Solve this geotechnical engineering question using the data and formula provided With hand written working out A

Solve this geotechnical engineering question using the data and formula provided
With hand written working out
 

 

Transcribed Image Text:

A soil layer in a humid climate with the following properties is given. Provide comments on the potential movement (expansiveness tendency) of this soil, based on clay activity, ground movement, swell pressure, placticity index and linear shinkage. Simply state: the potential movement is high, intermidiate or low. 1. Liquid Limit (LL) = 80% 2. Plastic Limit (PL) = 28% 3. Clay Content = 30% 4. Linear Shrinkage (LS) = 19% 5. Average Soil Suction (S) = 500 kPa 6. Air Entry Suction (Sat) = 100 kPa 7. Ground movement (y.) = 58 mm Generally: Soil is classified as highly expansive if its swell pressure exceeds 200 kPa. Soil is classified as having intermediate expansiveness if its swell pressure is greater than 100 kPa but less than 200 kPa. Soil is classified as having low expansiveness if its swell pressure is greater than 50 kPa and less than 100. Soil is classified as not expansive or having very low expansiveness if its swell pressure is less than 50 kPa. Ac Clay Activity Pl % Clay Content LL-PL or % <2m Classification Activity Range As 0.75 Inactive 0.75 30 >12 >50 >18 40-60mm Highly reactive clay sites, which may experience very high ground movement from moisture changes 60-75mm Extremely reactive sites, which may experience extreme ground movement from moisture changes >75mm Sites which include filled sites (refer to AS 2870 2.4.6), soft soils, such as soft clay or silt or loose sands; landslip; mine subsidence, collapsing soils; soils subject to erosion reactive sites subject to abnormal moisture conditions or sites which cannot be classified otherwise. A soil layer in a humid climate with the following properties is given. Provide comments on the potential movement (expansiveness tendency) of this soil, based on clay activity, ground movement, swell pressure, placticity index and linear shinkage. Simply state: the potential movement is high, intermidiate or low. 1. Liquid Limit (LL) = 80% 2. Plastic Limit (PL) = 28% 3. Clay Content = 30% 4. Linear Shrinkage (LS) = 19% 5. Average Soil Suction (S) = 500 kPa 6. Air Entry Suction (Sat) = 100 kPa 7. Ground movement (y.) = 58 mm Generally: Soil is classified as highly expansive if its swell pressure exceeds 200 kPa. Soil is classified as having intermediate expansiveness if its swell pressure is greater than 100 kPa but less than 200 kPa. Soil is classified as having low expansiveness if its swell pressure is greater than 50 kPa and less than 100. Soil is classified as not expansive or having very low expansiveness if its swell pressure is less than 50 kPa. Ac Clay Activity Pl % Clay Content LL-PL or % <2m Classification Activity Range As 0.75 Inactive 0.75 30 >12 >50 >18 40-60mm Highly reactive clay sites, which may experience very high ground movement from moisture changes 60-75mm Extremely reactive sites, which may experience extreme ground movement from moisture changes >75mm Sites which include filled sites (refer to AS 2870 2.4.6), soft soils, such as soft clay or silt or loose sands; landslip; mine subsidence, collapsing soils; soils subject to erosion reactive sites subject to abnormal moisture conditions or sites which cannot be classified otherwise.