{"id":55794,"date":"2025-09-29T23:00:03","date_gmt":"2025-09-29T14:00:03","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/%e6%b3%95%e9%9d%a2%e5%b1%8b%e3%81%af%e7%9f%a5%e3%81%a3%e3%81%a6%e3%81%84%e3%81%a6%e6%ac%b2%e3%81%97%e3%81%84%e3%80%81%e7%8f%be%e5%a0%b4%e3%81%a7%e3%82%88%e3%81%8f%e4%bd%bf%e3%81%86%e7%b2%98%e7%9d%80-3\/"},"modified":"2026-05-16T17:05:20","modified_gmt":"2026-05-16T08:05:20","slug":"kohesi-phi-3","status":"publish","type":"post","link":"https:\/\/norimen.net\/id\/cohesion-phi-3\/","title":{"rendered":"Hal yang Harus Diketahui oleh Ahli Lereng: Pembahasan tentang Gaya Adhesi c dan Sudut Gesekan Internal \u03c6 yang Sering Digunakan di Lapangan (Bagian 3)"},"content":{"rendered":"<p>Halo semuanya.<\/p>\n<p>Ini Enta.<\/p>\n<p><a title=\"Hal yang Harus Diketahui oleh Para Ahli Lereng: Pembahasan tentang Gaya Adhesi c dan Sudut Gesekan Internal \u03c6 yang Sering Digunakan di Lapangan (Bagian 1)\" href=\"https:\/\/norimen.net\/id\/kohesi-phi-1\/\" target=\"_blank\" rel=\"noopener\">Hal yang Harus Diketahui oleh Para Ahli Lereng: Pembahasan tentang Gaya Adhesi c dan Sudut Gesekan Internal \u03c6 yang Sering Digunakan di Lapangan (Bagian 1)<\/a><\/p>\n<p><a title=\"Hal yang Harus Diketahui oleh Para Ahli Lereng: Pembahasan tentang Gaya Adhesi c dan Sudut Gesekan Internal \u03c6 yang Sering Digunakan di Lapangan (Bagian 1)\" href=\"https:\/\/norimen.net\/id\/kohesi-phi-1\/\" target=\"_blank\" rel=\"noopener\">Hal yang Harus Diketahui oleh Para Ahli Lereng: Pembahasan tentang Gaya Adhesi c dan Sudut Gesekan Internal \u03c6 yang Sering Digunakan di Lapangan (Bagian 1)<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-55509\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/09\/4d6e1912684e7edf660e5f589c892258-2.jpg\" alt=\"Sudut gesekan internal \u03c6 dan gaya adhesi C\" width=\"500\" height=\"500\" \/><\/p>\n<p>Pada artikel sebelumnya, saya menulis tentang kekuatan tanah.<\/p>\n<p>&nbsp;<\/p>\n<p>Nah, kali ini<span id=\"toc2\">Kita akan membahas lebih dalam mengenai daya rekat c (kN\/m\u00b2).<\/span><\/p>\n<h2>Definisi daya rekat<\/h2>\n<p>Kohesi (cohesion, simbol: c) adalah besaran yang menggambarkan secara numerik gaya yang menyebabkan butiran tanah saling menempel satu sama lain.<\/p>\n<p>Satuan ini dinyatakan dalam kN\/m\u00b2 dan merupakan indikator yang sangat penting dalam mengevaluasi karakteristik kekuatan tanah.<\/p>\n<p>Semakin besar \u201cdaya rekat\u201d ini, semakin sulit lereng atau permukaan galian runtuh; sebaliknya, jika dayanya kecil, tanah dan sedimen tidak dapat berdiri sendiri sehingga mudah runtuh.<\/p>\n<p>&nbsp;<\/p>\n<h3>Ilustrasi daya rekat<\/h3>\n<p>Tanah berpasir (pasir kering) \u2192 Daya rekat \u2252 0, teksturnya halus dan mudah hancur.<\/p>\n<p>Tanah viskos (bertekstur liat) \u2192 Memiliki daya rekat yang tinggi, sehingga dindingnya mudah berdiri sendiri.<\/p>\n<p>&nbsp;<\/p>\n<p>Misalnya, saat membuat \u201cbola pasir\u201d di kotak pasir, pasir yang kering tidak akan mempertahankan bentuknya, tetapi pasir yang mengandung air atau tanah liat akan mengeras.<\/p>\n<p>Jadi, \u201csifat mengeras\u201d inilah yang disebut daya rekat, ya.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-55601\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/09\/cc634649826a11b81863d7a2a521592c-1.jpg\" alt=\"Bola pasir\" width=\"600\" height=\"399\" \/><\/p>\n<h3>Arti angka-angka tersebut<\/h3>\n<p>Misalnya, jika c = 20 kN\/m\u00b2,<\/p>\n<p>Hal ini berarti tanah tersebut ditahan agar tidak longsor dengan gaya sebesar 20 kN (sekitar 2 ton) per 1 m\u00b2 luas penampang geser.