{"id":48376,"date":"2023-01-28T08:00:53","date_gmt":"2023-01-27T23:00:53","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=48376"},"modified":"2026-05-12T09:39:20","modified_gmt":"2026-05-12T00:39:20","slug":"ground-anchor-basic-test","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/ground-anchor-basic-test\/","title":{"rendered":"What exactly is the Basic Exam? (In simple terms)"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

I've been conducting basic testing at a certain site for the past few days.<\/p>\n

Have you ever taken the basic exam for ground anchor construction?<\/p>\n

\"Ground<\/p>\n

When performing this type of ground anchor work,The key part is the consolidation layer<\/span><\/strong><\/span>That's it.<\/p>\n

This is the basic test used to verify that, and what the basic test determines is the circumferential friction force (\u03c4).<\/p>\n

(This is written for those who aren't very familiar with ground anchor construction.)<\/p>\n

\"Ground<\/p>\n

In this basic test, the assessment of circumferential friction involves the rock mass and the grout.<\/p>\n

I understand what grout and prestressed steel strands are.<\/p>\n

In the case of natural ground and grout, the N-value varies depending on the region and specific location where the work is being carried out.<\/p>\n

When installing ground anchors, conduct any basic tests specified in the design, if applicable.<\/p>\n

We then determine the length of the anchor body based on those results.<\/p>\n

 <\/p>\n

Estimates for most sites are calculated based on past performance (at nearby sites) and data from geological survey borings conducted at the site in question.<\/p>\n

However, basic tests are conducted for reasons such as outdated design calculations, limited track record, or lack of data.<\/p>\n

That said, there are some standard estimates, so I usually use this one below.<\/p>\n

\"Ground<\/p>\n

Basically, the higher the N-value, the greater the friction.<\/p>\n

 <\/p>\n

I\u2019ll give a rough overview of how the basic exam is administered.<\/p>\n

1. Drill a hole up to the design anchor point.<\/span><\/strong><\/span><\/p>\n

2. Insert an anchor with a fixed length of 1 meter into the mounting area. (There are other methods as well.)<\/span><\/strong><\/span><\/p>\n

3. Inflate the rubber packer located directly behind the 1-meter anchoring section.<\/span><\/strong><\/span><\/p>\n

4. Inject grout only into the anchorage section.<\/span><\/strong><\/span><\/p>\n

5. Do not inject the free end. (In some cases, the free end may be flushed.)<\/span><\/strong><\/span><\/p>\n

6. Wait for the grout to set<\/span><\/strong><\/span><\/p>\n

7. Install the pressure plate and tighten it.<\/span><\/strong><\/span><\/p>\n

8. As a general rule, maintain tension until the anchor can be pulled out; however, for safety reasons, set the load to 0.9 times the yield tensile strength or less.<\/span><\/strong><\/span><\/p>\n

9. Determine the load at which the bolt pulls out. If it does not pull out, the load is equal to or greater than the design value.<\/span><\/strong><\/span><\/p>\n

10. Perform the design calculations again using the circumferential friction coefficient \u03c4 obtained from the test to determine the anchor length.<\/span><\/strong><\/span><\/p>\n

 <\/p>\n

This is the basic test for this series of procedures.<\/p>\n

If you have a general understanding of this, I think you won\u2019t feel anxious when it comes time to actually do the work on-site.<\/p>\n

 <\/p>\n

Ground anchor work is interesting because it operates in parts of the mountain that you can\u2019t see.<\/p>\n

It\u2019s really fascinating to derive the values for the natural ground in this way, based on theory.<\/p>\n

That's probably why I like this kind of work, lol.<\/p>\n

It's fun to drill the holes yourself, get nervous while checking the numbers, and then recalculate, isn't it? lol<\/p>\n

 <\/p>\n

When you take the basic exam, please be sure to work through it all the way to the end (the stability calculation).<\/p>\n

You can easily calculate this simply by changing the value for circumferential friction.<\/p>\n

I feel like that will help me understand ground anchors even better!<\/p>\n

 <\/p>\n

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

Hello, everyone. This is Enta. I\u2019ve been conducting preliminary tests at a job site for the past few days. Have you ever done a preliminary test for ground anchor work? When performing this kind of ground anchor work, the key factor is the anchorage layer. This preliminary test is designed to verify that\u2026<\/p>","protected":false},"author":2,"featured_media":8740,"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":[28],"tags":[48,1108,1659,2077,3454],"class_list":["post-48376","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ground-anchor","tag-48","tag-1108","tag-1659","tag-2077","tag-3454"],"acf":[],"yoast_head":"\n\u57fa\u672c\u8a66\u9a13\u3063\u3066\u306a\u3093\u305e\u3084\uff1f\uff08\u7c21\u5358\u306b\uff09 - \u65b0\u30a8\u30f3\u30bf\u306e\u6cd5\u9762\u7ba1\u7406\u587e<\/title>\n<meta name=\"description\" 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