Preliminary Investigation on the Behavior of Pore Air Pressure during Rainfall Infiltration

Mohd Ashraf Mohamad Ismail, Soon Min Ng, Nur Hasliza Hamzah, Mohd Hazreek Zainal Abidin, Aziman Madun, Saiful Azhar Ahmad Tajudin

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This paper focused on the preliminary investigation of pore air pressure behaviour during rainfall infiltration in order to substantiate the mechanism of rainfall induced slope failure. The actual behaviour or pore air pressure during infiltration is yet to be clearly understood as it is regularly assumed as atmospheric. Numerical modelling of one dimensional (1D) soil column was utilized in this study to provide a preliminary insight of this highlighted uncertainty. Parametric study was performed by using rainfall intensities of 1.85 x 10-3m/s and 1.16 x 10-4m/s applied on glass beads to simulate intense and modest rainfall conditions. Analysis results show that the high rainfall intensity causes more development of pore air pressure compared to low rainfall intensity. This is because at high rainfall intensity, the rainwater cannot replace the pore air smoothly thus confining the pore air. Therefore, the effect of pore air pressure has to be taken into consideration particularly during heavy rainfall.

Original languageEnglish
Article number012051
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 11 Apr 2018
EventInternational Seminar on Mathematics and Physics in Sciences and Technology 2017 - Batu Pahat, Malaysia
Duration: 28 Oct 201729 Oct 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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