Project 2
Review of Detailed Geotechnical Interpretative Report:
1.0 Introduction
This report refer as R3/SH15-023, covering Two (02) boreholes, in which One (01) borehole drilled
down to a depth of 30.0m & the other borehole drilled down to a depth of 20.0 m, below existing
ground level (EGL). The borehole locations are provided by the contractor M/s. Six Construct for
the proposed Waste Water Treatment Plant Capacity Upgrade Works-Ajman, U.A.E. Each
borehole/CPT locations were excavated approximately around 3.0m prior to start boreholes for
checking presence of underground utilities.
1.1 Scope of Work
BH-2
Trial Pits-2
Standpipe Piezometer-2
CPTs-12
2.0 Site Location and Project Description
2.1 Site Location
The site is located in the Emirates of Ajman; United Arab Emirates about 4 kms from the Sheikh
Mohammad Bin Zayed Road (E311) and just 8 kms from the Arabian Gulf. A site layout is included
in appendix-A for reference.
3.0 Field Works
The assigned geotechnical investigation works mainly involve the following site activities / testing:
• Drilling of boreholes of 30.0 m depth - 01 Nos.
• Drilling of boreholes of 20.0 m depth - 01 Nos.
• Cone Penetration Test (CPT) - 12 Nos.
• Trail Pits (up to 3.0m depth) - 02 Nos.
• Standpipe piezometer installation - 02 Nos.
- Stake Out of the Investigative Locations
- Drilling of Boreholes
- Field Testing and Sampling
- Description of Soil Sample
- Description of Rock Materials
- Trial Pit Excavation
- Standpipe Installation
- Cone Penetration Test
- Field Testing (Cone Penetration Test)
4.0 Laboratory Testing
Summary of Laboratory test results:
| Name of the test | Soil | Rock |
| Moisture content | 17.1 | - |
| Specific gravity | 2.67 | - |
| Liquid limit | 60 | - |
| Plastic limit | 45 | - |
| Shrinkage limit | 33 | - |
| Sieve analysis | Well graded | - |
| Density | 1.8 g/cc | 2.25 g/cc |
| UCS value | 1.8 MPa | 400 MPa |
| IS 50 |
0.8 MPa |
- |
| Shear Strength Parameters | C=100 MPa, Phi-30 deg | Phi-38deg |
| pH | 8.2 | - |
| Sulphates | 86 mg/l | - |
| Cholrides | 284 mg/l | - |
5.0 Summary
All the above details have been summarized in this section.
6.0 References
IS2720 - Part 1-37-1985-Methods of test for soils
IS1892 -Subsurface investigation of soils
Cross section:
Ground Model:
SBC and Subgrade reaction:
SBC, qu = 0.5x gammax B X Ngamma ]= 0.5x21x23x115.31=27847.365 kPa
Modulus of subgrade reaction= Load/settlement =200 x 3.14x11.5x11.5/0.040 =2076325 kN/m