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Vibro Stone Columns

Updated: Jun 3

Vibro stone columns are an array of crushed stone pillars placed with a vibrating tool into the soil below a proposed structure. Vibro stone columns offer a highly economical and sustainable alternative to piling and deep foundation solutions. This method of ground improvement is called the Vibro replacement. Such techniques increase the load-bearing capacity and reducing settlement. This picture is taken from CIAL site on the year of 2015


Construction And Installation: 1. Ground Improvement techniques contain no cement, concrete or steel, only using below 75mm well-graded stones for improving bearing capacity of the soil; The design of stone column shall comply with IS 15284 2. The practical depth of the stone column considered only maximum 12m 3. Stone column ground improvement involves adding vertical columns of stone into the ground to a depth of at least 4m below the ground surface. 4. The column shall be formed adding lifts having each lift height between 600cm to 1000cm 5. Recording of data should be done as given in IS 15284 6. Engineer shall be monitoring the final depth as well as the quality of metal to be used 7. Graded stones shall be confirmed by IS 383 8. The Aggregates are passing through the bucket and reach the hard strata by vibration 9. The stone column shall be constructed as vertical as possible 10. The column must be positioned in the midpoint


Field Loading Test: The test shall be conducted on a single as well as group of a minimum of three columns in accordance With IS 15284{part-1}

Single Column Test: The test load shall be applied at increments that do not exceed 1.5 times the design load. Each stage shall be maintained until the settlement rate is less than 0.1mm/30 min. The test load shall be maintained for a minimum period of 24hours.

Advantages:

1. Reduce total and differential settlement. 2.Increase the bearing capacity of strata to make it possible to use shallow foundation 3. Accelerates the rate of consolidation in cohesive soil by providing drainage to water. 4.Low cost when you compare to the piling.


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Jack Infrastructures

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