Reflecting on Afforestation Efforts from 30 Years Ago to Plan for the Future
Hello, everyone. This is Enta. Landscaping projects used to be all the rage, but they’re becoming less and less common these days, aren’t they? Here’s a project from back in the day—this slope was probably built over 30 years ago. The reason is the treatment at the top. It’s been exactly 30 years since I entered this industry (it’s been a long time, but it felt like a blink of an eye…)
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…
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…
Why I Believe Drainage Boring Is Essential in Slope Stabilization Projects, Considering Earth Pressure
Hello, everyone. This is Enta. Are there any bamboo groves near your job site? Well, as slope stabilization contractors, we tend to work in areas with plenty of bamboo groves quite often, don’t we? For example, let’s say this bamboo grove slides, and we’ve already installed slope reinforcement frames and rebar. After the bamboo grove slides, the soil starts to rot…
Seriously Considering the Dynamics of the Aratozawa Landslide Leads to Groundbreaking Mitigation Measures (From “Little by Little, Part 2”)
On June 14, 2008, the Iwate-Miyagi Inland Earthquake struck. I went on a field survey, but since I haven’t been involved with it since then, I don’t know the details. One of the field trips at this September’s National Conference of the Japanese Society for Landslide Science was to the Aratozawa landslide…
I think it's about time the drilling angles for dewatering borehole construction were revised.
Hello, everyone. This is Enta. I think I’ve written quite a bit on my blog before about the angle used in dewatering boreholes. The design specifications state an angle of about 5 to 10 degrees. So, what’s the deal with this angle? How is the angle determined for dewatering boreholes? …
I’ll list some thoughts I’ve had about the future of the dewatering rock bolt method, as well as some feedback I’ve received.
Hello, everyone. This is Enta. Looking ahead, I’ve been thinking about the future prospects of the dewatering rock bolt method. I’ve received various opinions and insights on this topic from many people. I’d like to briefly summarize them here. 1. Aging infrastructure…