Laboratory investigations for development of design criteria for varying shapes of protective filters

Abstract

Laboratory investigations have been carried out in the past regarding the design of protective filters based on the controlling constriction size of the filter mass. In all such studies, the particle shape has been considered spherical. However the fact remains, that the controlling constriction size changes with shape of filter particles. The present study is an attempt to assess the effect of shape on controlling constriction size usually based on the concept of spherical shape, and subsequently observe its effect on the design criteria adopted for filters. Based on laboratory investigations for three different shapes of filter material i.e. elliptical, sub-rounded and irregular, the improvements to the existing filter design criterion are proposed in this study by way of correction factors for each shape of filter material.

Keywords:

• Filter
• shape of particles
• constriction size
• cohesion-less bases
• piping
• migration of fines

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

Nasir Ahmad Rather is currently pursuing doctorate from National Institute of Technology, Srinagar (190006), Jammu & Kashmir. The author works as an assistant professor at Baba Ghulam Shah Badshah University (BGSBU), Rajouri (185234), Jammu and Kashmir, India. His area of research includes Geotechnical Engineering, Protective Filters, Hydraulic and Environmental Engineering.

Mohd Akbar Lone is a professor of Civil Engineering at the Department of Civil Engineering, National Institute of Technology, Srinagar, India. His area of expertise includes Water Resources Engineering & Hydraulic Structures, Geotechnical Engineering, Filters, Surface Hydrology and Flood Management Studies.

Abdul Qayoom Dar is a professor of Civil Engineering at National Institute of Technology, Srinagar, India. His area of expertise includes Geotechnical & Water Resources Engineering, River modelling and climate change.

Bintul Huda Mir is a research scholar at the Department of Civil Engineering, National Institute of Technology, Srinagar. Her research area includes Water Resources Engineering and Hydraulic Structures.

Acknowledgement

This paper presents part of the research work carried out by the author ^* who received Doctoral Fellowship from the Ministry of Human Resources Development (MHRD), Government of India. The experimental work was carried out in the Fluid Mechanics Laboratory, NIT Srinagar, Jammu and Kashmir, India.