Gammon Engineers And Contractors Geologist Interview Questions and Answers

RMR value is calculated by assigning scores to various parameters related to rock mass characteristics.

• RMR stands for Rock Mass Rating.

• It is calculated by assigning scores to six parameters: uniaxial compressive strength, rock quality designation, spacing of discontinuities, condition of discontinuities, groundwater conditions, and orientation of discontinuities.

• The scores for each parameter are added up to get the RMR...read more

Various instruments are used in tunnel excavation, including drilling machines, blasting equipment, and tunnel boring machines.

• Drilling machines are used to create holes in the rock or soil for explosives.

• Blasting equipment is used to break up the rock or soil.

• Tunnel boring machines are used to excavate tunnels without the need for explosives.

• Surveying instruments are used to ensure the tunnel is being excavated in the...read more

RQD stands for Rock Quality Designation, a measure of rock mass quality used in geology and engineering.

• RQD is calculated by measuring the percentage of intact rock pieces longer than 10 cm in a drill core sample.

• It is used to assess the strength and stability of rock masses for engineering projects such as tunnels, dams, and foundations.

• Higher RQD values indicate better rock quality and greater potential for stability...read more