{"id":4238,"date":"2017-08-18T08:00:11","date_gmt":"2017-08-17T23:00:11","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=4238"},"modified":"2026-05-15T02:46:35","modified_gmt":"2026-05-14T17:46:35","slug":"explanation-of-rock-joint-patterns","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/rock-joint-pattern-explanation\/","title":{"rendered":"What Are Joints? A Slope Engineer Explains Regular Fractures in Rock Masses, Such as Columnar Jointing"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p>Now that the Obon holiday is over, we\u2019re gearing up for the end-of-year rush, but things seem a bit hectic, and I can\u2019t quite see the light at the end of the tunnel.<\/p>\n<p>I wonder what this uneasy feeling is...<\/p>\n<p>I suppose we\u2019ve reached a point where public-sector organizations can no longer rely solely on public works projects.<\/p>\n<p>No, no, I know that.<\/p>\n<p>I'm sure everyone knows this, right?<\/p>\n<p>He said that public works projects alone aren't enough to make a living or keep a company afloat.<\/p>\n<p>Running a company is tough, isn't it?<\/p>\n<hr \/>\n<p>But that's beside the point.<\/p>\n<p>Do you know what a joint is?<\/p>\n<p>I don't think there's anyone working in design or consulting who isn't familiar with it.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4239\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/99f36e4e1d19b5ec06c9e5d8b5467838.jpg\" alt=\"\" width=\"345\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/99f36e4e1d19b5ec06c9e5d8b5467838.jpg 345w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/99f36e4e1d19b5ec06c9e5d8b5467838-225x300.jpg 225w\" sizes=\"auto, (max-width: 345px) 100vw, 345px\" \/><\/p>\n<h3>Jie Li<\/h3>\n<p>From Wikipedia<\/p>\n<p><em><strong>A \"joint\" (Japanese: setsuri) refers to a regular fracture developed within a rock mass in which no displacement is observed on either side. <\/strong><\/em><\/p>\n<p><em><strong>It occurs when magma and other materials cool and solidify, or during crustal movements.<\/strong><\/em><\/p>\n<p>Simply put, it refers to a regular fracture.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4241\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/6886bee80fa9f0ea0145cdf46ec609de.jpg\" alt=\"\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/6886bee80fa9f0ea0145cdf46ec609de.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/6886bee80fa9f0ea0145cdf46ec609de-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>This is what's called columnar jointing.<\/p>\n<p>It's strange, isn't it?<\/p>\n<p>When lava solidifies, it contracts toward the center.<\/p>\n<p>As it contracts, some parts contract to the right and others to the left.<\/p>\n<p>That boundary creates a hexagon like the one in the photo above.<\/p>\n<p>If you contract from six directions toward the center, the boundaries of the six faces will form a hexagon.<\/p>\n<p>It's one of nature's wonders, isn't it?<\/p>\n<h3>Masa-ization<\/h3>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4240\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/af20b664ed7afa168c918032a67b06f9.jpg\" alt=\"\" width=\"600\" height=\"460\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/af20b664ed7afa168c918032a67b06f9.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2017\/08\/af20b664ed7afa168c918032a67b06f9-300x230.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>I found this online, but since it\u2019s easy to understand, I decided to share it.<\/p>\n<p>The picture above shows granite; the parts that haven't weathered are solid, but<\/p>\n<p>Granite is broken down into fine particles by weathering caused by wind and rain, eventually turning into silt.<\/p>\n<p>We call that \"making the worst-case scenario a reality.\"<\/p>\n<p><span style=\"font-size: 18px;\"><strong><span style=\"color: #0000ff;\">It turns into masha as a result of weathering.<\/span><\/strong><\/span><\/p>\n<p>In short, it means it turned into sand through weathering.<\/p>\n<h3>I can't help but look at the mountain<\/h3>\n<p>We at Slope Works pay special attention to the shape and atmosphere of the mountains.<\/p>\n<p>\"This looks steep,\" \"That looks gentle,\" \"This looks easy to climb\"\u2014no matter where I go, there are slopes everywhere, and I find myself constantly thinking about them.<\/p>\n<p>I guess I'm just a slope idiot, lol.<\/p>\n<p>I just can't help but notice things like, \"That's some great workmanship,\" or \"Hey, that part's slippery!\"<\/p>\n<p>The other day, when I went to the Itadori River in Gifu Prefecture, I just couldn't stop thinking about the river rocks.<\/p>\n<p>I'm concerned about the joints, and I'm concerned about the soil composition...<\/p>\n<p>So, that\u2019s it for this time\u2014just a little bit about rock types, lol.<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. The Obon holiday is over, and we\u2019re gearing up for the end-of-year rush, but things are a bit hectic and it feels like there\u2019s no end in sight. I wonder what\u2019s causing this uneasy feeling\u2026 I guess we\u2019ve reached a point where public-sector organizations can no longer rely solely on public works projects. Well\u2026<\/p>","protected":false},"author":2,"featured_media":4244,"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":[628,629,630,631,632,633],"class_list":["post-4238","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-others","tag-628","tag-629","tag-630","tag-631","tag-632","tag-633"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ 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