A Novel Cluster Center Estimation Algorithm with Hybrid Partitional Clustering

A rock formation may be stabilized by introducing a settable stabilizing substance into boreholes around non-load bearing filler elements in the boreholes, and allowing the substance to set. The use of filler elements reduces the volume of a settable substance needed in the holes. Thereby the cost is reduced because the filler elements may be of a less expensive material than the settable substance. Different types of filler elements are also disclosed.