{"id":7683,"date":"2025-10-21T13:46:31","date_gmt":"2025-10-21T13:46:31","guid":{"rendered":"https:\/\/geomatrix.co\/?p=7683"},"modified":"2025-10-21T13:46:31","modified_gmt":"2025-10-21T13:46:31","slug":"tanque-elevado-cajamarca-geomallas","status":"publish","type":"post","link":"https:\/\/geomatrix.co\/en\/tanque-elevado-cajamarca-geomallas\/","title":{"rendered":"Elevated tank in Cajamarca with Fortgrid BX geogrids"},"content":{"rendered":"<p data-start=\"979\" data-end=\"1310\">The <strong data-start=\"982\" data-end=\"1023\">Provincial Municipality of Cajamarca<\/strong>in alliance with <a href=\"https:\/\/www.sedacaj.com.pe\"><strong data-start=\"1040\" data-end=\"1051\">SEDACAJ<\/strong><\/a> and <strong data-start=\"1054\" data-end=\"1065\">Newmont<\/strong>has developed an important water infrastructure project on the outskirts of the city. This is a <strong data-start=\"1178\" data-end=\"1208\">1,100 m\u00b3 elevated tank<\/strong>located in the area of the <strong data-start=\"1233\" data-end=\"1247\">Qhapaq \u00d1an<\/strong>which supplies potable water to more than <strong data-start=\"1288\" data-end=\"1309\">20,000 inhabitants<\/strong>.<\/p>\n<p data-start=\"1312\" data-end=\"1522\">This project faced major geotechnical challenges, which were solved through the use of <strong data-start=\"1394\" data-end=\"1429\">Fortgrid BX biaxial geogrids<\/strong>a modern solution for foundations on clayey soils with low bearing capacity.<\/p>\n<p>Their main characteristics are summarized below:<\/p>\n<p><img alt=\"Tabla especificaciones t\u00e9cnicas represa Cajamarca Qhapaq Nan\" loading=\"lazy\" decoding=\"async\" class=\"wp-image-7684 aligncenter\" src=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/Captura-de-pantalla-2025-10-21-a-las-8.16.45%E2%80%AFa.m-300x183.png\" width=\"444\" height=\"271\" srcset=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/Captura-de-pantalla-2025-10-21-a-las-8.16.45%E2%80%AFa.m-300x183.png 300w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/Captura-de-pantalla-2025-10-21-a-las-8.16.45%E2%80%AFa.m-18x12.png 18w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/Captura-de-pantalla-2025-10-21-a-las-8.16.45%E2%80%AFa.m.png 716w\" sizes=\"auto, (max-width: 444px) 100vw, 444px\"><\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_7685\" style=\"width: 440px\" class=\"wp-caption aligncenter\"><img alt=\"Torre monumental con s\u00edmbolos ind\u00edgenas y multitud de visitantes\" loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-7685\" class=\"wp-image-7685\" title=\"Figure 1: Elevated tank of the Qhapaq \u00d1an tubular well in Cajamarca.\" src=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/5156262-300x188.jpg\" width=\"430\" height=\"269\" srcset=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/5156262-300x188.jpg 300w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/5156262-768x481.jpg 768w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/5156262-18x12.jpg 18w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/5156262.jpg 999w\" sizes=\"auto, (max-width: 430px) 100vw, 430px\"><p id=\"caption-attachment-7685\" class=\"wp-caption-text\">Figure 1: Elevated tank of the Qhapaq \u00d1an tubular well in Cajamarca.<\/p><\/div>\n<h2 data-start=\"1948\" data-end=\"1987\">Geotechnical problems in Cajamarca<\/h2>\n<p data-start=\"1989\" data-end=\"2245\">The area has <strong data-start=\"2006\" data-end=\"2035\">soft clayey soils<\/strong>classified as type CL, with low bearing capacity and high compressibility. These factors increase the risk of <strong data-start=\"2156\" data-end=\"2187\">differential settlements<\/strong>especially under heavy structures such as this tank.<\/p>\n<p data-start=\"2247\" data-end=\"2274\">The studies identified:<\/p>\n<ul data-start=\"2276\" data-end=\"2381\">\n<li data-start=\"2276\" data-end=\"2314\">\n<p data-start=\"2278\" data-end=\"2314\">Low friction angles (13-15\u00b0)<\/p>\n<\/li>\n<li data-start=\"2315\" data-end=\"2338\">\n<p data-start=\"2317\" data-end=\"2338\">High deformability<\/p>\n<\/li>\n<li data-start=\"2339\" data-end=\"2381\">\n<p data-start=\"2341\" data-end=\"2381\">Risk of instability during earthquakes<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2383\" data-end=\"2455\">Therefore, the design required <strong data-start=\"2412\" data-end=\"2454\">foundation soil reinforcement<\/strong>.