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Safe bearing capacity of soil - Local shear failure

 
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sprateek
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PostPosted: Mon Sep 09, 2019 5:47 am    Post subject: Safe bearing capacity of soil - Local shear failure Reply with quote

dear all

we are constructing, designing projects for government at Rajasthan. Soil investigation for all projects is being done. Most of the soil consultants are working out SBC for General and local shear and then averaging as per para 5.2.1.1 of is 6403. For example in one case  as as per soil investigation report void ratio is generally about 0.65 with soil with cohesion of 33 KPa and phi as 24 degree .

In this connection i am having certain doubts and i will be grateful if same can be clarified.

1. can this approach be used even if n is more than 40 and the soil is c - phi soil , as the above para of code is for cohesionless soil. If no, than what criteria should be used.

2. Even if soil is cohesion less soil with n value more than 20, still local shear to be checked as void ratio is more than 0.55.

3. Also i am having doubt that void ratio evaluation is not being done correctly. As soil investigation is done more than six months back to reject the findings are there any alternate way to check the void ratio. As other parameters like sieve analysis, shear strength parameters, moisture content. dry density etc have been worked out.  

thanks you


regards


prateek sharma
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es_jayakumar
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PostPosted: Mon Sep 09, 2019 2:41 pm    Post subject: Reply with quote

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es_jayakumar
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PostPosted: Mon Sep 09, 2019 3:06 pm    Post subject: Reply with quote

Er.Sharma,

Prof.P.C.Varghese, in his book "Foundation Engineering" (P-115) elucidates that for N more than 30, the soil is considered dense and general shear failure will be predominant in this case. For N value less than 10, the soil is loose and it is local shear failure. For N values  in between, mixed type of failure can be considered. If you have reservations on the voids ratio reported, then judge the failure by N value.

E S Jayakumar
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