Study on the Performance of Square Footing Resting on Reinforced Sand Beds under Repeated Loading

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue X, October 2018 | ISSN 2321–2705

Study on the Performance of Square Footing Resting on Reinforced Sand Beds under Repeated Loading

H.C.Muddaraju1, Avinash.N 2, Mashyala Sharanamm3

1Assistant Professor, Civil Engineering Department, UVCE, Bangalore, Karnataka, India
2 Research Scholar, Civil Engineering Department, UVCE, Bangalore, Karnataka, India
3Post graduate student, Civil Engineering Department, UVCE, Bangalore, Karnataka, India

Abstract: – Various soil improvement techniques have been used to enhance the engineering properties of soil. One of the improvement techniques is soil reinforcement. This concept was widely used in the geotechnical field. In the present investigation plain-geogrid and geogrid-PVC pipe was used as reinforcement material to improve the load settlement characteristics of the square footing. And comparison was made between the 2D geogrid and 3D geogrid to investigate the effectiveness of inclusion of plain geogrid (2D geogrid) and geogrid-pipe (3D geogrid) on the improvement in the load settlement characteristics of sand bed under repeated loading.

Keywords: Reinforced sand bed, geogrid, PVC pipe, repeated loads, Cyclic Resistance Ratio, Settlement Ratio.

I. INTRODUCTION

The concept of soil reinforcement was used since ancient times; one of the oldest method of soil reinforcement is the inclusion of natural reinforcement material such as wood, bamboo and tree trunks. In 1960’s Henry Vidal a French architect and engineer introduced the modern concept of soil reinforcement. In recent year major part of land that are available for construction of structure is found to have poor bearing capacity which needs to be improved. One of the method that has recently gained more recognitions is soil reinforcement due to its cost effectiveness, ease of construction and it is less time consuming. The term Reinforced soil refers to soil that has been strengthened by placement of reinforcing material within the soil mass in the form of strips, bars, sheets or grids. When the load is applied to the soil mass this reinforcement materials resist the tensile stresses which is developed within the soil mass through friction, adhesion or bearing resistances.

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