Soil Parameters
Soil Parameters
(OP)
If no further in-situ/lab testing can not be carried out, what could be an experienced engineer's assessment of the till materials investigated by test pitting to a depth of 4.5m.
The walls were stable until 2 hrs before ther pits were backfilled (refer to the attachment), no water was encountered and pocket penetrometer (although may not be accurate)on the excavated wall showed readings of more than 4.5 tsf.
Atterberg test showed the soil to be non plastic with LL = 13%. Moisture content of 9% and the till is expected to be clayeye silty sand sandy silt with gravels, cobbles and boulders. I have assumed a phi value of 50 but need to know how much could C be for shoring design.
The walls were stable until 2 hrs before ther pits were backfilled (refer to the attachment), no water was encountered and pocket penetrometer (although may not be accurate)on the excavated wall showed readings of more than 4.5 tsf.
Atterberg test showed the soil to be non plastic with LL = 13%. Moisture content of 9% and the till is expected to be clayeye silty sand sandy silt with gravels, cobbles and boulders. I have assumed a phi value of 50 but need to know how much could C be for shoring design.





RE: Soil Parameters
RE: Soil Parameters
RE: Soil Parameters
Be careful with open excavations in such soil. As with other granular soils, walls of excavation can suddenly collapse as moisture reduces from exposed face.
RE: Soil Parameters
RE: Soil Parameters