Project Objective:
Investigating project land to ensure it is clearness from any archeological sites.
Radargram Interpretation:
Area of interest is clearly spotted which shows positively the existence of underground structure.
Project Objective:
Investigating area beside an archeological site to resolve a dispute between the governorate and the archeological authorities.
Radargram Interpretation:
A test profile was conducted at the archeological site (Figure 1) as a reference for our works on the disputed over area, and it shows the anomaly of the discovered tomb.
At the disputed over land, anomalies are clearly spotted which shows positively the existence archeological structure.
Problem:
Several soil subsidence in the area.
Project Objective:
Soil Assessment to highlight areas of weakness and risk that needs an immediate solution and reparation.
Radargram Interpretation:
1. Pavement layer, 2. Base layer of the road, 3. Bed rock, 4. Weak Zones, 5. Water Saturation Zones
Problem:
Water leakage in the power station cooling tower
Project Objective:
Soil Assessment to highlight areas of weakness and risk that needs an immediate solution and reparation.
Interpretation:
A GPR survey was conducted to the cooling tower with the water leakage problem where we used two types of filters first to spot the water saturation zones and the second one to spot the weak, fractures & possible voids that could be created due to the high-pressure water leakage.
A second survey was conducted to the same building after engineering treatment to the spotted weak zones using injection method to check the reliability of the solution.
Conclusion:
Using the processed radargrams for soil investigation, no significant anomalies revealed during the second survey beneath ground surface till 5 m depth.
Based on the results of the second GPR survey at cooling tower URA-20 and compared to the results of the first conducted GPR survey, the following can be concluded:
1- The possible voids highlighted in the first survey had been treated, as nearly all the prominent anomalies for the possible voids either vanished or severely retreated during the conducted second survey.
2- The water saturation filter shows significant declination at the water saturation levels compared to the first survey results, in addition to the disappearance of the revealed weak zones spotted during the first survey.
3- In general, the treatment process that took place in the last 3 months has a significant positive impact on the soil conditions beneath cooling tower with respect to the conducted GPR survey before and after the treatment.
Problem:
Unknown underground cavity “trench”
Project Objective:
GPR survey for specific areas to highlight any normal or manmade cavity.
Radargram Interpretation:
Highlighted areas on the radargram shows the underground utilities and a “trench” cavity that would represent hazard on the project constructions.
Problem:
A cavity was found by chance while constructing a new road.
Project Objective:
Mapping a normal cavity that exists in a new road path.
Radargram Interpretation:
The GPR survey was planned to cover the 33 meters road path width with 10 parallel profiles with 3 meters spacing.
Highlighted areas on the radargram shows the cavity beneath the new road path. Cavity is revealed in the first 4 radargram with maximum length 20 meters at profile A-1 and decreased to reach 4 meters at profile A-4, before it vanishes at profile A-5.
Problem:
Rising underground water level at tunnel construction area
Project Objective:
Hydrological assessment for the tunnel construction area.
