{"id":19507,"date":"2025-11-18T13:21:13","date_gmt":"2025-11-18T12:21:13","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19507"},"modified":"2026-05-01T11:23:02","modified_gmt":"2026-05-01T09:23:02","slug":"tunnel-face","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/tunnel-face","title":{"rendered":"Tunnel face"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>The <em>tunnel face<\/em> &#8211; also called the advance face &#8211; denotes the active extraction front in tunnel or adit construction. This is where geology meets engineering: rock, loose ground, or existing concrete linings are removed in a controlled manner, secured, and hauled away. At this focal point, excavation methods, support measures, and tool technology interlock. Depending on the task, <strong>rock wedge splitter and concrete splitter<\/strong>, <strong>concrete demolition shears<\/strong>, hydraulic power packs, rock splitting cylinders, combination and steel shears, or multi-cutters are used &#8211; especially for rock excavation and tunnel construction, concrete demolition and special demolition, as well as for special operations with sensitive boundary conditions.<\/p>\n<h2>Definition: What is meant by the tunnel face?<\/h2>\n<p>The tunnel face is the free, immediately worked surface at the end of an underground void where the next round is excavated. It bounds the tunnel or adit in the direction of advance and is subject to high structural and geotechnical demand. Depending on the rock mass, groundwater, and excavation method, the tunnel face governs stability, work sequence, and support. The configuration of the tunnel face includes top heading, bench, and invert; for partial-face excavation also crown and steps; in existing structures, additionally the concrete and steel components of the lining, which are often selectively dismantled using <strong>concrete demolition shears<\/strong> or steel shears.<\/p>\n<ul>\n<li><strong>Typical subdivisions<\/strong>: top heading, bench, invert, crown, and steps in partial-face advance<\/li>\n<li><strong>Existing structures<\/strong>: cast-in-place linings and precast segments with concrete and steel elements<\/li>\n<li><strong>Primary objectives<\/strong>: geometric accuracy, face stability, and efficient support installation<\/li>\n<\/ul>\n<h2>Structure and geometry of the tunnel face<\/h2>\n<p>The geometry of the tunnel face is determined by tunnel cross-section, excavation method, and rock mass behavior. Convex faces favor load transfer, while planar faces facilitate drilling. With partial-face excavation, top heading and bench are time-staggered, resulting in different support effects. Pipe umbrellas, spiles, or anchors engage in the face and provide pre-support. In existing structures, a distinction is made between cast-in-place concrete linings and segments; their location influences removal: localized release using splitting techniques yields controlled fracture patterns, while <strong>concrete demolition shears<\/strong> reprofile edges and expose reinforcement.<\/p>\n<ul>\n<li><strong>Design intent<\/strong>: limit overbreak and underbreak while enabling rapid support<\/li>\n<li><strong>Interface management<\/strong>: accurate transitions to pre-support and temporary linings<\/li>\n<li><strong>Drilling efficiency<\/strong>: planar areas for patterns, controlled relief cuts near sensitive zones<\/li>\n<\/ul>\n<h2>Geotechnical fundamentals and stability of the tunnel face<\/h2>\n<p>The stability of the tunnel face depends on strength, stratification, jointing systems, in-situ stress state, and water inflow. Decisive is the stand-up time until support installation. Classification systems (e.g., RMR, Q, or GSI) support the choice of measures but do not replace on-site observation. The goal is controlled load redistribution with minimal overbreak or underbreak.<\/p>\n<ul>\n<li><strong>Frequent failure modes<\/strong>: local wedge failures, chimneying, face bulging, squeezing, blowouts, and piping<\/li>\n<li><strong>Key controls<\/strong>: confinement at the face, timely shotcrete, and targeted pre-injection<\/li>\n<li><strong>Monitoring<\/strong>: convergence, face displacement pins, and inflow rates for adaptive design<\/li>\n<\/ul>\n<h3>Influence of rock mass and groundwater<\/h3>\n<p>Weak layers, fault zones, and anisotropic rocks promote detachment. High overburden increases the stress gradient, which can lead to squeezing or blowouts. Groundwater reduces effective stress, can cause washouts, and requires sealing or pre-injection. In loose ground, face support by pre-support and timely shotcrete application is crucial. Where permeability is high, staged probing, packer tests, and grouting reduce risks and improve stand-up time.