial movement had taken place over the slope, resulting in cracks over the shoulder near the bridge abutment. Three 15.2-m sections over the slope were reinforced using RPPs. After RPP installation, the slope was instrumented with inclinometers, rain gauges, moisture sensors, and water potential probes, and was monitored periodically. The performance monitoring results indicated that RPP provides resistance in the slope constructed using highly plastic clay. Further analysis of the slope using finite element analysis indicates that RPP can significantly improve the marginal slopes to a factor of safety more than 2.0. Finally, a simple design chart is presented to calculate the capacity of RPPs for slope repair design using an infinite slope approach.

show abstract

“…The approximate failure plane was identified at a depth of 6-7 ft from the site investigation results (Hossain et al, 2012). Based on the site investigation results, it was found that intrusion of rain water through cracks along the pavement shoulder and subsequent wetting and drying cycles of weather created a fully softened zone which ultimately causes the slope to fail.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling for Remedial Measures of Shallow Slope Failure Using Recycled Plastic Pins

Hossain

Hossain²

2012

GeoCongress 2012

Self Cite

View full text Add to dashboard Cite

Highway embankment in North Texas is constructed mainly on expansive clays. However, due to wetting and drying cycles over years, clayey soil in embankments are expected to change their engineering characteristics. Therefore, sloughing and shallow slope failures are predominant in North Texas area and posses a significant maintenance problem for Texas Department of Transportation (TxDOT). Recycled Plastic Pins (RPP) had been utilized in other states (Missouri, Iowa) as a cost effective solution for slope stabilization compared to conventional slope stabilization methods. The objective of this paper is to investigate the possibility of utilizing RPP for slope stabilization in Texas. The slope failure mechanism and stabilization of slope using RPP will be modeled and presented here. The finite element program PLAXIS was used for the modeling. Based on the numerical modeling, the factor of safety without RPP is 1.01. For different RPP spacing, the factor of safety of the modeled slope varies between 1.4 and 1.8. The preliminary results indicate that recycled plastic pins can be utilized for shallow slope failure to increase the stability of soil slope.

show abstract

Investigation of Geohazard Potential of Highway Embankment Slopes on Expansive Clay by Using Geophysical Methods

Cited by 3 publications

References 3 publications

Unsaturated Hydraulic Conductivity Variation of Expansive Yazoo Clay with Wet-Dry Cycles

Unsaturated Hydraulic Conductivity Variation of Expansive Yazoo Clay with Wet-Dry Cycles

Stabilization of the Highway Slope using Recycled Plastic Pins

Numerical Modeling for Remedial Measures of Shallow Slope Failure Using Recycled Plastic Pins

Contact Info

Product

Resources

About