SciGeo
Geotechnical
- Apr 12, 2013
- 3
Hi all,
My colleague has made a one dimensional settlement estimation and has gone on 6 weeks leave and I cannot get the same result as him but am not confident in my result. Any help on where one I am wrong/right would be great.
We have 2m of sand overlying 1m of clay over rock. Water table is at 0.5m depth. We are adding 2.5m of fill to the site. I am trying to estimate settlement. It is concept design so does not have to be super detailed. Profile Follows:
2.5m Fill to be added to the site (Total Unit weight 20kN/m3)
2.0m Sand (Total Unit weight 19kN/m3)
1m Clay (Total Unit weight 18.2kN/m3), w=28%, Cc=0.6, Cr=0.1, Pre-consolidation Pressure =50kPa
Bedrock
I have attached my working out, I estimated approx 15mm of settlement compared to his estimation of approx 80mm. If someone could let me know if I am correct that would be great. Being a geologist rather than a Geotech Engineer I am rather hesitant to dismiss his calculation.
My colleague has made a one dimensional settlement estimation and has gone on 6 weeks leave and I cannot get the same result as him but am not confident in my result. Any help on where one I am wrong/right would be great.
We have 2m of sand overlying 1m of clay over rock. Water table is at 0.5m depth. We are adding 2.5m of fill to the site. I am trying to estimate settlement. It is concept design so does not have to be super detailed. Profile Follows:
2.5m Fill to be added to the site (Total Unit weight 20kN/m3)
2.0m Sand (Total Unit weight 19kN/m3)
1m Clay (Total Unit weight 18.2kN/m3), w=28%, Cc=0.6, Cr=0.1, Pre-consolidation Pressure =50kPa
Bedrock
I have attached my working out, I estimated approx 15mm of settlement compared to his estimation of approx 80mm. If someone could let me know if I am correct that would be great. Being a geologist rather than a Geotech Engineer I am rather hesitant to dismiss his calculation.
