{"id":56296,"date":"2025-10-12T08:00:43","date_gmt":"2025-10-11T23:00:43","guid":{"rendered":"https:\/\/norimen.net\/?p=56296"},"modified":"2026-05-16T17:05:32","modified_gmt":"2026-05-16T08:05:32","slug":"6-methods-for-reinforcing-retaining-walls","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/retaining-wall-reinforce-6-method\/","title":{"rendered":"Retaining Wall Reinforcement Methods from a Slope Engineer\u2019s Perspective (Part 6): Construction Methods"},"content":{"rendered":"<p>Hello, everyone.<\/p>\n<p>This is Enta.<\/p>\n<p><span style=\"color: #ff0000;\"><strong>To Our Free Registered Users<\/strong><\/span><\/p>\n<p>A confirmation email will definitely be sent to the email address you registered!<\/p>\n<p>You must click the confirmation email to complete your registration!<\/p>\n<p>It may have been sent to your spam folder, so please check there.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-56050\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/10\/943125b928769b076c36eff86401403c.jpg\" alt=\"Registration Confirmation Email\" width=\"600\" height=\"326\" \/><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>This is a continuation of the previous post.<\/p>\n<p><strong><a href=\"https:\/\/norimen.net\/en\/retaining-wall-reinforcement-1\/\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\">Retaining Wall Reinforcement Methods from a Slope Engineer\u2019s Perspective (Part 1)<\/span><\/a><\/strong><\/p>\n<p><span style=\"text-decoration: underline;\"><strong><a href=\"https:\/\/norimen.net\/en\/two-types-of-retaining-wall-reinforcement\/\" target=\"_blank\" rel=\"noopener\">Retaining Wall Reinforcement Methods from a Slope Engineer\u2019s Perspective (Part 2): Types of Retaining Walls<\/a><\/strong><\/span><\/p>\n<p><span style=\"text-decoration: underline;\"><strong><a href=\"https:\/\/norimen.net\/en\/3-types-of-retaining-wall-reinforcement\/\" target=\"_blank\" rel=\"noopener\">Retaining Wall Reinforcement Methods from a Slope Engineer\u2019s Perspective (Part 3): Types of Retaining Walls<\/a><\/strong><\/span><\/p>\n<p><span style=\"text-decoration: underline;\"><strong><a href=\"https:\/\/norimen.net\/en\/4-methods-for-reinforcing-retaining-walls\/\" target=\"_blank\" rel=\"noopener\">Retaining Wall Reinforcement Methods from a Slope Engineer\u2019s Perspective (Part 4): Types of Retaining Walls<\/a><\/strong><\/span><\/p>\n<p><span style=\"text-decoration: underline;\"><strong><a href=\"https:\/\/norimen.net\/en\/5-methods-for-reinforcing-retaining-walls\/\" target=\"_blank\" rel=\"noopener\">Retaining Wall Reinforcement Methods from a Slope Engineer\u2019s Perspective (Part 5): Construction Methods<\/a><\/strong><\/span><\/p>\n<h3>3. L-shaped Retaining Wall<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-56297\" style=\"font-size: 16px; font-weight: 400;\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/10\/73ff6159e00848791e5fc0cf31ae7bb6.png\" alt=\"Collapse of an L-shaped Retaining Wall\" width=\"600\" height=\"400\" \/><\/p>\n<p>I made a few minor adjustments to the drawing of the L-shaped retaining wall based on your feedback lol<\/p>\n<p>Please note that this is only a rough sketch.<\/p>\n<p>&nbsp;<\/p>\n<p>Here is a video of an L-shaped retaining wall in civil engineering.<\/p>\n<p>This is the worksite of one of my senior colleagues.<\/p>\n<div class=\"jetpack-video-wrapper\"><iframe loading=\"lazy\" title=\"Highlights of the Cast-in-Place Retaining Wall (L=180 m)\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/xkuSzRharDk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>This is an L-shaped retaining wall built on-site.<\/p>\n<p>In addition to these, there is also a type of precast L-shaped retaining wall.<\/p>\n<p>Simply put, \"secondary products\" are items that are manufactured at a factory, transported to the job site, and installed there.<\/p>\n<p>Although the basic structure is the same, prefabricated products are often used to reduce construction time and for other reasons.<\/p>\n<p>&nbsp;<\/p>\n<p>You're probably thinking, \"Can something like this really fall over?\"<\/p>\n<p>I'm going to fall!<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6349\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1851.jpg\" alt=\"Self-Drilling Rock Bolt and Rock Drill Set\" width=\"600\" height=\"450\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1851.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2018\/03\/IMG_1851-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>This site involved a prefabricated L-shaped retaining wall that had developed cracks at the base.<\/p>\n<p>Also, a section of it had collapsed by about 3 cm.<\/p>\n<p>What\u2019s more, this house even had residential friction piles driven into the ground, so we had to work around them during construction.<\/p>\n<p>The presence of piles indicates that the earth pressure from the backfilled embankment exceeded the expected level, surpassing the earth pressure from the house.<\/p>\n<p>Apparently, cracks appeared after a heavy rain. (According to the landlord)<\/p>\n<p>&nbsp;<\/p>\n<p>Since we can no longer push the fallen object, we\u2019re constructing it so that it won\u2019t move any further (to withstand the earth pressure).<\/p>\n<p>Since this is a confined space with only about 1 meter of clearance behind it, we used self-drilling rock bolts (rebar insertion method) for the installation.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-56302\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/10\/11e8a96139337a2f5f884a8ee61f385a.png\" alt=\"Measures to Prevent the Collapse of L-Shaped Retaining Walls\" width=\"600\" height=\"400\" \/><\/p>\n<p>The installation method varies depending on whether the space is small or large, and the cost of installation also varies accordingly.