{"id":4930,"date":"2025-12-10T09:02:52","date_gmt":"2025-12-10T09:02:52","guid":{"rendered":"https:\/\/eurohinca.com\/?p=4930"},"modified":"2026-03-12T11:48:43","modified_gmt":"2026-03-12T11:48:43","slug":"what-geotechnical-risks-are-most-common-in-microtunneling-and-how-to-mitigate-them-on-site","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/que-riesgos-geotecnicos-son-mas-habituales-en-microtunelacion-y-como-se-mitigan-en-obra\/","title":{"rendered":"What geotechnical risks are most common in microtunnelling and how are they mitigated on site?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"4930\" class=\"elementor elementor-4930\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d6327ef e-flex e-con-boxed e-con e-parent\" data-id=\"d6327ef\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d3dfe2 elementor-widget elementor-widget-text-editor\" data-id=\"0d3dfe2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"496\" data-end=\"1011\">Microtunneling is a highly controlled method, but its success depends on the correct evaluation and management of the <strong data-start=\"616\" data-end=\"639\">geotechnical risks<\/strong>, especially in urban environments, heterogeneous terrain or areas with a high water table. Typical risks can affect both the stability of the face and the behavior of the pipe during jacking. Eurohinca, with more than 120 km executed in trenchless technologies, addresses these risks under strict engineering, operation and QA\/QC procedures.<\/p><p data-start=\"1013\" data-end=\"1108\">The most frequent risks and on-site mitigation strategies are described below:<\/p><h2 data-start=\"1115\" data-end=\"1182\"><strong data-start=\"1118\" data-end=\"1180\">Terrain variability and sudden changes in lithology.<\/strong><\/h2><p data-start=\"1183\" data-end=\"1382\">Jumps between cohesive and granular soils, coarse gravels, boulders, or soil-rock transitions can lead to <strong data-start=\"1291\" data-end=\"1318\">loss of lift<\/strong>, The use of the system is not recommended for the following reasons: pressure decompensation or accelerated wear of the head.<\/p><p data-start=\"1384\" data-end=\"1401\"><strong data-start=\"1384\" data-end=\"1399\">Mitigation:<\/strong><\/p><ul data-start=\"1402\" data-end=\"1686\"><li data-start=\"1402\" data-end=\"1482\"><p data-start=\"1404\" data-end=\"1482\">Pre-selection of the shield type (<strong data-start=\"1441\" data-end=\"1462\">EPB or Hydroshield<\/strong>) according to geotechnics.<\/p><\/li><li data-start=\"1483\" data-end=\"1556\"><p data-start=\"1485\" data-end=\"1556\">Chamber pressure control to balance thrust and avoid voids.<\/p><\/li><li data-start=\"1557\" data-end=\"1620\"><p data-start=\"1559\" data-end=\"1620\">Automatic readjustment of cutting torque and feed speed.<\/p><\/li><li data-start=\"1621\" data-end=\"1686\"><p data-start=\"1623\" data-end=\"1686\">Continuous lubrication to reduce pipe overstress.<\/p><\/li><\/ul><p data-start=\"1688\" data-end=\"1933\">The importance of choosing the right method according to the terrain is explained in <strong data-start=\"1759\" data-end=\"1931\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/what-is-pipe-jacking-and-how-is-it-applied-in-subway-projects\/\" target=\"_new\" rel=\"noopener\" data-start=\"1761\" data-end=\"1929\">what is pipe jacking and how is it applied in subway projects?<\/a><\/strong>.<\/p><h2 data-start=\"1940\" data-end=\"1999\"><strong data-start=\"1943\" data-end=\"1997\">2. Water inflows and water table pressure.<\/strong><\/h2><p data-start=\"2000\" data-end=\"2109\">Water can cause erosion, face instability, fines entrainment and risk of surface settlement.