Hydrogeology and Engineering Geology [IAS (Admin.) Mains Geology]: Questions 1 - 5 of 33

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Question 1

Appeared in Year: 2017 (IFS)

Describe in Detail Subjective▾

Explain Causes, effects and mitigation measures of concrete cancer

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Explanation

Concrete Cancer

Introduction

  • Concrete cancer is caused when the steel reinforcing within a concrete slab begins to rust.
  • As the steel rusts, it expands, displacing the concrete around it, causing it to become brittle and crack thus accelerating the process.

Causes and Effect of Concrete Cancer

  • A poor poured substrate – which allows moisture to pass thro…

… (294 more words, 9 figures) …

Question 2

Appeared in Year: 2017 (IFS)

Describe in Detail Subjective▾

Discuss the geological history of Trilobites with specific description of the abundance, decline and extinction of the group through the Palaeozoic Era. (Geology optional – paper 1)

b) Give a detailed account of the field and laboratory tests carried out to determine the engineering properties of rocks.

To explain the field and laboratory tests carried out to determine the engineering properties of rocks.

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Explanation

Field Test to Determine Engineering Properties of Rocks

  • Mechanical behaviour of rock cannot be determined from laboratory tests. Hence, field tests are carried on to estimate the properties of rock mass.
  • The type and number of in-situ tests depends upon the structure and the rock condition. The in-situ tests are
    • Shear test
    • Deformability test
    • Strength te…

… (175 more equations, 22 figures) …

Question 3

Appeared in Year: 2017 (IFS)

Describe in Detail Subjective▾

Write Note on: Ghyben – Herzberg relationship

The saltwater and underground freshwater are analysed through hydrostatic equilibrium using Ghyben – Herzberg relationship

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Explanation

Ghyben – Herzberg Relationship

Introduction

Salt-water intrusion or encroachment is the movement of Saltwater into underground sources (aquifers) of freshwater which can occur in coast regions or inland and the surface movement of saltwater inland from the coast.

Aquifers

  • Permeable rock formations that store underground and transmit sufficient quantity…

… (150 more equations, 24 figures) …

Question 4

Appeared in Year: 2017 (IFS)

Describe in Detail Subjective▾

Elaborate the procedure for ‘Aquifer performance test’ and estimation of hydraulic properties of aquifers. (Mains Paper-1)

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Explanation

Aquifer Performance Test

Introduction

  • Permeable rock formations, which store under groundwater and transmit sufficient quantity of it to a pumping well, are called aquifers.
  • The performance characteristics of well and hydraulic head of an aquifer can be determined by the pumping test. Pumping test is used to determine the aquifer hydraulic characteris…

… (492 more words, 7 figures) …

Question 5

Appeared in Year: 2017 (IFS)

Describe in Detail Subjective▾

Describe the geological considerations for designing and constructing earthquake resistant structures. (Paper-1)

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Explanation

Geological Considerations for Designing and Constructing Earthquake Resistant Structures

Techniques

  • Shear walls they resist gravity leads and lateral loads
  • Bracing
  • Dampers
  • Rollers

Active System

The system provides seismic protection by imposing forces on a structure that counter balance the earthquake induced forces.

Passive System

These systems …

… (388 more words, 18 figures) …