{"id":20169,"date":"2026-01-27T15:27:21","date_gmt":"2026-01-27T14:27:21","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=20169"},"modified":"2026-06-17T16:40:03","modified_gmt":"2026-06-17T14:40:03","slug":"soft-rock-processing","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/soft-rock-processing","title":{"rendered":"Soft rock processing"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Soft rock processing covers the controlled loosening, shaping, and breaking down of naturally formed rocks of low to medium strength such as limestone, sandstone, marl, gypsum rock, tuff, or chalk. In construction, in <em>concrete demolition and special demolition<\/em>, in <em>natural stone extraction<\/em>, as well as in <em>rock excavation and tunnel construction<\/em>, methods with low vibration levels are required that work precisely and gently on the material. Central to this are hydraulic splitting and shear methods, for example the use of <strong><a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">hydraulic rock and concrete splitters<\/a><\/strong> for crack steering and-depending on the task-of <strong>concrete demolition shears<\/strong> for selective separation work on masonry, concrete, and natural-stone-like composites. The focus is on controlled crack initiation, minimal dust and noise, and reproducible results under spatial constraints.<\/p>\n<h2>Definition: What is meant by soft rock processing?<\/h2>\n<p>Soft rock processing encompasses all technical processes used to loosen, split, separate, or shape rocks of low to medium compressive strength (<em>typically<\/em> uniaxial compressive strength in the range of about 5-60 MPa, depending on petrography and moisture content). These include hydraulic splitting via boreholes, crushing with shears, precision cutting at edges, and controlled detachment along natural bedding or joint planes. The objective is reproducible crack guidance with minimal vibrations, noise, and dust generation. In practice, <strong>hydraulic splitters and concrete splitters<\/strong> are often powered by <em><a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">hydraulic power units<\/a><\/em>; <strong>concrete demolition shears<\/strong> are additionally used when components made of concrete or mixed construction materials with a soft rock share are selectively deconstructed or adjusted.<\/p>\n<ul>\n<li><strong>Core aims:<\/strong> low-vibration detachment, guided crack propagation, dimensional accuracy, and reduced rework.<\/li>\n<li><strong>Typical constraints:<\/strong> tight site conditions, protection of neighboring structures, emission limits for dust and noise.<\/li>\n<\/ul>\n<h2>Material groups and key properties of soft rock<\/h2>\n<p>Soft rock is heterogeneous. For planning, geological classification and mechanical properties are decisive: limestone (fine- to coarse-crystalline), sandstone (cemented, varying grain bonding), marl (clayey-calcareous), gypsum\/anhydrite, tuff, and chalk differ significantly in strength, abrasivity, moisture uptake, and bedding behavior. Relevant parameters are in particular uniaxial compressive strength, indirect tensile (Brazilian) strength, modulus of elasticity, natural jointing\/bedding, porosity, water content, and degree of weathering. For the work strategy it is important whether pronounced bedding planes favor crack propagation, whether zones with higher strength (e.g., siliceous layers) are present, and whether embedded items such as masonry anchor, reinforcement, or utility line occur. These factors determine borehole spacing, required splitting pressure, shear jaw opening, and the sequence of work steps.<\/p>\n<ul>\n<li><strong>Limestone:<\/strong> often well bedded; good crack steering along stratification, local hard layers possible.<\/li>\n<li><strong>Sandstone:<\/strong> bond and cement vary; higher abrasivity requires adapted tool maintenance.<\/li>\n<li><strong>Marl and chalk:<\/strong> higher moisture sensitivity; risk of smear on borehole walls, careful pressure ramping advisable.<\/li>\n<li><strong>Gypsum and anhydrite:<\/strong> prone to hydration effects; temperature and water management are critical.