मृदु संतृप्त मृत्तिका में ऊर्ध्व खुदाई के दौरान मृदा 4 m की गहराई तक खोदी जाती है। यदि मृदा का इकाई भार 20000 N/mहै तो मृदा की संसंजकता क्या होगी?

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BHEL Engineer Trainee Civil Official Paper (Held on 26 May 2019)
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  1. 10 kN/m2
  2. 40 kN/m2
  3. 20 kN/m2
  4. 26.67 kN/m2

Answer (Detailed Solution Below)

Option 3 : 20 kN/m2
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Detailed Solution

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संकल्पना:

क्रांतिक गहराई/असमर्थित ऊर्ध्व कट (Hc): यह वह गहराई है, जहाँ तक संसंजन मृदा की ऊर्ध्व खुदाई बिना किसी पार्श्व समर्थन के हो सकती है।

\({{\rm{H}}_{\rm{c}}} = \dfrac{{4 \times c}}{{γ \times \sqrt {{K_a}} }}\)

\({{\rm{k}}_{\rm{a}}} = \dfrac{{1 - {\rm{sin}}ϕ }}{{1 + {\rm{sin}}ϕ }}\)

जहाँ

ka = सक्रिय मृदा दाब का रैंकिन गुणांक 

ϕ = आंतरिक घर्षण कोण

γ = मृदा का घनत्व

c = संसंजन

गणना:

मृदु मृत्तिका के लिए ϕ = 0, γ = 20 kN/m3, H = 4 m

\({{\rm{k}}_{\rm{a}}} = \dfrac{{1 - {\rm{sin}}ϕ }}{{1 + {\rm{sin}}ϕ }}\)

\({{\rm{k}}_{\rm{a}}} = \dfrac{{1 - {\rm{sin}}0 }}{{1 + {\rm{sin}}0 }}=1\)

\({{\rm{H}}_{\rm{c}}} = \dfrac{{4 \times c}}{{γ \times \sqrt {{K_a}} }}\)
\(4 = \dfrac{{4 \times c}}{{20 \times 1 }}\)

c = 20 kN/m2

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