{"id":5822,"date":"2026-10-14T10:05:41","date_gmt":"2026-10-14T10:05:41","guid":{"rendered":"https:\/\/eurohinca.com\/?p=5822"},"modified":"2026-10-14T10:05:43","modified_gmt":"2026-10-14T10:05:43","slug":"how-is-the-breakout-or-underwater-exit-of-a-tunnel-boring-machine-carried-out-at-the-end-of-an-outfall","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/como-se-ejecuta-el-breakout-o-salida-submarina-de-una-tuneladora-al-finalizar-un-emisario\/","title":{"rendered":"How is the breakout\u2014or underwater exit\u2014of a tunnel boring machine carried out at the end of an outfall?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The <strong>underwater breakout<\/strong> The final phase of a tunnel boring machine\u2019s operation at the end of an outfall involves executing the controlled exit of the shield from the ground into the marine environment, while maintaining the stability of the cutting face and preventing sudden water ingress, soil loss, uncontrolled turbidity, or damage to the pipeline. This is a critical phase because the tunnel boring machine transitions from excavating in a confined environment to connecting with the seafloor, where water pressure, waves, currents, sediments, environmental permits, and marine operations all come into play.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In projects of <a href=\"https:\/\/eurohinca.com\/en\/submarine-emissaries\/\">submarine emissaries<\/a>, <a href=\"https:\/\/eurohinca.com\/en\/sea-water-catchments\/\">sea water catchments<\/a> o <a href=\"https:\/\/eurohinca.com\/en\/crossings-of-marine-protected-areas\/\">crossings of marine protected areas<\/a>, the underwater exit must be planned during the design phase, not addressed at the end of the driving process. The procedure depends on the depth, geotechnical conditions, pressure level, diameter, type of tunnel boring machine, lining above the crown, meteorological and oceanographic conditions, and the method of recovery or final connection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why the underwater breakout is a critical phase<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">During the breakout, the containment of the ground at the face gradually disappears. If the breakout is not properly controlled, it can lead to water inflow, instability, fine-grained material washout, increased turbidity, slurry loss, final deviations, or damage to the seabed.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Risk<\/th><th>What Might Happen<\/th><\/tr><\/thead><tbody><tr><td>Sudden influx of water<\/td><td>Flooding of the face, shaft, or tunnel if there is no hydraulic control<\/td><\/tr><tr><td>Loss of ground<\/td><td>Fine-grained material transport, voids, or local instability<\/td><\/tr><tr><td>Turbidity<\/td><td>Resuspension of sediments or discharge of sludge into the marine environment<\/td><\/tr><tr><td>Final deviation<\/td><td>Error in dimension or alignment of the outlet<\/td><\/tr><tr><td>Damage to the tunnel boring machine<\/td><td>Collisions, blockages, or uncontrolled exits<\/td><\/tr><tr><td>Environmental Impact<\/td><td>Failure to comply with permit conditions or marine monitoring requirements<\/td><\/tr><tr><td>Incident involving diving\/ROV<\/td><td>Risks related to visibility, currents, pressure, or moving equipment<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, the breakout is treated as a standalone trade, with a specific procedure, trading windows, and exit criteria.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Main Phases of Implementation<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Preliminary verification of the route and starting point<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before reaching the seabed, the tunnel boring machine\u2019s actual position is verified through guidance control, surveying, bathymetry, exit elevation, and comparison with the project alignment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The following are reviewed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Final exit elevation.<\/li>\n\n\n\n<li>Remaining coating on the tunnel boring machine.<\/li>\n\n\n\n<li>Floor Plan Layout.<\/li>\n\n\n\n<li>Final pending.<\/li>\n\n\n\n<li>Distance to the reception or connection point.<\/li>\n\n\n\n<li>Updated bathymetry.<\/li>\n\n\n\n<li>Seabed conditions.<\/li>\n\n\n\n<li>Interference with breakwaters, anchorages, pipelines, cables, or structures.<\/li>\n\n\n\n<li>Permissible tolerances for subsequent connection.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For outfalls and intake structures, final accuracy is important because it affects diffusers, intake structures, ballast, connections, bottom protection, and subsequent underwater operations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Preparing the seabed<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">According to the plan, it may be necessary to prepare the exit area before the breakout.