Which of the following statements in the context of capillary pressure in soils is NOT true?

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HPCL Engineer (Civil) 04 Nov 2022 Official Paper
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  1. Capillary pressure is more in coarse grained soils
  2. Effective stress increases due to capillary zone
  3. Water is under tension in capillary zone
  4. Pore water pressure is negative in capillary zone

Answer (Detailed Solution Below)

Option 1 : Capillary pressure is more in coarse grained soils
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Detailed Solution

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Capillary pressure head is given by:

\(H = \frac{K}{{e{D_{10}}}}\)

Where

K = constant

E = void ratio

D10 is size of soil grains having percentage of finer 10 %.

D10 for Coarse grain soil is more than fine grain soil for a given void ratio, so Capillary pressure head is less for coarse grain soil. Hence, capillary pressure is less in coarse grained soil. (So, option 1 will be false)

Due to capillary action also called surface tension water gets trapped into the voids of soil mass and comes under the tension which makes pore water pressure negative.
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