Appropriate Design of Subsoilers with Pressurized Fluid Injection (Part 4)

Soil Failure Rate in Relation to Flow Rate of Injected Water

Abstract

The optimum model shapes of pan-breakers and injectors with pressurized fluid injection were determined by a basic soil bin test injecting air in the previous report. At this test, the characteristics of soil failure was changed by soil moisture, ie. collapse failure, fracture failure and plastic flow. The maximum rupture distances were obtained when the fracture failure took place. This report deals with the characteristics of soil failure by water injection. Liquid such as water saturates the soil around a nozzle port and the rupture distances on soil surface would be changed.
The results showed that with pan-breakers and under the soil moisture with fracture failure, both rupture distances and disturbance energy decreased to about 50% by increasing water flow rate from 0 to 0.45kg/s. With injectors, rupture distances decreased to about 50% but disturbance energy was constant regardless of water flow rate.