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Abdul_Zahir
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Joined: 01 Sep 2022
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 Posted: Thu Sep 01, 2022 2:11 pmPost subject: Requirement of base course material below the foundation above the rock surface. |
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As per the site condition while excavating the ground for the foundation we are getting the hard rock strata at 1m below from the FGL. In this case, is it allowed to directly place the PCC after the compaction of the surface or not??. But as per the geotechnical report it has been mentioned ,back fill with 250mm thickness of engineering fill material and compaction with 95% dry density.
Please suggest,whether Engineering fill to be used or we can directly pour PCC on the hard Rock.
Also attached video and photos for reference.
Thank You.
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vikram.jeet
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Joined: 26 Jan 2003
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| Posted: Thu Sep 01, 2022 4:08 pmPost subject: |
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Base course material in form of PCC is definitely a superior material compared to engg fill but cost could be a reason behind for suggesting er fill. CBR value of pcc is high wrt compacted fill. Dry lean concrete (DLC ) as per Morth specs can be used as base course .
Experts engaged in Road works can give better viewpoint for this situations. |
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suraj
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Joined: 17 Apr 2008
Posts: 5537
地点:NCR法里达巴德,E邮件suraj_engineer@yahoo.co.uk
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| Posted: Sun Sep 04, 2022 8:19 amPost subject: Rock, Blinding & Engineered Fill |
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Rock, Blinding & Engineered Fill
Does soil investigaion report say existence of hardrock?
If rock is hard @ 1 m below ground level & ther exists no issue, pertinent aceptance of bearing capacity, blinding can be done but, because it is hard rock, dressing to lines & levels cav be little difficult
Engneered fill is good for cases, when working bearing capacity is not available. Yet, enginered fill is also, not an easy proposition to carry out.
Engineered fill is a good proposition, where soil bearing capacity is required to be improved.
Excat response can be given only, after knowing soil investigation factual parameters
Make sure that rock is free from fissures / faults / faults or crack |
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spsvasan
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Joined: 18 Dec 2008
Posts: 374
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| Posted: Sun Sep 04, 2022 11:05 amPost subject: Re: Requirement of base course material below the foundation above the rock surface. |
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| Abdul_Zahir wrote: |
As per the site condition while excavating the ground for the foundation we are getting the hard rock strata at 1m below from the FGL. In this case, is it allowed to directly place the PCC after the compaction of the surface or not??. But as per the geotechnical report it has been mentioned ,back fill with 250mm thickness of engineering fill material and compaction with 95% dry density.
Please suggest,whether Engineering fill to be used or we can directly pour PCC on the hard Rock.
Also attached video and photos for reference.
Thank You.
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Dear Er.Zahir
This is really a question for geotechnical engineers. However I will try to reply.
In my opinion hard rock stratum has not yet been reached. The JCB seems to be scraping the surface rather easily. If rock pieces can be found in the scraped material this might by soft disintegrated rock. In the case of hard rock, if a crowbar is dropped vertically on the rock surface, it should rebound with a ringing sound.
The layer between the foundation layer and footing should be of strength greater than the earth layer and lower than the footing concrete. Hence I feel that plain concrete is the better choice here
SPS |
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