Let's Talk About Collapse Prevention Measures During Construction! (Part 3)
Hello, everyone. This is Enta. This is a continuation of my previous post. Why Do Slopes Under Construction Collapse? (Part 1) Relieving Pressure and Draining Injected Water Before a Collapse (Part 2) In Parts 1 and 2, I explained the reasons why slopes under construction collapse and discussed draining injected water as a countermeasure. This time…
Let's Talk About Collapse Prevention Measures During Construction! (Part 2)
Hello, everyone. This is Enta. This is a continuation of my previous post. “Slope Collapse During Construction: Water Is Almost Always the Cause (Part 1)” In Part 1, I wrote about how the safety factor (Fs) does not reach 1.2 during construction, how water tends to concentrate on the weakest points, and how sheet protection is only a temporary measure…
The Effectiveness of Drainage Boring (Private Construction Projects)
Hello, everyone. This is Enta. The other day, I went to check out a site where we had previously installed drainage boreholes. The project was a private-sector job where part of the slope had already collapsed, and the client wanted to prevent further collapse. There was no stonework or anything like that—it was just a bare hillside. At the top…
Retaining Wall Reinforcement Methods from a Slope Engineer’s Perspective (Part 5): Construction Methods
Hello, everyone. This is Enta. In the comments on my recent post (Part 2), someone pointed out some issues with my drawings lol. For now, I’m drawing them roughly so everyone can understand them easily. When someone points that out, I’m like, “Are you nitpicking the details?!” lol. Please keep in mind that these are just conceptual diagrams. This is my…
Rain from the mountains runs along the ridges, seeps into the bedrock, and lifts the deep bedrock.
Hello, everyone. It’s Enta here. Did you all get to rest up during the three-day weekend? As usual, I’ve been busy with nothing but quotes and more quotes, lol. Well, that’s just my normal routine. I was planning to go for a run in the mountains this weekend, but it rained the day before. I found tracks like these along the mountain ridge. It rained…
工種、削孔機械によっての削孔誤差があるのか？
皆さんこんにちは。 エンタです。 先月、新建新聞社のセミナーの講師をさせて頂きました。 ひと事で言えば僕のセミナー内容は「山の水抜け！」だけです。 コレをコンサルの方がいかに設計に入れてお金に反映してくれるかが難しい所ですけどｗｗｗ（是非お…
I want people to understand more about the effectiveness of dewatering in shallow landslides!
Hello, everyone. This is Enta. The other day, I wrote about how dewatering boreholes and dewatering rock bolts are effective in reducing soil pressure during heavy rain. By drilling temporary dewatering boreholes, we can prevent landslides in advance and provide ongoing protection against them! The cause of the embankment collapse in Noto was…
Water is definitely the cause of the embankment collapse in Noto! How should we deal with excessive pore water pressure from the mountainside during heavy rain?
Hello, everyone. This is Enta. Did you see the news about the collapse of National Route 249 in Ishikawa due to the heavy rain the other day? Shigekazu Noto, Director of the Nakanoto Civil Engineering Office, said, “There was an earthquake, so it’s possible that cracks formed in the mountain, causing the water flow to change. Because water seeped into the embankment…”
Drilling temporary drainage boreholes can prevent collapse in advance and provide ongoing protection against it!
Hello, everyone. This is Enta. Thanks to the heavy rain in Noto the other day, I was able to capture some really great footage. Take a look. Water is coming out from the top as well—this is the drainage pipe we installed as a safety precaution (we install these proactively as part of our service). It’s about 4 meters long. We drilled a 65-diameter hole and installed a perforated pipe…