Prospects of using dynamic compaction when placing ASH materials and preparing bases for ASH dumps

Conclusions

• 1. There are considerable prospects of the practical use of dynamic methods of compaction with the use of heavy tampers, vibrating rollers, and explosives for compacting the body of an ash dump in the “dry” method of storing soils of the enclosing embankments and soils in the base of an ash dump with the “dry” and hydraulicking method of storing, in road construction, and when constructing earth structures with the use of ash materials.

• 2. In the case of dynamic compaction of ash materials and soils in the base of ash dumps, the useful volume should be increased by 20–40% compared with placement of ash materials by the hydraulicking method and by 10–30% compared with compaction by static action, including mechanical.

• 3. The shear strength increases considerably as a result of dynamic compaction. In particular, the angle of internal friction of loose ash deposits increases 8–12%, and the cohesion coefficient of compacted ash can be increased to 0.04–0.06 MPa. It is possible to reduce the permeability coefficient of ash and soils of the base by a half-order to one or two orders.

• 4. The use of dynamic compaction promises considerable economic advantages. In particular, prolonging the service life of an ash dump by 1/3 makes it possible to reduce (owing to the absence of the need to construct a new ash dump) capital expenditures for constructing ash dumps by 20–40% with assurance of a high service reliability.

• 5. This work should be done both for the purpose of further in-depth scientific and practical studies and, mainly, for the purpose of developing and introducing the necessary equipment and highly efficient technologies for dynamic compaction of ash materials of the enclosing embankments and preparation of the bases for ash dumps, compaction of road beds, etc., on various objects. For this there are domestic specialists able to competently solve this problem with the necessary organizational support and financing of the appropriate departments and organizations of the object of use.