Publications
Effect of Static and Dynamic Loadings on Unsaturated Soil Slope Stability
Mar 25, 2020Journal AIP Conference Proceedings 2213, 020062 (2020)
Publisher Conference Chairman IConMEAS 2019
DOI 10.1063/5.0000254
The objective of This study is to find the effect of dynamic loads on slope stability. The parameters studied in this research are horizontal displacement of vibration, frequency, suction values and the form of slope failure. A laboratory model was manufactured in the form of a box with dimensions of ( 2000 X 1000 X 1450 )mm that slides on a rail installed on the ground and moved by a dynamically generated system. To explain the effect of dynamic load. three dynamic tests were performed. The one direction horizontal vibration displacement of the first, second and third tests are ( 10, 20 and 40 )mm respectively. Dynamic conditions were applied as a horizontal vibration at frequencies of ( 0.5, 1.0 and 2.0 )Hz. The time duration for each frequency value is ( 3 )minutes. The acceleration during vibrations was measured during the test with an accelerometer that was placed inside the soil and on the shaking table. The main results showed that the dynamic load was negatively affected in its slope bearing capacity. It decreased from ( 408 )kPa at the static test to ( 382.6, 306, 280.6 kPa ) at the three dynamic tests, respectively. On the other hand, the measured amount of initial negative pore water pressure (suction) of the layers (upper, middle and lower) was found to be ( 25,23,and21 ) kPa respectively. Results also showed that the suction values were slightly changed during the tests. The experimental results were compared with that obtained from numerical simulation using Geo Studio software. Experimental results are nearly identical to that obtained from numerical analyses.
Effect of Rainfall, Dynamic and static loading conditions on Unsaturated Soil Slopes Stability
Jan 2, 2021Journal Modern Applications of Geotechnical Engineering and Construction
Publisher Springer Singapore
DOI 10.1007/978-981-15-9399-4_6
Volume (pp.51-62)
This research was conducted to detect the effect of static load, dynamic condition and rainfall on slope stability. The studied parameters are: rainfall intensity, static load, frequency, soil suction variation and the form of slope failure. A laboratory model was manufactured in the form of a box with dimensions of ( 2000× 1000 × 1450 )mm that slides on a rail installed on the ground and moved by a dynamically generated system and provided with a controlled rainfall system. To clarify the rainfall effect with dynamic conditions on the slope stability, the effect of a rainfall intensities of (20, 30 and 40)mm/h were studied on a series of three model tests.Two stages of a rainfall (duration of each one = 1 hour) have been applied on the soil sample. After each stage, the model was left for 24 hours to allow water infiltration process into the soil layers. Dynamic conditions were enjoined as (20)mm of one direction horizontal vibration displacement at frequencies of ( 0.5, 1.0 and 2.0)Hz. The time duration for each frequency value is (3) minutes. The acceleration during vibrations was measured through the test by an accelerometer that was placed on a shaking table and inside the soil. The main result shows that the rainfall and dynamic load have negatively affected the slope bearing capacity. It decreased from(408)kPa at the static test to (204, 127 and 102)kPa at the three rainfall tests, respectively. On the other hand, results also revealed that the soil suctions were decreased after the application of rainfall on the slope model.
Numerical Investigation the Failure Mechanism of Left Slope of Darbandikhan Dam
Dec 1, 2020Journal Al-Rafidain Engineering Journal (AREJ)
Publisher Al-Rafidain Engineering Journal (AREJ)
DOI https://www.iraqoaj.net/iasj/pdf/467b398c28d1db53
Volume Vol.25, No.2 pp. 1-11
The aim of this research is to analyze the stability of the left shoulder slope of the Derbandikhan Dam failure due to rainfall and earthquake. This slope consists of unsaturated low plasticity clayey soil. All analyses were conducted by using the Geo-Studio program. The field survey was carried out for the study site and the soil samples were taken to perform the necessary laboratory tests to obtain the required soil properties. The field conditions (Rainfall and earthquake) were simulated, where the slope was exposed to rainfall at (24) mm / day intensity to various periods (10, 20, 30, 40, 50 and 60) days. A slope stability analysis was performed at end of each period. Moreover, another analyses were performed by exposed slope to an earthquake at end of each rainfall period. Safety factor reached to critical value (1) when slope was exposed to the earthquake after (20) days of rain.
Strengthening the Slope Beneath Bashtapia Castle at the Highest Expected Tigris River Level
Sep 13, 2023Journal E3S
Publisher E3S Web of Conferences 427, 01014 (2023)
DOI https://doi.org/10.1051/e3sconf/202342701014
Issue E3S Web of Conferences
Volume 427, 01014 (2023)
This study has been achieved using Geo-Studio Finite Element Software in two sections. First, to study the changes in pore water pressure (PWP) within the soil layers below Bashtapia Castle at different water levels of the river Tigris. The effect of these changes was in focus to check the slope stability of the Castle. On the other hand, the second section was to increase the safety factor using slope reinforcement using different spacings and lengths of the anchor’s rods. Modeling output showed that the factor of safety (FS) decreased from 2.83 to 0.838 when the water level raised from 0 to 7 m above the bottom slope layer. Accordingly, anchor bars were introduced in the model, and the safety factor increased. The slope layers were treated and strengthened using reinforcing anchor bars at different lengths and numbers. In general, the analysis results showed the positive effect of reinforcing bars on the stability of the castle slope. The FS of the slope castle increases with the increased length and number of anchors to a certain value, and then there is no effect of this increase on the FS value.