<\/p>\n<p><strong>ENGINEERED FOUNDATIONS AND GEOTECHNICAL CHALLENGES<\/strong><\/p>\n<p>The designed foundation consists of a reinforced concrete caisson divided into four independent compartments (for stability monitoring). For the support, the natural soil was removed and replaced by seven layers of a sandy gravelly granular material interspersed with layers of high-strength biaxial geogrid, thus reducing the compressibility of the soil and increasing the bearing capacity. The lower foundation slab is 462 m\u00b2 and the upper slab is 400 m\u00b2. This system seeks to create a wide and stable base under the tank.<\/p>\n<h2 data-start=\"2462\" data-end=\"2505\">Applied solution: Fortgrid BX geogrids<\/h2>\n<p data-start=\"2507\" data-end=\"2660\">In order to mitigate the risks of the terrain, a system of <strong data-start=\"2569\" data-end=\"2604\">biaxial geogrids <a href=\"https:\/\/geomatrix.co\/en\/fortgrid-bx\/\">Fortgrid BX<\/a><\/strong> between layers of granular material. This system allows:<\/p>\n<h3 data-start=\"2662\" data-end=\"2701\">Main reinforcement mechanisms:<\/h3>\n<ol data-start=\"2703\" data-end=\"3059\">\n<li data-start=\"2703\" data-end=\"2832\">\n<p data-start=\"2706\" data-end=\"2832\"><strong data-start=\"2706\" data-end=\"2732\">Lateral entrapment:<\/strong> The gravel is anchored in the mesh openings, generating friction and resistance to displacement.<\/p>\n<\/li>\n<li data-start=\"2833\" data-end=\"2942\">\n<p data-start=\"2836\" data-end=\"2942\"><strong data-start=\"2836\" data-end=\"2859\">Membrane effect:<\/strong> the geogrid acts as a tensioned membrane that redistributes the vertical load.<\/p>\n<\/li>\n<li data-start=\"2943\" data-end=\"3059\">\n<p data-start=\"2946\" data-end=\"3059\"><strong data-start=\"2946\" data-end=\"2983\">Increased bearing capacity:<\/strong> the active support zone expands, decreasing the fault depth.<\/p>\n<\/li>\n<\/ol>\n<blockquote data-start=\"3061\" data-end=\"3174\">\n<p data-start=\"3063\" data-end=\"3174\">This solution works as a \"<strong data-start=\"3095\" data-end=\"3114\">snow shoe<\/strong>\"The load is distributed over a wider and firmer base.<\/p>\n<\/blockquote>\n<p><img alt=\"Obra de construcci\u00f3n con excavadora y trabajadores en geotextil\" loading=\"lazy\" decoding=\"async\" class=\"wp-image-7686 aligncenter\" src=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/98459562-300x225.jpg\" width=\"472\" height=\"354\" srcset=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/98459562-300x225.jpg 300w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/98459562-768x577.jpg 768w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/98459562-16x12.jpg 16w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/98459562.jpg 884w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\"><\/p>\n<p>Fortgrid Bx geogrids stabilize compressible soils by exerting several actions: confining granular particles and preventing their lateral displacement, transferring frictional loads at the soil-geogrid interface and acting as a tensioned membrane under load. These properties control settlement and increase the bearing capacity of the foundation, compensating for the poor quality of the natural bearing soil.<\/p>\n<p><img alt=\"Excavadora amarilla en obra de construcci\u00f3n con monta\u00f1as al fondo\" loading=\"lazy\" decoding=\"async\" class=\"wp-image-7687 aligncenter\" src=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/89456263-225x300.jpg\" width=\"394\" height=\"525\" srcset=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/89456263-225x300.jpg 225w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/89456263-768x1023.jpg 768w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/89456263-9x12.jpg 9w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/89456263.jpg 884w\" sizes=\"auto, (max-width: 394px) 100vw, 394px\"><\/p>\n<p>Geogrid reinforcement mechanisms<\/p>\n<p>The main reinforcement mechanisms generated by the geogrid are as follows <a href=\"https:\/\/geomatrix.co\/en\/fortgrid-bx\/\">FORTGRID BX<\/a> are:<\/p>\n<ul>\n<li>Lateral embedment of the backfill: The gravel particles are embedded in the openings of the geogrid, creating a mechanical interlock that resists horizontal displacement of the soil. This \"passive anchoring\" increases the stiffness of the soil-geogrid assembly. Additionally, the rough surface of the geogrid generates friction with the soil, transferring load to the geosynthetic. Both effects combined increase the shear strength of the granular backfill.