FINAL REPORT PART II

375 MW ACME

PLANT AREA

NCD/G/RPPL/4536A(1)/2023	22 June 2023

Renew Power Pvt Ltd.,

Sub :	G(D) 4536A Conducting Geotechnical Investigation for the Proposed 375 MW ACME at Village Rampuriya, Tehsil Sahgada, District Jailsalmer, Rajasthan

INTRODUCTION

ReNew Power Pvt Ltd are in the process of constructing 375MW ACME solar power project at Village Rampuraiya, Tehsil Sahgada, District Jaisalmer, Rajasthan.

A detailed geotechnical investigation report for the Switch yard area had already been submitted as Part - I, for the above mentioned power project

The stipulated scope of work for plant area consisted of conducting boreholes down to a maximum depth of 5m below the existing ground level or minimum 3m below the existing ground level if refusal/rock strata is encountered before 3m depth, at twenty three locations, conducting two field california bearing ratio test and conducting two laboratory california bearing ratio test inclusive of modified proctor density test on one bulk soil sample collected from site

This report (Part II) is based on the geotechnical investigations results for a part of the investigations i.e. along with the results and analysis of the investigations and the recommendations thereof.

BOREHOLE INVESTIGATION :

All the twenty three boreholes had been progressed down to the stipulated depths as mentioned above. The refusal depth, termination depths and coordinates of the boreholes are as follows :

BHNo.	Refusal

depth (m) below EGL	Termination Depth (m) below EGL	Boreholes Coordinates (m)
X	Y
1A	1.5	3	758273.706	2935611.031
2A	1	3	758188.317	2935362.354
3A	2	3	758309.863	2935120.955
4A	1.0	3	758186.676	2934908.205
5	1.5	3	758020.151	2934786.337
6	1.0	3	758327.076	2934659.946
7	1.5	3	758148/.419	2934474.849
8	1	3	758584.931	2934274.685
9	1.5	3	758084.193	2934240.603
10	2	3	757356.897	2934376.383
11	1.5	3	757633.811	2934193.66
12	1	3	757881.331	2934043.837
13	1.5	3	758718.944	2933373.059
14	0.7	3	758934.356	2933062.284
15	1.5	3	759156.136	2932929.177
16	2	3	759485.454	2932844.715
17	1.5	3	759276.592	2932684.777
18	1	3	759595.455	2932600.562
19	1.5	3	759876.025	2932782.527
20	2	3	760212.033	2932880.35
21	4	4	760473.583	2933014.434
28	1.5	3	758957.098	2933424.437
29	1.5	3	759015.991	2933354.605

The results of the boreholes investigations indicate that the subsoil strata generally consists of silty sandy soils with significant percentages of gravel, pebble and conglomerate down to the depth of refusal strata below which substrata consists of highly weathered conglomarate/ sandstone down to the maximum depth investigated i.e. 4m below the existing ground level. The grain size distributions of the soil samples in the twenty three boreholes have been presented in the form of grain size analysis curves in figs.

Ground water table had not been encountered in any of the boreholes down to the maximum depth investigated i.e. 4m below the existing ground level.

The standard penetration test values (N-values) vary between 26 and 58. The observed N-values indicate that the subsoil is in a medium dense to dense state down to the depths of refusal strata.

The subsoil strata is predominantly non-plastic down to the depth of refusal strata.

The proposed structures are supporting structures for Solar Panels. Considering this, medium heavy loads can be anticipated on the foundations. Based on the above results and the probable loads on the foundations, the following recommendations are being made.

RECOMMENDATION :

Considering the above, the proposed structures can be supported over Short bored piles.

PILE CAPACTIES

The parameters considered for the analysis of the pile capacities are given below :

Sl.No.	Parameter	Vaslue
1	Effective length(m)	1.2 to 1.6
2	Cohesion (kg/cm2)	0.05
3	Angle of shearing resistance	32
4	Density (g/cm3)	1.8
5	SPT Value at pile tip	25
6	Factor of safety for pile vertical capacity