Characterization of Shallow Soil Slopes in Greenville County, South Carolina
Kimberly Henning; Senior Geology Major; firstname.lastname@example.org
Advisor: Scott Brame
Materials and Methods
Having mastered the the requisite skills to operate the software, the site specific data collection described below will be conducted this fall and entered into SINMAP. Six cores will be collected from Caesar’s Head and Jones’ Gap State Parks. The Caesar’s Head cores will be referred to as cores CA(1-3) and CB(1-3) and Jones’ Gap cores will be referred to as cores JA(1-3) and JB(1-3). The core samples will be tested for shear strength, soil composition, parent material, and permeability.
After obtaining a research permit to collect samples in Jones’ Gap and Caesar’s Head, the following steps will be taken.
- A one-to-two foot opening is dug onto the side of an idenified shallow soil slip to provide a work base.
- One foot long, three inch diameter cores (A) and six inch long, two inch diameter cores (B) are hammered into each working base site and removed once the soil is compacted.
- These are taken to the lab where they are cut, opened, and photographed.
Each core will undergo direct shear analysis.
- The CA(1-3) and JA(1-3) cores are all trimmed to a cylinder of 2.5” diameters and 1” length. They must fit into the direct shear machine in order to be tested.
- Each core is placed into a direct shear machine and sheared at normal stresses of 500 psi, 1000 psi, and 2000 psi to get the effective shear strength at failure.
Each area that a core is taken from will also undergo soil tests through the agriculture services lab in Clemson, SC.
- A standard soil test including tests for pH, buffer pH, extractable phosphorus, potassium, calcium, magnesium, zinc, manganese, copper, boron, sodium, and lime requirements and recommendations. Calculations for cation exchange capacity, acidity, and percent base saturation are also included per the soil testing website.
- An organic matter test will also be conducted.
- The soil testing lab recommends these steps to collect a sample (2):
- Use a soil auger, spade, or shovel. Samples from cultivated areas should be taken from the surface to a depth of 6 to 8 inches. Samples from pasture or turf should be taken only 2 to 4 inches deep.
- Soil cores should be approximately the same size throughout their depth. No adjustments are needed if using a soil probe. To do this when using a spade or shovel, take a thin slice from the side of a V-shaped hole. Take sub-samples from at least 12 locations within the sample area.
- Place the sub-samples in a clean plastic bucket and mix thoroughly.
- Do not heat a moist soil sample to dry. Spread it out on newspaper and let air dry overnight. Crumble and mix before it hardens.
- Label or number the soil bag. Fill bag to fill line (the equivalent of 1 – 2 cups). Do not use the same number for more than one sample.
- Use digital elevation model (DEM) of South Carolina to begin creating SINMAP.
- Use information from core samples and soil samples to validate or update input information from DEM.
- Run SINMAP program.