{"id":48279,"date":"2023-01-13T15:11:54","date_gmt":"2023-01-13T06:11:54","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=48279"},"modified":"2026-05-17T00:33:02","modified_gmt":"2026-05-16T15:33:02","slug":"extensometer-strain-gauge-2","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/extensometer-strain-gauge-2\/","title":{"rendered":"Extensometers and Strain Gauges | How Ground Extensometers Are Used to Monitor Landslides"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

Have you ever seen something like this on a slope?<\/p>\n

\"Installation<\/p>\n

It's just standard practice in our industry, isn't it?<\/p>\n

That's right!<\/p>\n

It's an extensometer!<\/strong><\/span><\/p>\n

We are monitoring landslide activity.<\/p>\n

What Is a Ground Deformation Meter?<\/strong><\/span><\/a><\/span><\/span>(Association for Slope Disaster Prevention Technologies)
\n<\/span><\/strong><\/span><\/p>\n

People go to locations where observations can be made easily, insert a device called a data logger, and retrieve the data. (These days, this is often done using SD cards, etc.)<\/p>\n

They'll send data to places that would be difficult or time-consuming for people to reach (such as via telephone lines).<\/p>\n

Basically, they run on batteries. These days, many people use solar panels to store electricity and power them.<\/p>\n

Along national highways, for example, there are devices equipped with cameras and even alarms.<\/p>\n

The hard part is that collecting data from this device every day is a real hassle, lol.<\/p>\n

A long time ago, this device was installed at a Ministry of Land, Infrastructure, Transport and Tourism site, and it really gave us a hard time.<\/p>\n

Back then, there was no way to transfer data, so we not only collected data but also replaced batteries.<\/p>\n

Sometimes animals kick these things, so the alarm goes off at night, or it gets shaken by heavy rain and sets off the alarm\u2014it\u2019s really a hassle.<\/p>\n

\"Extensometer<\/p>\n

There are lines like this inside the PVC pipe.<\/p>\n

When you touch this, the data logger measures the displacement. It makes you want to give it a little tap (but you'll get scolded, won't you?).<\/p>\n

Generally speaking, at sites equipped with extensometers, you\u2019ll also find devices like this.<\/p>\n

\"\"<\/p>\n

This is a device called a strain gauge.<\/p>\n

What Is a Strain Gauge? Japan Meteorological Agency<\/a><\/span><\/strong><\/span><\/p>\n

We are measuring the strain in the ground.<\/p>\n

We are measuring the surface layer of the ground with an extensometer while simultaneously measuring the interior of the ground with a strain gauge.<\/p>\n

As with the above, data is collected either automatically or manually.<\/p>\n

Our slope stabilization company continues to provide ongoing maintenance after construction, including anchor work and horizontal boring.<\/p>\n

Once the construction work takes effect, no displacement will be observed on the extensometers and strain gauges.<\/p>\n

Conversely, there are cases where displacement appears on the strain gauge.<\/p>\n

When tension is applied to an anchor, pressure is exerted on the rock, which can sometimes cause the rock to push back.<\/p>\n

Actually, since we can't see what's happening inside the earth, I can only speculate, lol.<\/p>\n

\"Strain<\/p>\n

Areas where this equipment is installed are regions prone to landslides.<\/p>\n

Also, if you don't take extra care when working near this equipment, it will cause more trouble. (It is necessary to remind the workers of this.)<\/p>\n

Be sure to check the instructions for using water, as well as the application methods and sequence.<\/p>\n

In particular, great care must be taken regarding the displacement of the mountain during anchor installation.<\/p>\n

Just ignore the coach who\u2019s wandering around with a data logger every day\u2014lol.<\/p>\n

This equipment is generally managed by a construction consulting firm, but during construction, management may be outsourced to the construction company, and<\/p>\n

During construction, they give me a data logger and tell me to send the data every week. Just install an automated system for me!<\/p>\n

I think there are plenty of people who feel that way (lol)<\/p>\n

It\u2019s easier now, though, since I don\u2019t have to make copies from rolls of paper like I used to. (Are the people who know what this is talking about over 40?)<\/p>\n

 <\/p>\n

See you later.<\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. Have you ever seen something like this on a slope? It\u2019s a common sight in our industry, isn\u2019t it? That\u2019s right! It\u2019s a strain gauge! It\u2019s used to monitor landslide activity. What Is a Strain Gauge? (Slope Disaster Prevention Technology Association) Places where monitoring is easy\u2026<\/p>","protected":false},"author":2,"featured_media":6059,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[120,813,1205,1206,1707,5535],"class_list":["post-48279","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-others","tag-120","tag-813","tag-1205","tag-1206","tag-1707","tag-5535"],"acf":[],"yoast_head":"\n\u4f38\u7e2e\u8a08\u3068\u3072\u305a\u307f\u8a08\uff5c\u5730\u76e4\u4f38\u7e2e\u8a08\u3067\u5730\u3059\u3079\u308a\u3092\u89b3\u6e2c\u3059\u308b\u4ed5\u7d44\u307f - 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