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Actions may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Control bathymetry.<\/li>\n\n\n\n<li>Removal of obstacles.<\/li>\n\n\n\n<li>Dredging or localized cleaning.<\/li>\n\n\n\n<li>Installation of temporary protection.<\/li>\n\n\n\n<li>Marine signage.<\/li>\n\n\n\n<li>Work Zone Markings.<\/li>\n\n\n\n<li>Vessel Positioning.<\/li>\n\n\n\n<li>Inspection by divers or ROV.<\/li>\n\n\n\n<li>Installation of reception areas, if applicable.<\/li>\n\n\n\n<li>Environmental protection against turbidity or sediment.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In sensitive areas, the plan must be coordinated with environmental permits, seasonal restrictions, turbidity control, and marine habitat monitoring.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Pressure Control and Front Stability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The advance must be carried out while maintaining pressure appropriate for the ground conditions and the water column. In closed-shield tunnel boring machines, such as <a href=\"https:\/\/eurohinca.com\/en\/closed-shield-hydroshield\/\">hydro shield<\/a> o <a href=\"https:\/\/eurohinca.com\/en\/closed-shield-epb\/\">EPB<\/a>, the chamber pressure is monitored to prevent a loss of stability before opening out to the sea.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The following are reviewed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>External hydrostatic pressure.<\/li>\n\n\n\n<li>Frontal pressure.<\/li>\n\n\n\n<li>Water table and connection to the sea.<\/li>\n\n\n\n<li>Soil permeability.<\/li>\n\n\n\n<li>Risk of siphoning or fine-particle entrainment.<\/li>\n\n\n\n<li>Inflow or outflow rates.<\/li>\n\n\n\n<li>Sludge losses.<\/li>\n\n\n\n<li>Excavated volume versus projected volume.<\/li>\n\n\n\n<li>Potential turbidity.<\/li>\n\n\n\n<li>Soil response to reduced cover.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The goal is for the material to be removed gradually, without sudden depressurization or loss of control over the excavated material.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Final excavation and controlled opening<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The tunnel boring machine is advancing the final meters using conservative parameters. The speed is reduced if necessary, and pressure, torque, thrust, flow rates, excavated volume, slurry, and guidance are monitored.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">During this phase, the following are monitored:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Final Progress Report by Cycle.<\/li>\n\n\n\n<li>Cutting pair.<\/li>\n\n\n\n<li>Push.<\/li>\n\n\n\n<li>Frontal pressure.<\/li>\n\n\n\n<li>Sludge flow rate or extraction rate.<\/li>\n\n\n\n<li>Excavated volume.<\/li>\n\n\n\n<li>Returns.<\/li>\n\n\n\n<li>Turbidity at the outlet.<\/li>\n\n\n\n<li>Actual position of the shield.<\/li>\n\n\n\n<li>Communication with marine equipment.<\/li>\n\n\n\n<li>Safety requirements for divers or ROVs.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The outfall can be directed toward the natural seabed, toward a previously treated area, or toward a prepared underwater structure, depending on the outfall\u2019s design.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Coordination with divers, ROVs, and maritime resources<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The underwater breakout requires coordination between the tunneling team and the marine team.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The following may participate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Professional divers.<\/li>\n\n\n\n<li>Inspection ROV.<\/li>\n\n\n\n<li>Auxiliary vessels.<\/li>\n\n\n\n<li>Positioning equipment.<\/li>\n\n\n\n<li>Cranes or lifting equipment.<\/li>\n\n\n\n<li>Surface-to-bottom communication systems.<\/li>\n\n\n\n<li>Environmental staff.<\/li>\n\n\n\n<li>Construction Management and HSE.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The coordination team must determine who authorizes the final advance, how the exit is communicated, which areas are off-limits, when divers or ROVs may approach, and what to do if turbidity, slurry leakage, or unexpected ground movement occurs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Environmental Control Measures<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In an underwater breakout, environmental control is part of the execution procedure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The following can be applied:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turbidity monitoring.<\/li>\n\n\n\n<li>Visual inspection using divers or ROVs.<\/li>\n\n\n\n<li>Restrictions on work on environmental windows.