The invention relates to a drilling process for surveying a land
pebble-filled limestone
cave. Different from a traditional process, the drilling process for surveying the land
pebble-filled limestonecave comprises the process steps of (a) measuring a hole position, then adopting a first drilling tool to start drilling, and protecting a wall for a hole drilled at the upper end of a rock
base plane after drilling to the rock
base plane; (b) then drilling a limestone
cave layer top plate surface, cleaning the hole to be below a limestone
cave layer bottom plate surface, then lift-drilling, andrecording the distance between the limestone cave layer top plate surface and the limestone cave layer bottom plate surface; (c) configuring a core
barrel with a
drill bit according to the distance instep (b) so as to form a second drilling tool, then using the second drilling tool to
drill the limestone cave layer bottom plate surface, and keeping the core
barrel with the
drill bit in the drilled hole so as to protect the wall, wherein the wall protecting range is at least from the limestone cave layer top plate surface to the limestone cave layer bottom plate surface; (d) adopting a third drilling tool with the
diameter being smaller than the inner
diameter of the core
barrel for drilling and
coring in the core barrel to a designed hole depth; and (f) after finishing drilling and
coring, taking the core barrel out. The drilling process for surveying the land
pebble-filled limestone cave involved in the invention has high construction efficiency.