<\/p>\n<h3>Support measures at the tunnel face<\/h3>\n<p>Typical measures include shotcrete (optionally fiber-reinforced), lattice girders, anchors, spiles, pipe umbrellas, injection methods, and temporary drift supports. Edges at the lining are neatly finished so as not to disturb load paths. For concrete components, low-vibration use of <strong>concrete demolition shears<\/strong> and steel shears has proven effective; in rock, <strong>rock wedge splitter and concrete splitter<\/strong> deliver controlled breaks with minimal edge damage.<\/p>\n<ul>\n<li><strong>Selection logic<\/strong>: adapt support stiffness and timing to stand-up time and groundwater<\/li>\n<li><strong>Constructability<\/strong>: ensure drilling access, hose routing, and safe sequencing<\/li>\n<li><strong>Quality<\/strong>: maintain consistent thickness and coverage of initial shotcrete shells<\/li>\n<\/ul>\n<h2>Excavation methods at the tunnel face<\/h2>\n<p>The choice of method depends on geology, cross-section, environmental requirements, and accessibility. Common are conventional drill-and-blast (blasting works), mechanical excavation (roadheaders, excavators), or full-face excavation with a tunnel boring machine. In addition, splitting techniques and hydraulic shears are used &#8211; particularly where boundary conditions are sensitive.<\/p>\n<ul>\n<li><strong>Decision criteria<\/strong>: rock mass rating, UCS, vibration limits, settlement tolerance, and access constraints<\/li>\n<li><strong>Profile accuracy<\/strong>: controlled techniques near interfaces, niches, and openings<\/li>\n<li><strong>Emission control<\/strong>: preference for low-vibration, low-noise options in constrained environments<\/li>\n<\/ul>\n<h3>Conventional drill-and-blast<\/h3>\n<p>Boreholes are drilled according to a pattern, charged, and blasted. Ventilation, support, and mucking follow. In areas with vibration limits or near existing structures, blast energy can be reduced and supplemented by splitting techniques. Scaling and edge finishing are often carried out hydraulically to improve profile accuracy and surface quality. Continuous monitoring of overbreak and blast-induced damage informs subsequent patterns and charges.<\/p>\n<h3>Mechanical excavation and cutting<\/h3>\n<p>Roadheaders and attachment tools remove rock continuously. In fit-out or refurbishment, concrete parts, protrusions, or embedded items must be removed precisely. <strong>concrete demolition shears<\/strong> and multi-cutters enable targeted removal of concrete edges without unnecessary shock input. Steel shears are used on sheet pile wall elements, beams, or formwork components encountered during advance. Tool choice is aligned with compressive strength, abrasivity, and reinforcement density to balance advance rate and durability.<\/p>\n<h3>Low-vibration excavation with splitting techniques<\/h3>\n<p><strong><a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">hydraulic rock and concrete splitters<\/a><\/strong> as well as <strong>hydraulic wedge splitter<\/strong> transmit hydraulically generated forces via wedges into predrilled holes, utilizing the wedge principle. Crack propagation proceeds in a controlled manner along the desired lines. Advantages include low vibration levels, minimal secondary damage, and good dimensional accuracy &#8211; a plus in urban tunnels, near heritage structures, or in geologically sensitive zones. A <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">hydraulic power pack<\/a> reliably supplies the cylinders even in confined conditions.<\/p>\n<h2>Applications: tunnel face in rock and tunnel construction<\/h2>\n<p>Whether a new line in mountainous terrain, an urban utility tunnel, or the rehabilitation of an existing adit: the tunnel face demands material- and method-appropriate work. Tools and support are coordinated to balance stability, profile accuracy, and construction time. Interfaces to existing structures, crossings, and planned openings require particularly careful sequencing and documentation.