<\/li>\n<li><strong>Tuff:<\/strong> porous and lightweight; avoid excessive local loads to prevent uncontrolled spalling.<\/li>\n<\/ul>\n<h2>Methods and tools: splitting, shear work, and controlled separation<\/h2>\n<p>The choice of method depends on rock characteristics, target geometry, space constraints, and emission requirements. <strong>Hydraulic splitters and concrete splitters<\/strong> generate high radial forces via splitting wedges and reaction shoes in prepared boreholes and open defined cracks in the rock. They are particularly suitable for blockwise release in <em>rock excavation and tunnel construction<\/em> as well as for precise detachment of fa\u00e7ade or foundation areas during <em>building gutting and cutting<\/em>. <strong>Concrete demolition shears<\/strong> grip and crush components through high jaw forces; they are helpful when soft rock occurs in combination with concrete or masonry, for example in plinths, retaining walls, or infills. <em>Hydraulic power packs<\/em> supply both methods with the necessary pressure and flow rate. For special tasks, an <strong><a href=\"https:\/\/www.darda.de\/en\/product-overview\/steel-shears\">steel shears<\/a><\/strong> can additionally be used for metal parts when the soft rock is coupled with technical installations.<\/p>\n<ul>\n<li><strong>Advantages at a glance:<\/strong> precise crack initiation, low vibration and noise, reduced dust with suitable suppression, and high repeatability.<\/li>\n<\/ul>\n<h3>Hydraulic power packs and energy supply<\/h3>\n<p>For consistent splitting and shear performance, a stable system pressure, sufficient flow rate, and thermal reserves of the unit are essential. Pressure and temperature monitoring, clean hydraulic fluid, and suitable hose cross-sections ensure repeatable crack formation, especially in moist or clayey rock that tends to \u201clubricate.\u201d Sufficient duty cycle reserves and ambient temperature management prevent output drop and protect seals.<\/p>\n<h3>Borehole geometry and splitting strategy<\/h3>\n<p>Borehole diameter and depth must match the splitter. Hole spacing is based on strength, jointing, and desired block size: a denser grid for more homogeneous, firmly bonded sandstones; larger spacing for pronounced bedding. Starting at free edges, splitting is performed in sequences to steer crack propagation and avoid overbreak.<\/p>\n<ul>\n<li>Align <strong>borehole rows<\/strong> parallel to bedding where possible to favor guided cracks.<\/li>\n<li>Use <strong>progressive loading<\/strong> with short holding phases for uniform energy input.<\/li>\n<li>Keep <strong>edge offsets<\/strong> sufficient to avoid unplanned breakout at corners and openings.<\/li>\n<\/ul>\n<h3>Shear kinematics and edge work<\/h3>\n<p>When using <strong>concrete demolition shears<\/strong> on mixed masonry and weakly bonded natural stones, gripping position, application point, and feed are decisive. Intermittent work with brief holding pressures promotes controlled spalling and prevents unintended indentation into porous structures. Jaw shape and wear state influence bite behavior; regular inspection and timely replacement maintain clean separation lines.<\/p>\n<h2>Workflow and best practices<\/h2>\n<p>A structured workflow increases quality and efficiency: clarify the geological situation, define safety and emission targets, select the equipment combination, then proceed in a coordinated manner from drilling plan through splitting to edge finishing. A written method statement with measurable acceptance criteria and monitoring points supports reliable execution.<\/p>\n<ol>\n<li>Geological assessment and selection of method mix.<\/li>\n<li>Drilling plan, test drilling, and trial splitting to calibrate spacing and pressure.<\/li>\n<li>Execution in controlled sequences with ongoing documentation and emissions control.<\/li>\n<li>Edge finishing, handling, and interim quality checks.<\/li>\n<\/ol>\n<h3>Pre-investigation and documentation<\/h3>\n<p>Bedding, weathered zones, and moisture must be recorded. Core drilling or <strong>test drilling<\/strong> in critical areas provide indications of bonding and possible inclusions. Documenting strength indices and water inflows facilitates the selection of grid spacing and tools. Where appropriate, quick index tests (e.g., point-load index) and non-destructive sounding help to refine parameter selection.