<\/p><p data-start=\"2111\" data-end=\"2128\"><strong data-start=\"2111\" data-end=\"2126\">Mitigation:<\/strong><\/p><ul data-start=\"2129\" data-end=\"2413\"><li data-start=\"2129\" data-end=\"2198\"><p data-start=\"2131\" data-end=\"2198\">Precise adjustment of <strong data-start=\"2149\" data-end=\"2170\">chamber pressure<\/strong> to balance the front.<\/p><\/li><li data-start=\"2199\" data-end=\"2273\"><p data-start=\"2201\" data-end=\"2273\">Use of <strong data-start=\"2208\" data-end=\"2223\">Hydroshield<\/strong> with pressurized muds for saturated soils.<\/p><\/li><li data-start=\"2274\" data-end=\"2347\"><p data-start=\"2276\" data-end=\"2347\">Modification of the sludge or polymer mixture to improve rheology.<\/p><\/li><li data-start=\"2348\" data-end=\"2413\"><p data-start=\"2350\" data-end=\"2413\">Continuous monitoring of sludge consumption, pumping and return.<\/p><\/li><\/ul><p data-start=\"2415\" data-end=\"2662\">The article <strong data-start=\"2427\" data-end=\"2587\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/pressure-management-under-high-groundwater-with-hydroshields\/\" target=\"_new\" rel=\"noopener\" data-start=\"2429\" data-end=\"2585\">management of pressures under high groundwater with hydroshields<\/a><\/strong> describes the principles of front-end stability and hydraulic control.<\/p><h2 data-start=\"2669\" data-end=\"2734\"><strong data-start=\"2672\" data-end=\"2732\">3. Loss of lift and surface settlements<\/strong><\/h2><p data-start=\"2735\" data-end=\"2852\">In granular or poorly cohesive soils, excavation can generate voids, causing surface deformations.<\/p><p data-start=\"2854\" data-end=\"2871\"><strong data-start=\"2854\" data-end=\"2869\">Mitigation:<\/strong><\/p><ul data-start=\"2872\" data-end=\"3123\"><li data-start=\"2872\" data-end=\"2940\"><p data-start=\"2874\" data-end=\"2940\">Simultaneous control of face pressure, cutting torque and speed.<\/p><\/li><li data-start=\"2941\" data-end=\"3007\"><p data-start=\"2943\" data-end=\"3007\">Grout or bentonite injection to compensate voids.<\/p><\/li><li data-start=\"3008\" data-end=\"3073\"><p data-start=\"3010\" data-end=\"3073\">Topographic monitoring of the terrain with robotic stations.<\/p><\/li><li data-start=\"3074\" data-end=\"3123\"><p data-start=\"3076\" data-end=\"3123\">Continuous digital recording of feed rate and thrust.<\/p><\/li><\/ul><h2 data-start=\"3130\" data-end=\"3193\"><strong data-start=\"3133\" data-end=\"3191\">4. Increased torque and risk of pipe blockage.<\/strong><\/h2><p data-start=\"3194\" data-end=\"3293\">It may be due to excessive friction, lack of lubrication, demanding geometry or abrasive terrains.<\/p><p data-start=\"3295\" data-end=\"3312\"><strong data-start=\"3295\" data-end=\"3310\">Mitigation:<\/strong><\/p><ul data-start=\"3313\" data-end=\"3578\"><li data-start=\"3313\" data-end=\"3371\"><p data-start=\"3315\" data-end=\"3371\">Repeated lubrication of the conduit (slurry\/bentonite).<\/p><\/li><li data-start=\"3372\" data-end=\"3440\"><p data-start=\"3374\" data-end=\"3440\"><strong data-start=\"3374\" data-end=\"3410\">Intermediate thrust stations<\/strong> according to length and curvature.<\/p><\/li><li data-start=\"3441\" data-end=\"3506\"><p data-start=\"3443\" data-end=\"3506\">Alignment control to avoid accumulated deviations.<\/p><\/li><li data-start=\"3507\" data-end=\"3578\"><p data-start=\"3509\" data-end=\"3578\">Thermal management of the spindle and tool change if necessary.