Indices structural differences upper zones Ordovician limestone filling and a method of determining

摘要

Structural discrimination indexes of an ordovician limestone top filling zone and a determination method, coal field-based ordovician limestone top filling zones of a buried depth of more than 300 m, according to structural discrimination indexes of the drilling unit water inflow q value, the underground drilling dewatering test Q value and the penetration test K value, are divided into three types of the ordovician limestone top water-resisting filling zones: a water-resisting filling zone, a weak water-resisting filling zone and a water-enriched zone. The water-resisting filling zone can be directly used as a water-resisting layer, the weak water-resisting filling zone can be used after having been improved into the water-resisting layer by grouting. The structural discrimination indexes of the method are obtained from conventional hydrological tests, and the method is relatively simple to obtain and easy to operate by field staffs.