<\/p>\n<p>&nbsp;<\/p>\n<p>Sebagai gambaran konkret, jika kita mempertimbangkan penampang geser seluas 1 m\u00b2,<\/p>\n<p>Struktur ini memiliki \u201ckekuatan tambahan\u201d yang memungkinkannya menahan beban sebesar 20 kN \u2252 2.000 kgf (sekitar 2 ton) tanpa runtuh.<\/p>\n<p>Kekuatan ini muncul sebagai \u2019komponen adhesi\u201c yang tetap ada meskipun \u201dtegangan efektif (\u03c3\u2019)\u201d dan \u201csudut gesekan (\u03c6)\u201d bernilai nol.<\/p>\n<p>&nbsp;<\/p>\n<p>Rumus kekuatan geser:<strong><span style=\"font-size: 150%;\">=+\u03c3\u2032\u22c5tan<\/span><\/strong><\/p>\n<p>Di sini, meskipun \u03c3\u2019 = 0, \u03c4 = c, sehingga timbul gaya tahan sebesar 20 kN\/m\u00b2.<\/p>\n<p>&nbsp;<\/p>\n<p>Secara desain, berdasarkan kriteria kegagalan Coulomb-Moll,<\/p>\n<p>Kekuatan geser \u03c4 = c + \u03c3\u2019\u30fbtan\u03c6 (di mana \u03c3\u2019: tegangan efektif, \u03c6: sudut gesekan internal) dievaluasi, dan c diperlakukan sebagai \u201ckomponen adhesi konstan\u201d di dalamnya.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-55522\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2025\/09\/12cfd044c5d61fe14475b3e4a6a3d5f9-2.png\" alt=\"Uji Penghancuran Klon\" width=\"600\" height=\"400\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Mengapa hal ini penting?<\/p>\n<p>&nbsp;<\/p>\n<p>Perhitungan stabilitas lereng: Semakin besar gaya adhesi, semakin tinggi tingkat stabilitasnya.<\/p>\n<p>Kelayakan pengeboran: Diperlukan untuk memperkirakan waktu mandiri.<\/p>\n<p>Desain tanah dasar: Sangat penting untuk penilaian daya dukung dan kegagalan geser.<\/p>\n<p>Secara khusus, di lapangan, menentukan apakah tanah tersebut merupakan tanah berpasir dengan daya rekat mendekati nol atau tanah liat dengan daya rekat yang tinggi merupakan hal penting pada tahap konstruksi.<\/p>\n<p>&nbsp;<\/p>\n<p>Gaya adhesi c [kN\/m\u00b2] = Gaya rekat yang dimiliki tanah.<\/p>\n<p>Pada tanah berpasir nilainya hampir nol, sedangkan pada tanah liat nilainya besar.<\/p>\n<p>Dalam rumus matematika, konstanta dalam \u201cRumus Mole-Coulomb\u201d.<\/p>\n<p>Hal ini merupakan persyaratan wajib dalam perhitungan stabilitas lereng.<\/p>\n<p>&nbsp;<\/p>\n<p>Selain itu, sebagai seorang insinyur, hal yang perlu diperhatikan adalah bahwa nilai c dapat berubah secara signifikan tergantung pada jenis tanah dan kadar airnya.<\/p>\n<p>Itulah sebabnya kita mengerti betapa pentingnya menguras air, bukan?<\/p>\n<p>&nbsp;<\/p>\n<p>Sampai jumpa lagi.<\/p>","protected":false},"excerpt":{"rendered":"<p>Halo semuanya. Ini Enta. Hal yang Harus Diketahui oleh Para Ahli Lereng: Pembahasan tentang Gaya Adhesi c dan Sudut Gesekan Internal \u03c6 yang Sering Digunakan di Lapangan (Bagian 1) Hal yang Harus Diketahui oleh Para Ahli Lereng: Pembahasan tentang Gaya Adhesi c dan Sudut Gesekan Internal \u03c6 yang Sering Digunakan di Lapangan (Bagian 1) Pada artikel sebelumnya, saya menulis tentang kekuatan tanah.  \u2026<\/p>","protected":false},"author":2,"featured_media":55791,"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":[34,38],"tags":[2095,6989,6990,7013,7014,7015],"class_list":["post-55794","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-slope-work","category-construction-management","tag-2095","tag-6989","tag-6990","tag-c","tag-7014","tag-7015"],"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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