Improvement of Bearing Capacity of Sandy Soil by Grouting
Abstract
Improvement of Bearing Capacity of Sandy Soil by Grouting The constructional activities in the coastal areas often demand deep foundations because of the poor engineering properties and the related problems arising from weak soil at shallow depths. The very low bearing capacity of the foundation bed causes shear failure and excessive settlements. Further, the high water table and limited depth of the top sandy layer in these areas restrict the depth of foundation thereby further reducing the safe bearing capacity.
Grouting, which has several applications in the field of civil engineering, was once considered as a mysterious operation. The effectiveness of grouting requires a lot of understanding, skill, meticulous attention and an intuitive perception Grout is injected under pressure into the material to be grouted until it fills the desired volume of material around the hole or until the maximum specified pressure is attained and a specific minimum grout flow is reached. the strength improvement of loose sandy soils through cement grouting Permeation grouting is a simple method of ground improvisation technique which helps to stabilize the loose soil stratum.
Conclusion
Based on the experimental investigations and test results, the following conclusions are made. The shear strength of the loose sandy soil steadily increases with increase in cement content and also with curing period. The rate of increase in shear strength is very high at higher percentages of cement than at lower percentage. The stress strain response exhibit a linear relationship prior to the peak value for all cement contents and the peak stress decreases with increase in water content.
The value of cohesion intercept c and angle of shearing resistance Ø steadily increase with increase in cement content and also with curing period. The rate of increase in Ø value is only marginal beyond a certain value of cement content (approx. 15%). The effect of curing period is more significant at higher percentages of cement than at lower percentages.
