माटो र जग – Soil Mechanics & Foundation MCQ
माटो र जग – सिभिल इन्जिनियरिङ
Soil Mechanics & Foundation · Civil Engineering · ३९५ प्रश्न
३९५ 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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For local shear failure, Terzaghi reduced the cohesion and friction parameters by taking:
सही उत्तर: घ) c' = (2/3)c and tanφ' = (2/3)tanφ
Terzaghi's local shear correction uses two-thirds of c and tanφ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A footing has net ultimate bearing capacity 300 kPa at depth 1 m in soil of γ = 18 kN/m³. With factor of safety 3, the safe bearing capacity is:
सही उत्तर: क) 118 kPa
qs = qnu/F + γDf = 100 + 18 = 118 kPa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using Terzaghi's theory (Nc = 5.7, φ = 0), the net ultimate bearing capacity of a strip footing on clay with c = 40 kPa is:
सही उत्तर: क) 228 kPa
qnu = cNc = 40 x 5.7 = 228 kPa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Terzaghi, a foundation is classified as shallow when its depth is:
सही उत्तर: ख) Less than or equal to its width
Terzaghi defines a shallow foundation as Df ≤ B.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Expansive black cotton soil shows large swelling mainly because it contains the clay mineral:
सही उत्तर: ग) Montmorillonite
Montmorillonite has weak interlayer bonds that absorb water and swell greatly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the drainage path length of a clay layer is doubled, the time for the same degree of consolidation becomes:
सही उत्तर: घ) 4 times
t = TvH²/cv, so time varies with the square of drainage path.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A normally consolidated clay layer 4 m thick has Cc = 0.3, e0 = 1.0, initial effective stress 100 kPa and stress increase 100 kPa. Its primary consolidation settlement is about:
सही उत्तर: घ) 181 mm
S = CcH/(1+e0) log((σ0+Δσ)/σ0) = 0.6 x log2 ≈ 0.181 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using the empirical relation Cc = 0.009(LL - 10) for normally consolidated clay, the compression index of a clay with liquid limit 50% is:
सही उत्तर: क) 0.36
Cc = 0.009(LL - 10) = 0.009 x 40 = 0.36 (Terzaghi-Peck / Skempton relation).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A clay has preconsolidation pressure 200 kPa and present effective overburden 100 kPa. Its overconsolidation ratio is:
सही उत्तर: ख) 2
OCR = σ'p/σ'0 = 200/100 = 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Secondary consolidation of clay is mainly due to:
सही उत्तर: ग) Plastic readjustment (creep) of soil particles after pore pressure dissipation
Secondary compression occurs after primary consolidation, due to creep of the soil skeleton.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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