NCD/G/NDMMPL/010/2023	7th June 2023

Mr. Shobhit Srivastava

New Delhi Metro Mall Pvt. Ltd.,

Ground Floor, MGF City, Khyberpass,

Mall Road, Near Khyber pass Petrol Pump,

New Delhi - 110054

Sub :	Additional requirements related to pile foundations

Ref :	Conducting Dynamic Cone Penetration Test for the Proposed Fencing, Barricading at Plot - B of the Proposed Shopping Mall of NDMMPL at MGF City, Khyber Pass Mall Road, Near Khyber Pass Petrol Pump, New Delhi - 110054

Dear Sir,

This is in reference to the above mentioned subject and your email dated 31st May 2023 regarding additional requirements for pile foundations, please find below the same.

1.	Lateral and Uplift Capacity of Pile :

Uplift capacity of the piles have been calculated and given here below whereas the lateral load capacity of the piles will be nil as the pile are free standing cantilever piles above ground of embedment.

Pile Dia (mm)	Pile Vertical

Load Capacity

(tons)	Safe Uplift Capacity of Pile

(tons)	Safe Lateral Load Capacity of Pile

(tons)
200	20	6	-
300	50	20	-

2.	Minimum Length/Depth of Pile :

To ensure the mobilisation of the full safe structural capacity of the Bored Cast In-
Situ piles, the piles should be adequately embedded or socketed into the virgin rock strata. Accordingly, the Bored Cast In-Situ piles should be embedded in the virgin rock strata to a minimum depth of 5 times the diameter of the pile in weathered rock strata for 200mm diameter of pile (i.e. minimum 1m in virgin rock strata) and 3 times the diameter of pile for 300mm diameter piles (i.e. minimum 0.9m in virgin rock strata).

However, considering the above and also that the rock strata has been encountered at a depth varying between 4m and 7m depths below the existing ground level, the minimum length of the pile will be about 5m.

3.	Soil Spring Constants :

As the substrata consists of filled-up soils with non-uniform compaction down to the depths of refusal/ rock strata, soil design parameters in such kind of strata has no relevance for pile designing proposes. Hence soil spring constant cannot be provided.

4.	Filled soils cannot be considered to resist lateral load of the pile foundations as discussed in earlier sections also.

We hope you find this in order.

Thanking you,

Yours sincerely,

Y.S. Rana

Executive Consultant