Abstract
An experimental study has been carried out to improve the bearing capacity of soils by using geotextile. In the present study geojute (gunny bags) is used as geotextile, whereas sand is used as soil media. This research presents the results of laboratory load tests on model square footings supported on reinforced sand beds. A total of 32 load tests are conducted to evaluate the effects of single layer reinforcement placed below square model footings. Parameters of testing programme of the research are the depth of reinforcement, the plan area of reinforcement and the footing size. The test results indicated that the maximum gain in ultimate bearing capacity (UBC) of footings on reinforced soil (by using geojute) is found to be increased by a factor of 3.37 as compared to soil without geojute. Also, the optimum size of reinforcement is found to be 3.5B × 3.5B irrespective of the type of reinforcing materials used. The optimum placement position of geotextile is found to be 0.5B from the base of the footing. At low settlement rates, the study on the values of BCR reveals almost the same results with regard to optimum depth and size of reinforcement mentioned above. It is found that with increase in the settlement rate, BCR increases. Also, the improvement in bearing capacity is found to increase with increase in footing size.
Highlights
The placement of the foundation of the structure on the loose soil strata causes the structural damage
When the reinforcement is placed in varying depth and size in sand bed, the settlement and ultimate bearing capacity has been changed due to effect of depth and size of reinforcement
To quantify or compare the performance, the BCR defined as the ratio of bearing capacity with reinforcement to the bearing capacity without reinforcement are computed at a given rate of settlement
Summary
The placement of the foundation of the structure on the loose soil strata causes the structural damage. These loose soil strata have no capacity to sustain the structural load of the structures. People choose the deep foundation to construct their structure in these loose soil strata. Sometimes the costs for the construction of structures are more due to the adoption of deep foundation. The use of geo synthetics is most common method for the improvement of ground. These geo synthetics are used as reinforcing agent to reinforce the soil strata, as a result the density and strength (bearing capacity) of the soil strata increased
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