Engineering and Technology Journal

Investigation of the Bearing Capacity and Collapsibility of Gypseous Soil Using Geotextile Reinforcement

Document Type : Research Paper

Authors

Civil Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.

Abstract

This study aims to increase the bearing capacity of the soil by using geosynthetics in a single, double, or triple distribution pattern. The gypseous soil samples were brought from a site near Sawa Lake in Al-Muthanna Governorate with a gypsum content of about (37%), the Soil-Model apparatus of dimensions (60 × 60 × 50) cm with the proposed square footing of dimensions (10 × 10) cm are used in the experimental program of this study. To achieve this goal, a series of (48) different model tests were used on gypseous soil subjected to vertical stress in both dry and wet (saturation) conditions. Depending on the results of load-settlement curves relationships, the ultimate bearing capacity of dry and wet gypseous soil models was determined using the Two Tangent Intersection technique. The results also showed that the number of geotextile layers and the relative density of the gypseous soil samples significantly impact the improvement of the bearing capacity of gypseous soil models. Furthermore, the results showed that the improvement ratio in bearing capacity (BCR%) for gypseous soil models tested after being reinforced with geotextile layer for dry and wet (saturation)  at relative density (RD) of 30% and  60%  in single, double and triple distribution pattern. The percentage of the improvement in the wet case was higher than in the dry case. It was 143 % in the wet case when using triple-layer geotextile at different depths of reinforcement, while it was 96 % in the dry case.

Graphical Abstract

Highlights

  • The bearing capacity ratio of gypseous soil was improved using different geotextile reinforcement patterns.
  • The maximum degree of improvement of gypseous model soil was achieved using a triple-layer at depth (0.5B+1B+1.5B)  of geotextile reinforcement with the wet case.
  • Increasing the number of geotextile reinforcement layers increases the ultimate bearing capacity values of for Gypseous Soil model.

Keywords

Main Subjects

References
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Engineering and Technology Journal
Volume 40, Issue 5
Civil Engineering
, 19 Articles
May 2022
Page 792-801
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