• Mohit Verma
• Prashant Garg

Every structure’s load is transferred to soil by base of structure called foundation. In general, foundation carries various types of loads like self weight of the structures, live load, wind load, earthquake load, Machine loads, etc. These loads are basically of two types in nature, one is Static load another is dynamic load. Static loads do not change their magnitude and on other side dynamic loads are fluctuating their magnitude varies with time so the behaviour of footing under static load and dynamic load is entirely different. In a foundation system soil and foundation act as a single body. When a harmonic periodic load is applied on a foundation by a machine mounted on it. The machine foundation and soil in the vicinity to the foundation act as a single medium. The vibration of machine loading is distributed in the soil by the foundation. This principle is called soil interaction. The effect of dynamic load is not limited only to the soil in vicinity of the machine foundation. However if some structure or independent foundation is present near the machine foundation it also experience dynamic effect of the machine foundation near to it. Sometimes it has seen major changes in the structure in vicinity to machine foundation has been noticed which are main reasons for damages like tilting of nearby structure, cracks in plinth protection, foundation settlement, etc. In the current study effect of dynamic loading on a footing and effect on nearby secondary footing is studied for this purpose first of all the analytical studies are carried out in the PLAXIS 2D platform for the purpose of accurate and practicality of results validation of thesis work with the previous done experimental work reference from research done by Abhijeet Swain & Priyanka Ghosh at IIT Kanpur and published in Canadian Geotechnical Journal are taken and various are taken from their published journal. For analytical study experimental data is modelled on PLAXIS 2D platform which is analyzed on appropriate scale and same geometrical properties and same loading conditions, so that the study can be compared with the experimental results. After validation various parameters like machine foundation and nearby structure under varying static loads, provision of sand drain/blankets between closely spaced footing under dynamic load, effect of varying amplitude force with different spacing between primary and secondary footings etc. are studied. It has been observed that with increase in spacing between the footings, dynamic effect of loading decreases and with increase of static loading on the secondary footing also peak displacements and acceleration gets reduced. With inserting sand blanket between two footing is also beneficial in reducing dynamic displacements as coarse sand is having very good damping properties, also the effect of the variation in thickness of the blanket is more dominating then variation in length of the blanket. Also relation is developed between dynamic displacements under secondary footing for peak frequency at various L/T ratios (Length/Thickness) of sand blanket.

Soil-Footing interaction, dynamic loading, dynamic displacement, sand blanket, damping

"Analytical Study on Behaviour of Soil-Footing Interaction under Machine Loading", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 5, page no.121-133, MAY-2018, Available :http://www.jetir.org/papers/JETIR1805626.pdf

"Analytical Study on Behaviour of Soil-Footing Interaction under Machine Loading", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 5, page no. pp121-133, MAY-2018, Available at : http://www.jetir.org/papers/JETIR1805626.pdf