<\/p>\n<h3>Urban\/near-city tunneling projects<\/h3>\n<p>Strict requirements on noise and vibration favor mechanical methods and splitting techniques (<a href=\"https:\/\/www.darda.de\/en\/product-overview\/rock-splitters\">Rock Splitters<\/a>). <strong>rock wedge splitter and concrete splitter<\/strong> reduce harmful effects on adjacent buildings. <strong>concrete demolition shears<\/strong> take over precise reprofiling of concrete or shotcrete areas, such as at niches, inserts, and cross passages. Compliance with limit values for peak particle velocity, air overpressure, and noise is achieved through method choice and real-time monitoring.<\/p>\n<h3>Underpinning, cross passages, and enlargements<\/h3>\n<p>When opening cross passages or enlarging cross-sections, controlled cut edges are required. Splitting cylinders create predetermined fracture lines, concrete demolition shears remove residual fins and expose reinforcement. Steel shears cut profiles, rails, or temporary support frames. Staged advance with immediate support reduces deformation and risk at interfaces.<\/p>\n<h3>Rehabilitation and deconstruction in existing structures<\/h3>\n<p>When renewing internal linings, joint elements, or support structures at the face, the combination of splitting and shear techniques enables low-vibration deconstruction. This is particularly relevant in special demolition and building gutting, when operational influences or adjacent infrastructure must be considered. Selective removal preserves undamaged components and facilitates high-quality bonding surfaces for new linings.<\/p>\n<h2>Planning and occupational safety at the tunnel face<\/h2>\n<p>A systematic plan defines excavation steps, support cycles, instrumentation, and logistics. Safety concepts consider geohazards, compressive and shear stresses, water inflows, and the handling of hydraulic systems. All information must be verified for the specific project and does not replace a detailed hazard assessment. Permit conditions, monitoring thresholds, and contingency measures are integrated into the construction sequence.<\/p>\n<h3>Process organization and logistics<\/h3>\n<p>Short cycle times require reliable power supply and material flows. Hydraulic power packs are positioned so that hose runs are short and protected. Tools for removal, downsizing, and profile finishing are kept ready directly at the tunnel face to avoid waiting times. Clear staging of drilling, mucking, support installation, and survey improves throughput and reduces conflicts.<\/p>\n<ul>\n<li><strong>Staging<\/strong>: defined bays for explosives, tools, and consumables with protected access routes<\/li>\n<li><strong>Mucking<\/strong>: coordinated traffic management, dust suppression, and loading points<\/li>\n<li><strong>Redundancy<\/strong>: backup hydraulic units and spare hoses to limit downtime<\/li>\n<\/ul>\n<h3>Occupational safety and health protection<\/h3>\n<p>Personal protective equipment, safe setup of units, hose management, and exclusion zones are mandatory. Accumulator and hydraulic components are depressurized before changing tools. Dust suppression and noise reduction measures, sufficient ventilation, and clear communication pathways enhance the safety of all involved. Lockout-tagout for stored energy, emergency egress routes, and regular tool inspections are integral to safe operation.<\/p>\n<h2>Tool selection at the tunnel face: criteria and trade-offs<\/h2>\n<p>Selection is based on material, boundary conditions, and target quality. Decisive factors include strength, reinforcement ratio, water ingress, space constraints, and permissible emissions (vibration, noise emission, dust). Lifecycle considerations such as tool wear, maintenance access, and availability of power supply improve reliability and cost control.<\/p>\n<h3>Concrete at the tunnel face<\/h3>\n<p>For cast-in-place concrete, shotcrete, or segments, accurate edges and minimal spalling are important. <strong>concrete demolition shears<\/strong> enable controlled removal even in confined cross-sections. Steel shears cut reinforcement and profiles, multi-cutters handle versatile separation tasks. Splitting cylinders create predefined fracture edges that are then neatly finished. Sequencing avoids overstressing remaining elements and preserves bond for subsequent lining layers.