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Material A vs. Material B
Material A vs. Material B
Material B was found to be the cohesive material because the cohesion value is 3947.8 (kg/(m s2)), much higher than the value of Material A.
Given a normal force of 4000 pascals what will be the shear strengths of the two materials?
Material A y = 0.696x + 59.054
y = 0.696(4000) + 59.054 = 2843.054
y = 2843.054
Material B y = 0.7171x + 3947.8
y = 0.7171(4000) + 3947.8 = 6816.2
y = 6816.2
Relationships between the graphed data using mathematical formulation.
The data defines the relationship between the normal force and the shear strength in a linear pattern. The general formula for this pattern is y = mx + b. The specific formula for Material A is y = 0.696x + 59.054. The specific formula for Material B is y = 0.7171x + 3947.8. The friction angle for Material A is 34.7 degrees and for Material B is 31.4 degrees. Calculations are shown below.
Calculations for finding the friction angle for Material A and B.
Halloween Slide
Halloween Slide
Photograph of the October 31st, 2019 slide, looking up. (Photo taken on October 21st 2020)
Here we see all kinds of debris in the slide including pieces of sidewalk, old bricks, pieces of metal and other concrete pieces.
View of more debris from the landslide.
On October 31st there was a landslide that occurred on Riverside Avenue. We know from the landslide debris that most of what failed on the slope included fill and trash material, such as tires, metal and concrete.
Using the infinite slope model I was able to determine the effects of cohesion and water saturation on the hill slope. The slope along Riverside Avenue was compiled with multiple occurrences of dumping trash and fill. Because this fill was not compacted after the dumping occurred, the cohesion of the hill slope was very low. The small amount of trees that were seen at the toe of the landslide also did not aid in the overall cohesion of the slope. It should be noted that there is strong evidence for a landslide that occurred in the same location during an earlier date. Mounds of earth and debris, not part of the 2019 slide, are found below the toe of the landslide.
It is believed that the already unstable slope was on the verge of sliding and the heavy rainstorm on Halloween sent it over the edge. With 4 inches of rainfall in 24 hours, the hill slope became saturated to around 0.1 meters. This slope sits immediately off of Riverside Ave causing me to believe that the slope was feed more than the 4 inches of rainfall. The runoff from the road is likely to have caused an increase in the slope instability and became the driving factor for the failure of the slope.
Below are the parameters tested using the infinite slope model.
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