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Previous Year Exam Questions for Ground Improvement Techniques - GIT of 2018 - BPUT by Ruparani Mahapatra

  • Ground Improvement Techniques - GIT
  • 2018
  • PYQ
  • Biju Patnaik University of Technology BPUT - BPUT
  • Civil Engineering
  • B.Tech
  • 46 Views
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Registration No : Total Number of Pages : 02 B.Tech. PCI7J002 7th Semester Regular Examination 2018-19 GROUND IMPROVEMENT TECHNIQUE BRANCH : CIVIL Time : 3 Hours Max Marks : 100 Q.CODE : E034 Answer Question No.1 (Part-1) which is compulsory, any EIGHT from Part-II and any TWO from Part-III. The figures in the right hand margin indicate marks. Part- I Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) c) d) e) f) g) h) i) Short Answer Type Questions (Answer All-10) Define and explain Collapse potential of a soil. Explain what you mean by depth of active zone. Show the differences between sand piles and sand drains. What are the advantages of soil nailing? State the most important property required for deciding the spacing of sand drains in a soft clay deposit. An SPT blow count N = 50 is typical for which type of soil? What is a land fill? What do you mean by dynamic compaction? How does it help you in dealing with earthquake forces? What is the cement content requirement for different types of soils? Name a few waste materials generally used for ground modification. Part- II Focused-Short Answer Type Questions- (Answer Any Eight out of Twelve) What is the necessity of compaction? Discuss the ways and means for cement stabilization of a soil. Distinguish between methods of impact used in densification of granular soil deposit at ground surface and at depth. What do you mean by accelerated pre-consolidation of clays? How is it achieved? Discuss the use of sand drains and sand wicks for the purpose. A 20 m diameter tank exerts a pressure of 150 kPa on a 6 m thick layer of sand. The ground water table is at the surface. The average cone resistance recorded was 22 MPa. Estimate the settlement. Using 300 mm diameter plate, additional settlement of 3 mm was recorded for a pressure increase of 80 kPa. Calculate the coefficient of subgrade reaction and corresponding Young’s modulus. What are various dewatering techniques which are generally used for ground improvement? Discuss in brief. What do you mean by grouting? How penetration grouting is different from permeation grouting? Discuss various applications of grouting. Calculate the transmissivity of a geo-net using the following laboratory test data: flow rate per unit width, q = 0.70 x 10-4 m2/sec and hydraulic gradient, i = 0.05. How stone columns help soil stabilize and gain bearing capacity? Discuss. (2 x 10) (6 x 8)

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j) k) l) Q3 List and discuss four physical characteristics of a grouting liquid relevant to engineering applications. Discuss the use of a impact roller in densifying the soil to carry the earthquake loads. What measures you will take before you start constructions in an expansive soil, a soft soil and a collapsible soil? Explain in brief. Part-III Long Answer Type Questions (Answer Any Two out of Four) What is the necessity of compaction? How does it differ from consolidation? Discuss the ways and means for lime stabilization of a soil. Discuss various compaction control tests in detail. When and why deep surface compaction control tests are resorted to? Explain. (16) Q4 A soil profile has an active zone of expansive soil of 3 m. The liquid limit and average natural moisture content during the construction season are 54% and 20% respectively. Determine the free surface swell. What measures you will take before you start constructions in an expansive soil, a soft soil and a collapsible soil? Explain in brief. (16) Q5 Enumerate various geo-synthetics commonly used for ground improvement techniques? What is a geo-net? What are various properties of a geo-textile which are generally taken into consideration before their use? What are the desirable properties? Differentiate between transmissivity and permittivity? What are various tests conducted on the geo-textiles before their use? Calculate the transmissivity of a geo net using the following laboratory based data; (i) Flow rate per unit width, q = 0.72X 10-4 m2/s, (ii) Hydraulic gradient, I = 0.05. (16) Q6 How do you estimate the bearing capacity of foundations on sanitary land fills? How earthquake drains and blasting help soil stabilize and gain bearing capacity? (16)

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