Soil Improvement Techniques Chapter 1 Quiz
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Questions and Answers

What is the general practice for buildings if the soil close to the ground surface has sufficient bearing capacity?

  • Use pier foundations
  • Use deep foundations
  • Use shallow foundations (correct)
  • Use pile foundations

    • Which method may prove more economical than deep foundations in some cases?

  • Sand and stone columns (correct)
  • Vibroflotation
  • Mechanical compaction
  • Preloading

    • Which technique involves the use of admixtures for soil improvement?

  • Injection of suitable grouts
  • Use of geotextiles (correct)
  • Mechanical compaction
  • Vibroflotation

    • Which method involves the injection of suitable grouts for improving soil at a construction site?

    <p>Use of admixtures</p> Signup and view all the answers

    What method refers to the technique of removal and replacement for improving soil behavior?

    <p>Preloading</p> Signup and view all the answers

    What is the primary purpose of studying the optimum thickness of replacement layers and the most suitable material for soil improvement?

    <p>To minimize construction costs while improving soil bearing capacity and minimizing settlement</p> Signup and view all the answers

    In what situation would pile or pier foundations be the obvious choice?

    <p>When the topsoil is loose or soft</p> Signup and view all the answers

    In which category of soil improvement does precompression or preloading fall?

    <p>Soil improvement without admixtures</p> Signup and view all the answers

    What is the main advantage of soil replacement over other techniques and deep foundation?

    <p>It requires less delay to construction</p> Signup and view all the answers

    Why is the determination of the replacement soil thickness for soil replacement based on experience?

    <p>Because the region of high stress in a shallow foundation is only 1 to 1.5 its breadth</p> Signup and view all the answers

    Which type of soil is precompression or preloading technique most effective in?

    <p>Clayey soil</p> Signup and view all the answers

    What does soil replacement aim to achieve under shallow foundations?

    <p>Reduce consolidation settlement and increase soil bearing capacity</p> Signup and view all the answers

    In the context of soil improvement, what is the primary purpose of precompression or preloading technique?

    <p>To minimize consolidation settlement before construction of the structure</p> Signup and view all the answers

    What is the main reason for using precompression or preloading technique in clayey soils?

    <p>Due to low permeability of clayey soils</p> Signup and view all the answers

    Why does clayey soil require a very long time for desired consolidation to occur even with very high surcharge load?

    <p>Because clayey soils have low permeability.</p> Signup and view all the answers

    What does soil replacement aim to achieve under shallow foundations?

    <p>Reduce consolidation settlement and increase soil bearing capacity.</p> Signup and view all the answers

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