माटो र जग – Soil Mechanics & Foundation MCQ
माटो र जग – सिभिल इन्जिनियरिङ
Soil Mechanics & Foundation · Civil Engineering · ४०३ प्रश्न
४०३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
माटो र जग: 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 major drawback of the direct shear test is that:
सही उत्तर: ख) The failure plane is forced to be horizontal and drainage cannot be controlled
In the shear box the failure plane is predetermined and pore pressures cannot be measured or drainage controlled, unlike in triaxial tests.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A dry sand (c = 0, φ = 30°) is tested in a triaxial test with cell pressure 100 kPa. The major principal stress at failure is:
सही उत्तर: ग) 300 kPa
σ1 = σ3·tan²(45° + φ/2) = 100 × tan²60° = 100 × 3 = 300 kPa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Installing vertical sand drains or prefabricated vertical drains (PVD) in a soft clay deposit mainly:
सही उत्तर: घ) Shortens the drainage path and speeds up consolidation
Drains reduce the drainage path length (mostly radial flow), so consolidation time, which varies with d², is greatly reduced.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Taylor's square-root-of-time fitting method is used in consolidation testing to determine the:
सही उत्तर: ख) Coefficient of consolidation (cv)
Taylor's √t method (like Casagrande's log-t method) fits the time–settlement curve to find t90 and hence cv.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The preconsolidation pressure of a clay from oedometer test data (e vs log σ') is commonly estimated by:
सही उत्तर: ख) Casagrande's graphical construction
Casagrande's construction (point of maximum curvature, tangent, bisector) locates σ'p on the e–log σ' curve; Taylor's method gives cv.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A clay has coefficient of consolidation cv = 1 × 10⁻⁷ m²/s and coefficient of volume compressibility mv = 2 × 10⁻⁴ m²/kN. Taking γw = 10 kN/m³, its coefficient of permeability is:
सही उत्तर: क) 2 × 10⁻¹⁰ m/s
k = cv·mv·γw = 10⁻⁷ × 2 × 10⁻⁴ × 10 = 2 × 10⁻¹⁰ m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (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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