<\/p>\n<ul>\n<li>Record UCS indications, discontinuities, water ingress, and blockability with photos and coordinates.<\/li>\n<li>Map interfaces to adjacent structures and define monitoring points for vibration and displacement.<\/li>\n<\/ul>\n<h3>Pre-splitting, post-splitting, edge finishing<\/h3>\n<p>Pre-splitting creates relief joints and produces predictable fracture faces. Post-splitting reduces block sizes for transport or further processing. With <strong>concrete demolition shears<\/strong>, edges are straightened, openings are exposed, or composite stones are selectively released without unnecessarily weakening load-bearing areas.<\/p>\n<ul>\n<li><strong>Pre-splitting:<\/strong> targeted relief and crack guidance.<\/li>\n<li><strong>Post-splitting:<\/strong> size reduction adapted to handling and haulage.<\/li>\n<li><strong>Edge finishing:<\/strong> precise adjustment of interfaces and openings.<\/li>\n<\/ul>\n<h3>Handling and logistics<\/h3>\n<p>Transport route and lifting points should be planned early. Block sizes are aligned with lifting gear and haulage. In tunnel situations, cyclic work with small splitting sequences minimizes fine dust and noise loads. Material flow, interim storage, and separate disposal or reuse of stone, concrete, and metal fractions enhance site efficiency.<\/p>\n<h2>Application areas and typical scenarios<\/h2>\n<p>In <em>natural stone extraction<\/em>, splitting along natural bedding enables the recovery of dimensionally accurate raw blocks from limestone or sandstone. In <em>rock excavation and tunnel construction<\/em>, soft rock is released with low vibration levels at boundaries to protect neighboring structures and linings. In <em>concrete demolition and special demolition<\/em>, composites of concrete, masonry, and soft rock occur, for example with foundations on limestone beds; here, <strong>hydraulic splitters and concrete splitters<\/strong> support targeted opening, while <strong>concrete demolition shears<\/strong> selectively crush components. In <em>building gutting and cutting<\/em>, cutouts, chases, and openings in weakly bonded masonry areas are produced with precision. <em>Special demolition<\/em> includes work in sensitive environments such as heritage sites, hospitals, or industrial areas where vibrations, dust, and noise are strictly limited. Pre-splitting and real-time monitoring are advantageous near critical assets such as pipelines, galleries, or occupied buildings.<\/p>\n<h2>Quality requirements for fracture faces and dimensional accuracy<\/h2>\n<p>The quality of fracture faces influences material yield in <em>natural stone extraction<\/em> and connection capability in fit-out. Accurate edges result from sequential splitting with adequate free faces and from subsequent edge finishing. In porous rocks, moderate step spacing reduces the tendency to spall. For mating surfaces, uniform splitting energy and a finely tuned borehole rhythm are decisive.<\/p>\n<ul>\n<li><strong>Dimensional tolerances:<\/strong> adhere to specified offsets and perpendicularity to bedding and formwork.<\/li>\n<li><strong>Surface quality:<\/strong> avoid feathering and uncontrolled spalls at visible faces.<\/li>\n<li><strong>Repeatability:<\/strong> consistent borehole geometry and pressure ramps across sequences.<\/li>\n<\/ul>\n<h2>Safety and environmental aspects<\/h2>\n<p>Work in soft rock requires prudent dust and water management. Mechanical methods are inherently characterized by low vibration levels; nevertheless, neighboring structures should be monitored. Personal safety equipment, protection against hydraulic pressure, safe routing of the hydraulic hose line, and an orderly drilling pattern reduce risks. Legal requirements regarding noise, dust, and workplaces must be reviewed for the specific project; information provided here is always general and not individual advice.<\/p>\n<ul>\n<li>Use <strong>dust suppression<\/strong> (water spray or local extraction) and maintain ventilation in confined spaces.