METHOD TO RESTORE ABANDONED PITS FOR CONSTRUCTION OF CEMETERY Russian patent published in 2014 - IPC E21C41/32 

FIELD: construction.

SUBSTANCE: method includes separate excavation, displacement and piling of soil layer and overburden rocks into separate band dumps, mining of a pit field, filling of the mined space with construction wastes to the border of the upper level of ground water, and the composition of the wastes is close to natural minerals with different size of fractions, in layers with subsequent compaction of each layer, laying of a draining layer with construction wastes having thickness of not more than 0.6 m and with fraction size of 150-200 mm. At the same time they first perform design and planning works for construction of roads, passages, hydraulic engineering and land reclamation structures, then above the draining layer they do primary fill of the mined space of the pit with a mixture made of overburden rocks and ground construction wastes with fraction size of the latter not more of 100 mm that are mixed in equal proportions. Fill is carried out to complete filling of the mined space of the pit, then a layer of soil mixture with seeds of perennial herbs of meadow-weed group is applied onto the surface planed with a bulldozer, and at least in one year they perform final planning, then ploughing of the planed surface with subsequent levelling, afterwards roads are connected, and hydraulic engineering and land reclamation structures are arranged, and the restored area is divided into sections to bury remains.

EFFECT: reduced volumes of soil excavation for creation of a fertile layer and improvement of environmental situation.