INFLUENCE OF DEGREE OF COMPACTION AND SURCHARGE ON CBR VALUE OF GEOGRID REINFORCED CLAY AND SANDY SOILS

Abstract

As the many constructions activity are to be done in different fields under many government schemes. There is huge need arise to economize the construction cost and cost of material. The subgrade is that part of soil which supports the many types of footing and also carries the load from superstructure. As at every place good quality of subgrade is not available, so there is need to improve the quality of weak subgrade. Either we replace it completely and fill it with good quality of material or improve the engineering property of subgrade by using ad mixer or by using the polymer just like geogrid, geotextiles etc. As the replacement of subgrade is not economical solution when the weak subgrade is presented up to a should have good bearing capacity and other engineering properties which may further economize the cost of construction.As the material chosen for the improvement of subgrade must have appropriate strength itself or in combination with the soil and it must be economical to use and easily available. In the present investigation CBR tests were carried out on sandy and clay soils. With these two types of soils we are also using the geogrid as reinforcement at different positions.Here we are also increasing the surcharge and degree of compaction. Effect on the CBR value is to be observed at increase in surcharge and degree of compaction on reinforced clay and sandy soils. It was reported that with increase in surcharge and degree of compaction CBR value of soil also increased. The optimum result comes out when we use increased surcharge, degree of compaction and geogrid in a single stage.