{"id":5563,"date":"2026-05-13T07:26:07","date_gmt":"2026-05-13T07:26:07","guid":{"rendered":"https:\/\/eurohinca.com\/?p=5563"},"modified":"2026-05-13T07:26:59","modified_gmt":"2026-05-13T07:26:59","slug":"how-to-choose-between-open-shield-epb-and-hydroshield","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/como-se-elige-entre-escudo-abierto-epb-e-hidroescudo\/","title":{"rendered":"How do I choose between open shield, EPB and hydroshield?"},"content":{"rendered":"
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The choice between open shield, EPB and hydroshield<\/strong> depends mainly on the geology, the presence of water, face stability, ground pressure, granulometry, abrasiveness and the tolerances required by the project. There is no universal TBM: each excavation system responds best to specific ground conditions, safety and face control.<\/p>\n

In an initial phase, Eurohinca analyzes the available geotechnical and hydrogeological information to define whether the project can be implemented with open shield<\/a>, EPB closed shield TBM<\/a> o hydro shield<\/a>. This decision is part of the process of choice of tunnel boring machine<\/a> and conditions safety, precision, performance and risk control during execution.<\/p>\n

Main selection criteria<\/h3>\n

Open shield:<\/strong> is usually valued in stable soils, with low water presence and conditions where the face can be kept under control during excavation. It is a suitable option when the geology allows working with direct or semi-direct access to the face, provided that the risk of instability, water ingress or loss of material is compatible with the method.<\/p>\n

EPB -Earth Pressure Balance-:<\/strong> is used when it is necessary to balance ground pressure at the face, especially in cohesive soils or soils where the excavated material can be conditioned to maintain stability. The EPB tunnel boring machine<\/a> allows to control the excavation pressure and reduce the risk of subsidence, over-excavation or loss of face.<\/p>\n

Hydroshield:<\/strong> is considered when there are saturated soils, high permeability, significant presence of water or the need to stabilize the face by mud pressure. The hydro-shield for water-logged terrain<\/a> is especially relevant in crossings under rivers, coastal areas, outfalls, catchments or routes with high water table.<\/p>\n

Data needed to decide<\/h3>\n

To make the right choice between open shield, EPB and hydroshield it is necessary to study:<\/p>\n

Geology of the layout:<\/strong> type of soil or rock, presence of boulders, mixed soils, fracturing, abrasiveness and geotechnical variability.<\/p>\n

Hydrogeological conditions:<\/strong> water table, permeability, water pressure, risk of water inflow and need for face control.<\/p>\n

Geometry of the work:<\/strong> diameter, length, depth, slope, radius of curvature and alignment tolerances.<\/p>\n

Environment crossed:<\/strong> roads, railroads, watercourses, buildings, existing services, urban areas or environmentally sensitive areas.<\/p>\n

Construction risks:<\/strong> subsidence, over-excavation, loss of stability, tool wear, head blockage, water ingress or deviations in routing.<\/p>\n

Logistics and auxiliary civil works:<\/strong> space available for vertical pits for driving and microtunneling<\/a>, The project includes the management of sludge or excavated material, accesses, stockpiles and auxiliary equipment.<\/p>\n

In practical terms, the open shield<\/strong> is associated with more stable and controllable terrain; the EPB<\/strong> is used when earth pressure equilibrium is required; and the hydro shield<\/strong> is selected when water, permeability or hydraulic pressure are determining factors. The final validation must be done with sufficient geotechnical information and a specific technical review of the layout.<\/p>\n

Minimum checklist for selecting the type of shield:<\/strong> geotechnical, water table, permeability, water pressure, diameter, length, depth, tolerances, infrastructure traversed, well spacing and site restrictions.<\/p>\n

Request a technical review to choose the most suitable tunnel boring machine<\/a> according to the geology, the water table and the constraints of your project.<\/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":"

La elecci\u00f3n entre escudo abierto, EPB e hidroescudo depende principalmente de la geolog\u00eda, la presencia de agua, la estabilidad del frente, la presi\u00f3n del terreno, la granulometr\u00eda, la abrasividad y las tolerancias exigidas por el proyecto. No existe una tuneladora universal: cada sistema de excavaci\u00f3n responde mejor a unas condiciones concretas de terreno, seguridad y […]<\/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-5563","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"\nEscudo abierto, EPB o hidroescudo | Eurohinca<\/title>\n<meta name=\"description\" content=\"Conozca c\u00f3mo elegir entre escudo abierto, EPB e hidroescudo seg\u00fan geolog\u00eda, agua, presi\u00f3n del frente y riesgos de obra SIN zanja.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eurohinca.com\/en\/how-to-choose-between-open-shield-epb-and-hydroshield\/\" \/>\n<meta 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