<\/p>\n<p>&nbsp;<\/p>\n<p>The narrower the space, the lower the work efficiency, so the cost will increase.<\/p>\n<p>If machinery can be used, work efficiency will improve, and construction costs are likely to decrease.<\/p>\n<p>&nbsp;<\/p>\n<p>Also, since I have to go onto my neighbor\u2019s property, if I happen to be in a dispute with them, it could lead to some awkward back-and-forth\u2026 lol<\/p>\n<p>I guess the client will just have to work that out.<\/p>\n<p>&nbsp;<\/p>\n<p>All retaining walls are basically the same!<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">Reinforcement Bar Insertion Work + Drainage Boring Work<\/span><\/strong><\/span><\/p>\n<p>This allows for stronger reinforcement than previous retaining walls.<\/p>\n<p>Even if the deterioration has progressed to a certain extent, there are still many things that can be done.<\/p>\n<p>&nbsp;<\/p>\n<p>One thing I want you to be careful about is,<\/p>\n<p>A contractor I consulted with said, \u201cThe only option is to start over.\u201d<\/p>\n<p>Not a public works contractor, but a contractor that can't perform design calculations.<\/p>\n<p>Contractors who try to cover it up with concrete lol<\/p>\n<p>Why shouldn't you cover it up with concrete?! Because once you do, it's impossible to assess the situation, no matter what happens afterward.<\/p>\n<p>Please be very careful of businesses on YouTube that claim to be experts.<\/p>\n<p>&nbsp;<\/p>\n<p>That said, I'm no expert on retaining walls either, but,<\/p>\n<p>In public works projects, we routinely handle measures to prevent retaining wall collapses and minor collapses of this magnitude as part of our regular work.<\/p>\n<p>I think a slope and a retaining wall are the same thing, so they must be the same.<\/p>\n<p>From a slope contractor's perspective, this shouldn't be a big deal!<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-56303\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/10\/391a5b7be6d3c4f36f66f28466d25fc7.png\" alt=\"Measures to Prevent the Collapse of Pile-Supported Retaining Walls\" width=\"600\" height=\"400\" \/><\/p>\n<p>If you have space in your yard, driving piles into the ground can help reduce the earth pressure on the retaining wall.<\/p>\n<p>The pile sizes range from approximately \u03c665 to \u03c6135, similar to those used in rebar insertion work.<\/p>\n<p>While using thicker rebar allows for longer placement intervals, there are pros and cons in terms of cost.<\/p>\n<p>This construction plan is based on the assumption that the machinery can be positioned on the garden side.<\/p>\n<p>The pile should be driven as deep as possible into the natural ground (solid soil) to distribute the earth pressure.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-56304\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/10\/532a2a2d12bdd9f7d9c924804056a64f.png\" alt=\"Piles for Preventing the Collapse of L-Shaped Retaining Walls\" width=\"600\" height=\"400\" \/><\/p>\n<p>It would be even better if there were a drain!<\/p>\n<p>Drive the piles while weaving between them.<\/p>\n<p><span style=\"font-size: 20px;\"><strong><span style=\"color: #ff0000;\">Secure it with piles and contain it by draining the water.<\/span><\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>This drainage boring method is essentially one of the measures used to prevent landslides, and we typically drill drainage holes 50 meters or 100 meters deep into mountains.<\/p>\n<p>Drain the water that causes landslides!<\/p>\n<p>This is the absolute basics.<\/p>\n<p>It really drives home the point that proper drainage is essential even for residential retaining wall reinforcement like this, doesn't it?<\/p>\n<p>&nbsp;<\/p>\n<p>I don't think the general public really understands this, but our job as slope engineers is to prevent landslides.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-41457\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2020\/03\/cd50031ed72f8ede634ad76e44965b71.jpg\" alt=\"Legal Framework Anchor\" width=\"600\" height=\"294\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2020\/03\/cd50031ed72f8ede634ad76e44965b71.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2020\/03\/cd50031ed72f8ede634ad76e44965b71-300x147.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>This job involves stabilizing cliffs and slopes like the one in the photo.<\/p>\n<p>It's not that difficult\u2014we're just applying the same principle to residential retaining walls.<\/p>\n<p>However, please be careful\u2014if you don\u2019t follow proper design principles and approach the construction with the right mindset, things could go terribly wrong.<\/p>\n<p>Design calculations are required! (Especially when obtaining a development permit.)<\/p>\n<p>&nbsp;<\/p>\n<p>Next time, I plan to write about costs and the minimum width for construction.<\/p>\n<p>&nbsp;<\/p>\n<p>See you later.<\/p>\n<p>P.S.<\/p>\n<p>It seems it's been featured on Google News for the past few days, and,<\/p>\n<p>Since many non-experts are reading this as well, I\u2019ve written it in a way that\u2019s easy for everyone to understand, rather than using overly technical language.<\/p>\n<p>Many of this blog\u2019s regular readers are slope engineering professionals, so I hope you\u2019ll keep an eye on this post, as there\u2019s a possibility that projects like this will come up in the future.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hello, everyone. This is Enta. To those who have registered as free users: A confirmation email will definitely be sent to the email address you provided! You must click the link in the confirmation email to complete your registration! 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