Treating particulate and connecting slab portions

1. A method of treating particulate, the method comprising:

selecting a load based on a planned in use loading of the particulate;

applying the load to the particulate;

injecting material below the load;

allowing the injected material to set;

creating a hole in the set material;

injecting through the hole further material below the set material; and

removing the load.

2. The method of claim 1 wherein the injected material is an expanding material.

3. The method of claim 1 wherein the load is further particulate.

4. The method of claim 1 wherein the load is selected to exert a pressure of at least 1,000 kg/m 2 (1.4 psi) averaged over an area of the particulate in need of treatment.

5. The method of claim 1 including sequentially so injecting at a plurality of locations.

6. The method of claim 5 wherein a first of the sequential injections is in substance at a centre of an area of the particulate in need of treatment.

7. The method of claim 1 including reducing a rate at which the material is injected to allow time for at least one effect of injection to become apparent.

8. The method of claim 7 wherein the reducing is or includes periodically pausing the injection.

9. The method of claim 1 including, prior to the injecting, at least partly drying the particulate to reduce resistance to injection.

10. The method of claim 9 wherein the at least partly drying is to reduce ground water pressure by about 40 kPa (5.8 psi) to about 80 kPa (11.6 psi).

11. The method of claim 9 wherein the at least partly drying is or includes vacuuming.

12. The method of claim 1 including monitoring at least one effect of injection and discontinuing injection in response to the monitoring.

13. The method of claim 12 wherein the monitoring includes monitoring at two or more spaced locations.

14. The method of claim 12 wherein the monitoring is or includes monitoring surface displacement.

15. The method of claim 1 wherein the particulate is supporting a structure.

16. The method of claim 15 wherein the structure is a slab or slab portion.

17. The method of claim 15 including sequentially injecting material below the structure to a plurality of injection points spaced about and in proximity to a periphery of the structure's footprint on the particulate.

18. The method of claim 15 wherein the injecting is injecting through at least one hole in the structure.

19. The method of claim 18 including creating the at least one hole in the structure.