A comparative study on the use of woven geotextile for settlement reduction of spread footing on granular soil

• Main Authors: Gudes, Maricris O., Tan, Lilibelle L., Yu, Angelo Chris C.
• Format: text
• Language: English
• Published: Animo Repository 2017
• Subjects: Geotextiles; Civil Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/7836
• Institution: De La Salle University

Utilization of geotextiles has been known to reduce the settlement in any kind of soil such as sand, and this study seeks to quantify aforementioned settlement reduction. It is done by comparing the effect of data obtained from an isolated footing concentrically loaded on varying depths of geotextiles and a trial with no geotextile. It is assumed that all woven geotextile used throughout the experiment present no factor in the output. The varying embedment of the geotextile is related to the depth of the boundary condition, which is equivalent to the width of the footing. The width is equal to 10 cm. All experimental setup are identical, aside from the presence of the geotextile, and are comprised of granular soil simulated by Ottawa and black sand with a 75% relative density. The significant geotechnical parameters for the preliminary data were based on literature and through experiment. In these setups, it is also presumed that the failure zone does not exceed the boundary condition. Among all the trials, it was concluded that the setup with the geotextile closest to the footing, having a depth that is equal to the quarter of the width of the footing displayed the greatest magnitude in terms of load bearing capacity consequently having the highest reduction in settlement. On the other hand, geotextile at a depth equal to the width of the footing exhibits results similar to that of the trial with no geotextile supported by the findings that as the depth of geotextile embedment increases further away from the footing, the load bearing capacity decreases. The variation of geotextile embedment also resulted to a variation in mode of failure and it was verified that the failure zone is truly incapable of coming in contact with the boundary condition. Overall, it was found that the geotextile was able to reduce soil settlement by 11% to 31% and the settlement with geotextile results to a factor of 0.69 to 0.89 of the settlement without geotextile. The range of values are dependent on the depth of the geotextile embedment.