Bore holes

[Muhammad Hashmi]

Assalam O Alykum all

Is the any code that specifies that the location, numbers, center to center distance and depth of bore hole? shall be minimum up to that range ?

Does it also depend on the number of stories or area? Or it is purely based on engineering judgement and experience. How can we mark the location of bore holes other than seeing the heavy loaded areas? In the bore hole location plan.

 BS code 8002 specify that, the number of boreholes, or other form of investigation, should be adequate to establish the ground conditions along the length of the wall and to ascertain the variability in those conditions. The centers between boreholes will vary from site to site but should generally be at intervals of 10 m to 50 m along the length of wall.

Will be thankful if seniors can comment on this

[UmarMakhzumi]

This is a very good question. Generally speaking, Areas of interest are highlighted by structural engineer but number and location of bore holes is suggested by Geotechnical Engineering keeping structural in the loop. Number of bore holes depend upon consistency between different boreholes (once they drill boreholes and if the data is not consistent, then they might need to drill more), type of structure (some structures are very sensitive to settlement, like Large LNG Tanks) so a lot of bore holes would be done for a tank foundation than for other equipment foundation etc. Experience and engineering judgement also play a part. To sum up, Site variability in geotech info and Structural Sensitivity to geotech info are the major factors.

Thanks.

[Waqar Saleem]

Nice reply by Umar, very precise!!!

 

[Muhammad Hashmi]

Indeed.

[abbaskhan2294]

On 5/30/2021 at 6:11 PM, Muhammad Hashmi said:

Assalam O Alykum all

Is the any code that specifies that the location, numbers, center to center distance and depth of bore hole? shall be minimum up to that range ?

Does it also depend on the number of stories or area? Or it is purely based on engineering judgement and experience. How can we mark the location of bore holes other than seeing the heavy loaded areas? In the bore hole location plan.

 BS code 8002 specify that, the number of boreholes, or other form of investigation, should be adequate to establish the ground conditions along the length of the wall and to ascertain the variability in those conditions. The centers between boreholes will vary from site to site but should generally be at intervals of 10 m to 50 m along the length of wall.

Will be thankful if seniors can comment on this

The number of bole holes as stated by Umar bhai is dependent on your engineering judgement and site variability. However, literature have different opinions regarding this topic. E.g A literature suggests that for every 2500 sft one bore hole should be made. Another suggests to have minimum of 3 bore holes for site with soil relatively having similar properties whereas for variable soil a minimum of 5 bore holes should be made with 4 on corners of periphery and one at the centre. So it all depends on your experience and given site conditions.  

[Muhammad Hashmi]

Thanks abbas

[Vsratosfen]

Determining the specific location and depth of boreholes can depend on many factors, including the site's geology, topography, and intended use. It's often a matter of engineering judgment and experience.

If you need assistance with borehole drilling equipment or guidance on your project's best practices, check out UPET GROUP. They offer various industrial and manufacturing equipment, including drilling rigs and accessories for geotechnical drilling. Their team of experts can assist you in finding the right equipment and give you advice on the best practices for your project.

Edited April 17, 2023 by Vsratosfen