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Hi Everyone, The site consists of 5 to 6 m of very loose to loose liquefiable sand over bedrock with high groundwater. Will you consider drilled shafts or H piles for this site? The loadings of the building are relatively high and it’s somewhat sensitive to settlement And what should be...

Hi Everyone, There are various tables and formulas for bearing capacity of rocks. However they give very different numbers ranging from 3 MPa to 35 Mpa for the site that I am working on. 35 MPs is not a reasonable number to me but want to hear other opinions. The methods used are as simple of...

Hi Everyone, if a site with loose saturated sand and silt requires dewatering for construction, can dewatering be considered as a soil improvement method? Can bearing capacity, liquection resistance and soil parameters be increased provided that boreholes are drilled after dewatering to verify...

Hi everyone, what are limitations of NQ coring for geotechnical investigations? The structure is a light weight industrial structure which will be on piles penetrating to the rock and the client want to use NQ coring. Is there any limitations in type of information or tests that can be done on...

Hello, We are going to drill some boreholes for a pipe line under a shallow lake (4 m deep max.). What kind of geotechnical testing would be the best? Is SPT practical and will give reasonable results? what about shear vane? The proposal did not include any CPT testing and we should do...

Hi All, I am involved in a project that piles needs to be driven to bedrock. There is a 6 ft thick layer of cobbles and boulders just above the bedrock. Piles are H-piles with shoes and the QC include recording number of blows per 10". The drawings saying using Hiley formula for ultimate loads...

Hi All, I am planning an investigation for drilling in a relatively shallow lake (approx. 5 m of water and sediments at the bottom) to obtain permeability of bedrock. The rock will be in saturated condition and under head of water. To do packer test, some references are saying we should do...

Hi All, I am going to do packer tests to get permeability of rock below a small lake (approximately 5 m of water above the surface of bedrock). The drilling and test will be done from a barge. When I look at text books, I see below groundwater level a pump out test is better than a pump in test...

Hi All, Could you please share your thoughts about this project. The culvert and embankment was built few decades ago. The embankment is 7.5 m high and relatively steep at some areas, generally 1V:1H to 1V:2H. The underlying soil below embankment, problematic! : Soft Clay, SPT N=0 (sinking...

Hi All, My client wants to build a single house with walk-out basement at the toe of a slope. The house will be half on the sloping ground near the toe and half on flat zone at the toe. There is no water course and so on nearby. The slope is a little bit steeper than 3H:1V, based on topo and my...

Hi All, I am working on a small dam and would like to know what kind of sediment control I should consider for lowering the water in the dam. Any Canadian reference/regulation which I can refer to will be appreciated. Thank you

Hi All, I would like to have your thoughts about what would be a minimum factor of safety for a natural slope above a national railway. We are thinking about 1.3 instead of 1.5. The railway belong to Canadian National Railway, but I could not find any reference from CN Rail mentioning the FOS...

Hi All, Is there any way to tell if the soil is over-consolidated or normally consolidated just based on Atterberg results, moisture contents, SPT N-values and pocket penetrometer? Thanks for your answers,

Hi All, I have a client who wants to build a one storey small cottage near to a lake. I did geo investigation and encountered loose/very loose saturated sand up to more than 4 m. what would be the most cost effective foundation for this light structure? I was thinking of helical piles but would...

Hi all, Can anyone help me in preparing price estimate for earthwork for building a large embankment. I know how to get unit price for material and haulage from pits, but is there any rule of thumbs about how much placement, compaction, and QC will cost. The site is far from my area of work and...

Hi Everyone, I am currently involved with geotechnical investigation for a railroad embankment. Can you advise what should be the distance between holes and depth of investigation? What parameters are important and should be considered. The embankment is 11 m wide and 1.5 high and there are two...