सिभिल इन्जिनियरिङ
सिभिल इन्जिनियरिङ
Civil Engineering · ५,१७१ प्रश्न
५,१७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सिभिल इन्जिनियरिङ: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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A 6 m thick clay layer is drained at top and bottom and has cv = 5 m²/year. Taking Tv = 0.848, the time for 90% consolidation is about:
सही उत्तर: ख) 1.53 years
Double drainage gives d = 3 m; t = Tv·d²/cv = 0.848 × 9/5 ≈ 1.53 years.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Terzaghi's consolidation theory, the time factor for 90% average degree of consolidation is about:
सही उत्तर: ग) 0.848
Tv ≈ 0.197 for 50% and ≈ 0.848 for 90% consolidation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Vibroflotation as a ground improvement technique is most effective for:
सही उत्तर: ग) Loose cohesionless (sandy) deposits
Vibration rearranges sand grains into a denser packing; it is far less effective in cohesive soils.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the IS heavy compaction (modified Proctor) test, the soil is compacted in the mould in:
सही उत्तर: घ) 5 layers
The heavy compaction test uses 5 layers (light compaction uses 3), each given 25 blows in the 1000 cm³ mould.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A field compacted fill has a dry density of 17.1 kN/m³ and the laboratory maximum dry density is 18.0 kN/m³. The relative compaction is:
सही उत्तर: ख) 95%
Relative compaction = field γd/max γd × 100 = 17.1/18.0 × 100 = 95%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The roller best suited for compacting cohesive (clayey) soils in embankments is the:
सही उत्तर: ग) Sheepsfoot roller
Sheepsfoot rollers knead and compact clay from the bottom of each layer upward; vibratory rollers suit granular soils.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cohesive soil compacted on the dry side of optimum moisture content generally develops:
सही उत्तर: ग) A flocculated structure with higher permeability
Dry of optimum gives a flocculated structure, higher strength and permeability but greater swell potential; wet of optimum gives a dispersed structure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a compaction curve, the zero air voids line represents the dry density at:
सही उत्तर: ख) 100% saturation for each water content
The zero air voids line gives the theoretical maximum dry density at each water content if all air were expelled (S = 100%).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For computing vertical stresses in stratified soils with thin, rigid, non-yielding horizontal reinforcing layers, the theory generally used is:
सही उत्तर: ग) Westergaard's theory
Westergaard's solution assumes lateral strain is prevented by thin rigid layers, suiting stratified soils; Boussinesq assumes a homogeneous isotropic mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A permanent lowering of the groundwater table in an area generally causes:
सही उत्तर: ग) An increase in effective stress and settlement of compressible layers
Lowering the water table reduces pore pressure, increasing effective stress, which consolidates clay layers (e.g. land subsidence).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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