<\/p>\n<h3>Rock at the tunnel face<\/h3>\n<p>In competent rocks, splitting techniques offer a low-vibration alternative or complement to impact tools. <strong>rock wedge splitter and concrete splitter<\/strong> and <strong>hydraulic wedge splitter<\/strong> improve profile accuracy, minimize overbreak, and facilitate support. In jointed rock, drilling patterns and wedge forces are adapted to joint orientations. Where anisotropy governs behavior, directional splitting along planes of weakness reduces energy demand and improves surface quality.<\/p>\n<h2>Quality control and documentation at the tunnel face<\/h2>\n<p>Documented are advance rate, profile accuracy, support condition, and measurements (settlements, convergences, water levels). Overbreak and underbreak are assessed and, if necessary, reworked &#8211; often with <strong>concrete demolition shears<\/strong> or shears to ensure lining quality. Tool and hydraulic parameters are recorded to guarantee reproducibility and traceability. Digital as-built models, photo logs, and inspection checklists support systematic review and handover.<\/p>\n<ul>\n<li><strong>Geometry control<\/strong>: total station and laser scans for profile compliance<\/li>\n<li><strong>Support verification<\/strong>: thickness checks, pull tests, and material certificates<\/li>\n<li><strong>Performance data<\/strong>: drilling meters, splitting pressures, and cycle times<\/li>\n<\/ul>\n<h2>Environmental aspects and emissions at the tunnel face<\/h2>\n<p>Vibration, noise, and dust are key influencing factors. Hydraulic splitting and shear techniques generally operate more quietly and cause fewer secondary damages than percussive methods. Proper water management, dust binding, and the right tool choice support environmentally responsible excavation. Closed-loop water circuits, efficient ventilation, and targeted source control reduce the environmental footprint of the advance.<\/p>\n<ul>\n<li><strong>Emission control<\/strong>: atomized water sprays, local extraction, and enclosure where feasible<\/li>\n<li><strong>Water stewardship<\/strong>: sedimentation, filtration, and controlled discharge<\/li>\n<li><strong>Energy efficiency<\/strong>: optimized duty cycles and right-sized hydraulic power packs<\/li>\n<\/ul>\n<h2>Practical sequence: typical work steps at the tunnel face<\/h2>\n<p>A structured sequence increases safety and efficiency.<\/p>\n<ol>\n<li>Expose and assess geology; secure water inflows.<\/li>\n<li>Install pre-support and temporary support (e.g., spiles, shotcrete).<\/li>\n<li>Drill according to pattern; adjust hole diameter and depth for splitting techniques.<\/li>\n<li>Excavation by blasting works, mechanical cutting, or hydraulic splitting.<\/li>\n<li>Reprofiling and downsizing: <strong>concrete demolition shears<\/strong>, steel shears, or multi-cutters for edges, reinforcement, and embedded items.<\/li>\n<li>Muck removal, cleaning, completion of support.<\/li>\n<li>Documentation, measurement, and preparation of the next cycle.<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The tunnel face &#8211; also called the advance face &#8211; denotes the active extraction front in tunnel or adit construction. This is where geology meets engineering: rock, loose ground, or existing concrete linings are removed in a controlled manner, secured, and hauled away. At this focal point, excavation methods, support <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/tunnel-face\">read more&#8230;<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"parent":14846,"menu_order":0,"comment_status":"open","ping_status":"open","template":"tmpl\/template-wissen.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-19507","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tunnel Face Definition in Underground Construction<\/title>\n<meta name=\"description\" content=\"Guide to the tunnel face in tunneling - excavation, stability, safety, support methods \u2713 and low vibration techniques.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.darda.de\/en\/knowledge\/tunnel-face\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tunnel Face Definition in Underground Construction\" \/>\n<meta property=\"og:description\" content=\"Guide to the tunnel face in tunneling - 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