<\/li>\n<li>Implement <strong>vibration and noise monitoring<\/strong> with defined threshold values.<\/li>\n<li>Secure hoses against whipping, relieve pressure before coupling, and protect against pinch points.<\/li>\n<li>Ensure clean work areas, marked exclusion zones, and safe lifting with verified anchor points.<\/li>\n<\/ul>\n<h2>Maintenance and operation of hydraulic systems<\/h2>\n<p>Regular visual inspection of hoses, couplings, and wedge\/cylinder components, clean filtration, and oil change intervals ensure consistent splitting and shear forces. Temperature management prevents performance loss under continuous load. Adhering to the system\u2019s specified pressure limits protects the rock and tools from unnecessary stress.<\/p>\n<ul>\n<li>Check torque on critical fasteners and jaw pivots at defined intervals.<\/li>\n<li>Inspect seals, hoses, and quick couplers for leaks and wear; replace on condition.<\/li>\n<li>Keep wedges, reaction shoes, and jaws clean; remove fines to prevent slippage.<\/li>\n<li>Log pressure, temperature, and service actions for traceable performance.<\/li>\n<\/ul>\n<h2>Planning and cost-effectiveness<\/h2>\n<p>Productivity results from a coordinated combination of drilling performance, splitting sequence, and material handling. Costs are positively influenced by minimal rework, dimensionally accurate blocks, and reduced emissions. An early decision between splitting, shear work, or a combined approach improves schedule and budget adherence-especially in urban deconstruction projects and demanding <em>building gutting<\/em>.<\/p>\n<ul>\n<li><strong>Cost drivers:<\/strong> drilling rate, hole pattern density, changeovers, and material transport.<\/li>\n<li><strong>Levers:<\/strong> optimized spacing, calibrated pressure ramps, and coordinated logistics.<\/li>\n<li><strong>Risk buffers:<\/strong> allowance for hard layers, water ingress, and access constraints.<\/li>\n<\/ul>\n<h2>Typical error sources and solutions<\/h2>\n<p>Frequent causes of quality or schedule issues can be avoided with thoughtful preparation. These include a drilling grid that is not adapted, excessive splitting distances in heterogeneous material, missing free faces for crack propagation, too high a feed rate during shear work in porous stones, or undersized <em>hydraulic power pack<\/em>. Remedies include a geologically justified grid plan, gradual load increase, setting relief joints, and a coordinated choice of equipment-preferably with <strong>hydraulic splitters and concrete splitters<\/strong> for crack steering and <strong>concrete demolition shears<\/strong> for precise edge and composite work.<\/p>\n<ul>\n<li><strong>Irregular fracture face &#8211;<\/strong> review borehole alignment and reduce spacing at heterogeneities.<\/li>\n<li><strong>Uncontrolled spalling &#8211;<\/strong> lower feed, use intermittent pressure, and improve edge offsets.<\/li>\n<li><strong>Insufficient split opening &#8211;<\/strong> verify system pressure, wedge condition, and hole cleanliness.<\/li>\n<li><strong>Excessive emissions &#8211;<\/strong> adjust sequence length, enhance dust suppression, and optimize ventilation.<\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Soft rock processing covers the controlled loosening, shaping, and breaking down of naturally formed rocks of low to medium strength such as limestone, sandstone, marl, gypsum rock, tuff, or chalk. In construction, in concrete demolition and special demolition, in natural stone extraction, as well as in rock excavation and tunnel <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/soft-rock-processing\">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":"","_members_access_role":[],"_members_access_error":""},"class_list":["post-20169","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Soft Rock Processing in Excavation &amp; Demolition<\/title>\n<meta name=\"description\" content=\"Precise, low vibration methods for soft rock processing in geology and construction \u2713 Hydraulic splitting &amp; shear.\" \/>\n<meta name=\"robots\" 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