{"id":58955,"date":"2026-04-01T08:00:59","date_gmt":"2026-03-31T23:00:59","guid":{"rendered":"https:\/\/norimen.net\/?p=58955"},"modified":"2026-05-16T18:02:49","modified_gmt":"2026-05-16T09:02:49","slug":"water-boring-effect-private","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/water-boring-effect-private\/","title":{"rendered":"The Effectiveness of Drainage Boring (Private Construction Projects)"},"content":{"rendered":"

<\/p>\n

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

The other day, I went to check out the site where we had previously installed drainage boreholes.<\/p>\n

As for the scope of the work, this was a private-sector project where part of the structure had already collapsed, and the client requested that we prevent any further collapse.<\/p>\n

There are no stone walls or anything like that; it's just a bare mountainside.<\/p>\n

There is a bamboo grove at the top.<\/p>\n

\"Bamboo<\/p>\n

\"Every time it rains, the bamboo sways, and it's scary,\" she said.<\/p>\n

And apparently, there\u2019s quite a bit of murky water.<\/p>\n

Although large machinery couldn't be brought onto the site, as for the construction method, for the time being...Reinforcement Bar Insertion and Drainage Boring<\/strong>We addressed the issue using this combination.<\/p>\n

Railway companies such as JR frequently use dewatering drilling methods, and I believe this method is best suited for dealing with small-scale collapses like these.<\/p>\n

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Why Is Drainage Boring Effective Against Minor Landslides?<\/h2>\n

Here's a brief explanation for the general public.<\/p>\n

One of the main causes of landslides isRise in pore water pressure<\/strong>That's it.<\/p>\n

When water accumulates in the soil, the soil becomes more slippery.<\/strong>That's common knowledge among us in the industry.<\/p>\n

When rainwater seeps into the ground, water pressure builds up in the spaces between soil particles.<\/p>\n

When this pressure increases, the soil particles can no longer hold their ground, so the water lifts the soil and it slips right out from under them.<\/p>\n

It\u2019s easier to understand if you imagine a sandbox: sand that\u2019s saturated with water crumbles more easily than sand that\u2019s completely dry, right?<\/p>\n

It's the same principle as that.<\/p>\n

That's whyIf you drain the water, the soil will return to a state where it can hold its shape.<\/strong>\u3002<\/p>\n

That is the essence of dewatering drilling.<\/p>\n

In soil mechanics, shear strength is expressed as \u03c4 = c\u2019 + (\u03c3 \u2212 u) tan \u03c6\u2019.
\n\"Guidelines for Road Earthworks: Cut Works and Slope Stabilization\"<\/p>\n

 <\/p>\n

Draining the water will restore the effective stress, causing the slope to stabilize.<\/p>\n

It goes without saying that it\u2019s incredibly effective\u2014the mechanism behind it is crystal clear.<\/p>\n

Drainage boring is also a standard method for slope disaster prevention measures in the railway sector and is clearly outlined in the manuals of various companies.<\/p>\n

This construction method is included in the Ministry of Land, Infrastructure, Transport and Tourism\u2019s \u201cGuidelines for Landslide Prevention Technologies\u201d and has a very extensive track record of use in public works projects.<\/p>\n

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My Design Focus: Primarily Reinforcement Insertion Methods, with Drainage Boring Methods as a Secondary Focus<\/h2>\n

\"Drainage<\/p>\n

As for my recent design trends, first of all,Reinforcing Bar Installer<\/strong>, and as a supplementDrainage Boring Worker<\/strong>...is the norm.<\/p>\n

The reason is that it makes it easier for rebar installers to explain things to the government office, lol.<\/p>\n

To be honest, because I\u2019m still inexperienced, I can\u2019t quantify the dewatering borehole work and give a clear explanation like, \u201cBased on this theory, this is why we need this many boreholes!\u201d<\/p>\n

That's the bottom line.<\/p>\n

The rebar insertion method is a conventional technique that government agencies find easy to understand, andYou can quickly create and submit design calculation sheets<\/strong>...is one of its strengths.<\/p>\n

Even for private construction projects, if asked to explain, it\u2019s easier to convince people by saying, \u201cThis is the standard construction method used in public works projects.\u201d<\/p>\n

If anything, the design is a breeze, lol (even though I know I shouldn't be thinking this...)<\/p>\n

While addressing surface collapse by using rebar insertion to increase the strength of the natural ground,<\/p>\n

If you drain the water using a dewatering drilling method to prevent the soil pressure from increasing any further,Even better<\/strong>That's the idea.<\/p>\n

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How much water actually came out?<\/h2>\n