<\/li>\n\n\n\n<li>Barriers or containment measures, if feasible.<\/li>\n\n\n\n<li>Control of slurry and excavation fluids.<\/li>\n\n\n\n<li>Management of Removed Sediments.<\/li>\n\n\n\n<li>Incident Log.<\/li>\n\n\n\n<li>Communication with environmental or maritime authorities.<\/li>\n\n\n\n<li>Protection of seagrass beds, sensitive seabeds, or protected areas.<\/li>\n\n\n\n<li>Restoration of the background if the project requires it.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">At <a href=\"https:\/\/eurohinca.com\/en\/crossings-of-marine-protected-areas\/\">crossings of marine protected areas<\/a>, these inspections are often decisive for permits, planning, and project approval.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is checked after departure?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Once the breakout is complete, the following is verified:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Final position of the tunnel boring machine or pipe.<\/li>\n\n\n\n<li>Elevation and alignment.<\/li>\n\n\n\n<li>Condition of the seafloor.<\/li>\n\n\n\n<li>Driving integrity.<\/li>\n\n\n\n<li>Watertightness.<\/li>\n\n\n\n<li>No visible damage.<\/li>\n\n\n\n<li>Level of turbidity or environmental impact.<\/li>\n\n\n\n<li>Need for substantive protection.<\/li>\n\n\n\n<li>Conditions for connection to an underwater section, diffuser, or intake structure.<\/li>\n\n\n\n<li>Removal or retrieval of the tunnel boring machine, if necessary.<\/li>\n\n\n\n<li>As-built documentation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If the outfall includes connections to diffusers, a prefabricated underwater section, an intake, or a discharge structure, the accuracy of the breakout determines the next phase of installation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Risks of a Poorly Planned Underwater Exit<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Inadequate planning can lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uncontrolled water inflow.<\/li>\n\n\n\n<li>Pressure drop across the orifice.<\/li>\n\n\n\n<li>Fine-particle drag.<\/li>\n\n\n\n<li>Settlements or depressions beneath the seafloor.<\/li>\n\n\n\n<li>Excessive turbidity.<\/li>\n\n\n\n<li>Discharge of sludge into the sea.<\/li>\n\n\n\n<li>Exit deviation.<\/li>\n\n\n\n<li>Damage to the cutting head or pipe.<\/li>\n\n\n\n<li>Difficulty connecting the outfall.<\/li>\n\n\n\n<li>Delays due to sea conditions.<\/li>\n\n\n\n<li>Environmental noncompliance.<\/li>\n\n\n\n<li>Risks to divers, ROVs, or vessels.<\/li>\n\n\n\n<li>Cost overruns due to underwater corrections.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, the breakout must be integrated with the geotechnical design, the marine plan, the HSE plan, environmental monitoring, and the subsea reception procedure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Information Needed to Review the Project<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When designing or reviewing the underwater breakout for a tunnel boring machine, it is advisable to provide the following information: outfall diameter, driving length, type of tunnel boring machine, exit depth, water column, bathymetry, seabed geotechnical conditions, cover above the key, pressure level, permeability, presence of sand, silt, gravel, rock, or boulders, plan and profile layout, exit tolerances, guidance method, face pressure, slurry system, connection point, planned subsea structure, wave and current conditions, weather window, environmental restrictions, sensitive habitats, marine permits, diving or ROV resources, turbidity plan, HSE procedures, and contingency plan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CTA:<\/strong> Request a <a href=\"https:\/\/eurohinca.com\/en\/request-offer\/\">Technical Review of the Subsea Breakout for Outfalls and Intakes<\/a> Before finalizing the route, the tunnel boring machine, environmental permits, maritime resources, or RFQ documentation.<\/p>","protected":false},"excerpt":{"rendered":"<p>El breakout submarino de una tuneladora al finalizar un emisario consiste en ejecutar la salida controlada del escudo desde el terreno hacia el medio marino, manteniendo la estabilidad del frente, evitando entrada brusca de agua, p\u00e9rdida de terreno, turbidez no controlada o da\u00f1os en la tuber\u00eda. Es una fase cr\u00edtica porque la tuneladora pasa de [&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-5822","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Breakout submarino de tuneladora<\/title>\n<meta name=\"description\" content=\"C\u00f3mo ejecutar el breakout submarino de una tuneladora en emisarios: presi\u00f3n, guiado, lodos, buceo, ROV, turbidez y RFQ.\" \/>\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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