{"id":7210,"date":"2018-06-05T08:00:17","date_gmt":"2018-06-04T23:00:17","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=7210"},"modified":"2026-05-17T15:00:23","modified_gmt":"2026-05-17T06:00:23","slug":"sensitivity-to-changes-in-soil-quality","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/soil-quality-change-sensitivity\/","title":{"rendered":"Sensitive to Changes in Soil Conditions | The Observational Skills of a Drilling Operator"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>The other day, I went on a little hike.<\/p>\n<p>There\u2019s a place called the Gozaisho Ropeway, and there\u2019s a mountain there called Mount Gozaisho.<\/p>\n<p>Well, since there's a cable car, I guess there must be a mountain (lol)<\/p>\n<p>There was a trailhead suitable for beginners, so my child and I hiked up for about an hour before turning back halfway.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-7211\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/IMG_2615-600x450.jpg\" alt=\"Mount Gozaisho Hike\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/IMG_2615.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/IMG_2615-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>I had planned to turn back partway from the start, but people I passed asked, \u201cHuh! Are you leaving now?\u201d and \u201cIs it okay to bring kids?\u201d<\/p>\n<p>People would say things like, \u201cAren\u2019t you dressed a little too lightly?\u201d and every time we passed each other, they\u2019d say, \u201cHi there,\u201d \u201cHey,\u201d or \u201cGood luck!\u201d<\/p>\n<p>People say things like that, and so on.<\/p>\n<p>Plus, this mountain is a pretty popular spot, so there are lines...<\/p>\n<p>It\u2019s like, \u201cHow many times do I have to say this?!\u201d (lol)<\/p>\n<p>But they don't know that. I've been fixing things all over this mountain as part of the construction project. (I know it quite well.)<\/p>\n<p>And actually, the purpose of this trip isn\u2019t so much the hike as it is the granite.<\/p>\n<p>\"I told my kids, 'When this granite weathers, it turns into nice sand!' so we came here to see it for ourselves.\"<\/p>\n<p>That was the only reason I was dressed so lightly (lol)<\/p>\n<p>Sorry that my goals are different from everyone else's lol<\/p>\n<p>But the mountains have been so noisy lately!<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>But that's beside the point.<\/p>\n<h3>When the soil conditions at the site differ from those specified in the design<\/h3>\n<p>It happens all the time, doesn't it?<\/p>\n<p>A particularly common scenario is when the location of the exploratory borehole is significantly farther away from the construction site.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-7212\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/5d7a6070459301b3126ac2604efbf1fd-600x435.jpg\" alt=\"Floor Plan\" width=\"600\" height=\"435\" \/><\/p>\n<p>For example, if construction is to be carried out over three phases, exploratory drilling is performed during the design phase.<\/p>\n<p>However, due to budget constraints, we may only visit one location.<\/p>\n<p>I suppose they try to aim for the average as much as possible, but that rarely happens, and I think there are often situations where the actual implementation leaves you scratching your head.<\/p>\n<p>No rocks in the anchorage layer? Does the anchorage layer look different from the design??<\/p>\n<p>That's how it works.<\/p>\n<p>&nbsp;<\/p>\n<p>However, while it\u2019s quite difficult to make a judgment on-site, we\u2019ll start by collecting and examining a sample of the slime from the attachment site.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-7214\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/04162646c7e0b028bfcf23d308b98c15.jpg\" alt=\"Bar Chart\" width=\"518\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/04162646c7e0b028bfcf23d308b98c15.jpg 518w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/04162646c7e0b028bfcf23d308b98c15-300x266.jpg 300w\" sizes=\"auto, (max-width: 518px) 100vw, 518px\" \/><\/p>\n<p>Next, please take a look at this table of borehole log data. (Be sure to obtain the design calculations from the local government office before beginning construction.)<\/p>\n<p>The soil classification, color, and other details are listed here, so please compare them.<\/p>\n<p>Since the N-value is listed, how hard was the rock during drilling?<\/p>\n<p>We'll compare the on-site conditions with the design, taking all of that into account.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7215\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/e1496677426599.png\" alt=\"Discuss\" width=\"400\" height=\"372\" \/><\/p>\n<p>And if I think, \u201cThat\u2019s clearly wrong!\u201d I\u2019ll discuss it with the local government.<\/p>\n<p>As we continue our discussions with the government office, a representative from the consulting firm will also join us, so we\u2019ll include them in the conversation.<\/p>\n<p>If that happens, work on-site will be temporarily halted.<\/p>\n<p>&nbsp;<\/p>\n<p>Everyone hates it when this project comes to a halt. I get it.<\/p>\n<p>However,<span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">If you stop, things will definitely go in a better direction.<\/span><\/strong><\/span><\/p>\n<p>Holding a meeting even if it means halting construction is an action that helps bring the site up to a good standard.<\/p>\n<p>It's far better than just plowing ahead and ending up in a terrible mess later on.<\/p>\n<p>&nbsp;<\/p>\n<p>No matter what the outcome, it can be quite challenging when the soil conditions are different.<\/p>\n<p>When considering design changes, both anchor installers and rebar installers must,<\/p>\n<p>Make the attachment section longer.<\/p>\n<p>Increase the bore diameter to increase circumferential friction.<\/p>\n<p>Increase the free length.<\/p>\n<p>Make the rebar longer. Make it thicker.<\/p>\n<p>There are various factors to consider, but since there\u2019s an original design philosophy to follow, we can\u2019t just do whatever we want.<\/p>\n<p>These design changes are intended to stay true to the original design.<\/p>\n<p>&nbsp;<\/p>\n<p>I did this the other day: I collected soil samples using a rotary percussion sampler at 0.5-meter intervals, and<\/p>\n<p>Sometimes we ask them to make their judgment based on soil that is as undisturbed as possible.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-7216\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/06\/Blue_Mesa_Painted_Desert-600x400.jpg\" alt=\"Changes in Soil Composition\" width=\"600\" height=\"400\" \/><\/p>\n<p>While this will mostly involve design changes, the process leading up to that point is extremely important, so please document everything with photos and samples.<\/p>\n<p>It is very important to explain the reasons for the design change.<\/p>\n<p>When performing anchor work, it\u2019s generally better to be sensitive to changes in soil conditions.<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. The other day, I went on a little hike. There\u2019s a place called the Gozaisho Ropeway, and there\u2019s a mountain there called Mount Gozaisho. Well, since there\u2019s a ropeway, there\u2019s obviously a mountain there (lol). There\u2019s a trailhead there that\u2019s suitable for beginners, so I went with my kids\u2026<\/p>","protected":false},"author":2,"featured_media":7217,"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_total_topic_count_hidden":0,"_bbp_total_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[42],"tags":[48,116,596,728,1501],"class_list":["post-7210","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-civil-design","tag-48","tag-116","tag-596","tag-728","tag-1501"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.5 (Yoast SEO v28.5) - 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