Landslides and mudslides caused by "heavy rain" or "earthquakes" are called "slope failures" and are distinguished from "landslides"!
"Landslides" can occur even on gently sloping surfaces compared to slope failures.
They continue to slowly slide every day without stopping, and due to the depth of the sliding surface, the scale of the collapse can be dozens of times larger.
Even if they temporarily stabilize, if the groundwater level rises, sliding can recur, leading to long-term impacts on the region's socio-economic activities.
"Water drainage boring" is construction work aimed at removing water from the ground, as the name suggests.
While "investigation boring" involves vertical drilling (downward), it is also referred to as "horizontal boring" because it drills in a horizontal upward direction.
The drilling diameter ranges from 60mm to 90mm, and the hole length can vary from a minimum of 5m to over 80m for longer ones.
Since the drilled holes would collapse if left as they are, PVC or iron pipes with 4mm holes are regularly arranged and inserted as "hole preservation pipes" down to the bottom of the hole.
Water flowing into the holes of these "hole preservation pipes" is directed to the outlet, thereby discharging groundwater to the surface.
"Water drainage boring" is construction work aimed at suppressing the occurrence and reactivation of landslides.
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