Oil And Natural Gas Corporation Geologist Interview Questions and Answers

Rock mass properties play a crucial role in tunneling using the New Austrian Tunneling Method (NATM).

• Rock mass properties include strength, deformation, and permeability.

• These properties affect the stability of the tunnel and the safety of workers.

• NATM relies on the rock mass to provide support, so understanding its properties is essential.

• Rock mass classification systems, such as the Q-system, can help geologists asse...read more

The rock type can vary depending on the site, but common types include sedimentary, igneous, and metamorphic rocks. The support system refers to the surrounding rock or material that provides stability to the rock formation. The methods of classification of rock type can include visual examination, laboratory testing, and geological mapping.

• Rock types: sedimentary, igneous, metamorphic

• Support system: surrounding rock o...read more

Groundwater is crucial for human and ecosystem survival. Water levels in wells rise and fall due to various factors. Artesian well water is from a confined aquifer. Groundwater is not always clean. Water can flow out of a hill due to natural springs. Porosity, permeability, water table, saturated zone, and unsaturated zone are important groundwater concepts.

• Groundwater is essential for human and ecosystem survival

• Water...read more

Rock bolting is a technique used in geotechnical engineering to reinforce rock mass by inserting steel bolts into the rock.

• Rock bolting is used to provide support to unstable rock formations.

• It involves drilling holes into the rock and inserting steel bolts into them.

• The bolts are then anchored into the rock using grout or resin.

• Rock bolting is commonly used in mining, tunneling, and slope stabilization projects.

• It hel...read more

Grouting is a process of injecting a fluid material into the ground to fill voids or fractures.

• Used in construction to strengthen soil or rock formations

• Can be used to seal leaks in underground structures

• Materials used include cement, bentonite, and chemical grouts

Shortcrete is a type of concrete that is sprayed onto surfaces using a high-pressure hose.

• Also known as shotcrete

• Used in construction for creating walls, pools, and tunnels

• Can be applied to vertical or overhead surfaces

• Requires less formwork than traditional concrete

• Can be reinforced with steel fibers or mesh

• Used in soil stabilization and slope protection

• Commonly used in mining and tunneling projects