Groundwater_Control_HNC_U17

What is groundwater?

• Water held in soil in a non-saturated form

• Water found in rivers and lakes

• Water that evaporates into the atmosphere

• Water used for irrigation

What does the water table represent?

• The surface of a lake

• The change of water content in soil

• The depth of a river

• The amount of rainfall in an area

What is a method to keep groundwater out permanently?

• Sump pumping

• Sheet piling

• Well point systems

• Electro-osmosis method

What is one of the provisions for water-tightness during construction?

• Electro-osmosis method

• Shallow or deep-bored wells

• Diaphragm walls

• Horizontal ground water control

What is the usual mixture ratio of cement and sand in cement grout?

• 1:2

• 1:3

• 1:4

• 1:5

Which chemical can be used to form a gel in grouting to increase soil strength?

• Sodium silicate

• Calcium carbonate

• Magnesium sulfate

• Potassium chloride

What is the function of the pump facilities in the grouting process?

• To mix the grout

• To control the injection of cement grout

• To dry the grout

• To color the grout

What must be considered before designing the method of works for basement construction?

• Color of the walls

• Sub-soil condition

• Type of paint

• Number of windows

What is the purpose of lattice beams in basement construction?

• To span between diaphragm walls

• To provide lighting

• To enhance aesthetics

• To increase temperature

What is a key factor in the method of constructing an ordinary basement?

• Proper support of cut-off walls

• Use of concrete as retailing wall

• Ordinary basement floor installation with no holes

• Using the anchor same time as dewatering