<\/p><\/li><\/ul><p data-start=\"3580\" data-end=\"3822\">In projects with curvature, the case <strong data-start=\"3616\" data-end=\"3714\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/works\/microtunnel-in-arenao-curve\/\" target=\"_new\" rel=\"noopener\" data-start=\"3618\" data-end=\"3712\">microtunnel in curve at El Arenao<\/a><\/strong> shows how thrust and lubrication management allows tolerances to be maintained without exceeding limit loads.<\/p><h2 data-start=\"3829\" data-end=\"3876\"><strong data-start=\"3832\" data-end=\"3874\">5. Internal erosion and fines entrainment.<\/strong><\/h2><p data-start=\"3877\" data-end=\"3966\">Loss of fines can compromise soil stability and lead to subsidence.<\/p><p data-start=\"3968\" data-end=\"3985\"><strong data-start=\"3968\" data-end=\"3983\">Mitigation:<\/strong><\/p><ul data-start=\"3986\" data-end=\"4149\"><li data-start=\"3986\" data-end=\"4031\"><p data-start=\"3988\" data-end=\"4031\">Adjustment of sludge viscosity and density.<\/p><\/li><li data-start=\"4032\" data-end=\"4085\"><p data-start=\"4034\" data-end=\"4085\">Monitoring of extracted vs. expected volume.<\/p><\/li><li data-start=\"4086\" data-end=\"4149\"><p data-start=\"4088\" data-end=\"4149\">Exhaustive control of permeability and hydraulic gradients.<\/p><\/li><\/ul><h2 data-start=\"4156\" data-end=\"4218\"><strong data-start=\"4159\" data-end=\"4216\">6. Risks due to the presence of nearby infrastructure<\/strong><\/h2><p data-start=\"4219\" data-end=\"4304\">The proximity of pipelines, foundations or utility networks requires maximum precision.<\/p><p data-start=\"4306\" data-end=\"4323\"><strong data-start=\"4306\" data-end=\"4321\">Mitigation:<\/strong><\/p><ul data-start=\"4324\" data-end=\"4494\"><li data-start=\"4324\" data-end=\"4381\"><p data-start=\"4326\" data-end=\"4381\">Layout with strict tolerances in plan and elevation.<\/p><\/li><li data-start=\"4382\" data-end=\"4441\"><p data-start=\"4384\" data-end=\"4441\">Laser\/gyro navigation with deviation alarms.<\/p><\/li><li data-start=\"4442\" data-end=\"4494\"><p data-start=\"4444\" data-end=\"4494\">Continuous validation of the as-built during driving.<\/p><\/li><\/ul><p data-start=\"4501\" data-end=\"4758\">In all phases, Eurohinca applies its own protocols of <strong data-start=\"4560\" data-end=\"4599\">monitoring, QA\/QC and HSE management<\/strong>, based on their experience with microtunnels and <strong data-start=\"4645\" data-end=\"4754\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/subway-terrestrial-applications\/\" target=\"_new\" rel=\"noopener\" data-start=\"4647\" data-end=\"4752\">subway and overland installations<\/a><\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>La microtunelaci\u00f3n es un m\u00e9todo altamente controlado, pero su \u00e9xito depende de una correcta evaluaci\u00f3n y gesti\u00f3n de los riesgos geot\u00e9cnicos, especialmente en entornos urbanos, terrenos heterog\u00e9neos o zonas con nivel fre\u00e1tico elevado. Los riesgos habituales pueden afectar tanto a la estabilidad del frente como al comportamiento de la tuber\u00eda durante la hinca. Eurohinca, con [&hellip;]<\/p>\n","protected":false},"author":80,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[146],"tags":[],"class_list":["post-4930","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Riesgos geot\u00e9cnicos en microtunelaci\u00f3n y mitigaci\u00f3n<\/title>\n<meta name=\"description\" content=\"Principales riesgos geot\u00e9cnicos en microtunelaci\u00f3n y c\u00f3mo se mitigan: estabilidad del frente, agua, asentamientos, torque y bloqueos.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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