<\/li>\n<li>Tensioned membrane effect: Under a vertical load the soil-geogrid system yields forming a downward curvature. The geogrid, due to its high tensile stiffness, is tensioned like a membrane and exerts an upward vertical support force. This phenomenon redistributes the loads towards the edges of the caisson, reducing the vertical deformations on the soft subgrade.<\/li>\n<li>Increased bearing capacity: Together, lateral reinforcement and the membrane effect cause the active failure zone to expand laterally and decrease in depth. This significantly increases the bearing capacity of the foundation-soil system. As a result, expected settlements are reduced, permanent deformation is reduced and the response to seismic loads is improved.<\/li>\n<\/ul>\n<p>These mechanisms allow the tank to be supported on originally unsuitable ground. FORTGRID BX geogrid functions analogously to a \"snow shoe\" that spreads the load over a wide granular base. This results in a more stable and secure base.<\/p>\n<p><img alt=\"Obra de construcci\u00f3n con excavaci\u00f3n y cimientos de hormig\u00f3n\" loading=\"lazy\" decoding=\"async\" class=\"wp-image-7688 aligncenter\" src=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/9545656-300x169.jpg\" width=\"445\" height=\"251\" srcset=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/9545656-300x169.jpg 300w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/9545656-768x433.jpg 768w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/9545656-18x10.jpg 18w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/9545656.jpg 884w\" sizes=\"auto, (max-width: 445px) 100vw, 445px\"><\/p>\n<p><strong>EXPECTED RESULTS<\/strong><\/p>\n<p>After the implementation of the geogrid reinforcement, a much more stable foundation and a significant reduction of differential settlements are expected. Field studies and simulations indicate that the reinforced soil will show less subsidence under load, thanks to the confinement provided by the mesh. In practice, the use of FORTGRID BX saves material: by increasing stiffness, thinner granular layers can be used, reducing backfill volume, transport and construction time. In addition, the geogrid guarantees long-term performance without excessive deformation (thanks to its low creep). In sum, the reinforced foundation is expected to effectively support the load of the elevated tank with increased durability and improved performance under future loading cycles.<\/p>\n<p><img alt=\"Monumento futurista con decoraciones ind\u00edgenas y multitud de visitantes\" loading=\"lazy\" decoding=\"async\" class=\"wp-image-7689 aligncenter\" src=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/545623-300x197.png\" width=\"453\" height=\"298\" srcset=\"https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/545623-300x197.png 300w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/545623-768x504.png 768w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/545623-18x12.png 18w, https:\/\/geomatrix.sfo2.cdn.digitaloceanspaces.com\/web\/545623.png 884w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\"><\/p>","protected":false},"excerpt":{"rendered":"<p>The Provincial Municipality of Cajamarca, in partnership with SEDACAJ and Newmont, has developed an important water infrastructure project on the outskirts of the city. This is an elevated tank of 1,100 m\u00b3, located in the Qhapaq \u00d1an area, which supplies drinking water to more than 20,000 inhabitants. This project faced major...<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"La Municipalidad de Cajamarca construy\u00f3 un tanque elevado de 1.100 m\u00b3 para abastecer a 20.000 personas. 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