Rock Grouting in Tunnel Construction
Power Mining carries out all phases of rock construction work, including rock sealing by grouting.
Rock grouting is an essential part of safe and sustainable tunnel construction. It is used to reduce the permeability of the rock and improve its sealing properties. The goal is to prevent water from migrating through the rock structure, which extends the service life of the structure.
Well-grouted rock is efficient and safe to excavate. Grouting can also prevent the groundwater table from dropping as a result of excavation.
In the grouting process, grout is pumped under pressure into grouting holes drilled into the rock, filling cracks and fissures. The desired grouting pressure achieved during pumping ensures that the grout spreads as planned.The most commonly used grouting materials are fine-grained grouting cement or various chemical grouting agents.
Different grouting methods and materials used
Depending on the site, we use different grouting methods and materials.
- Pre-grouting is by far the most important stage in terms of sealing the structure, and it is always carried out before tunnel excavation. The aim is to seal the rock a desired number of metres ahead, in order to avoid problems caused by fracturing and water flow.
- Post-grouting can be used to increase the tightness of the rock in specific areas. It is usually carried out only when, for example, individual water-leakage points need to be sealed after excavation.
- The primary grouting material is almost always a fine-grained grouting cement mix.However, grouting can also be performed with chemical agents. This is commonly referred to as chemical grouting, in which the grouting material used is resin-based. This method is particularly suited to small fractures and to sites requiring rapid hardening, where cement-based grouting is not sufficient.
Check out our reference projects
Power Mining covers every phase of rock construction – check out our reference projects via the link.
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Contact our rock construction professionals to request further details about our services.
Services
Mining
At infrastructure and mining sites, we work in tunnels ranging from large tunnel profiles to small widening/roof-raising projects, as well as production mining. Shaft sinking based on the longhole or Alimak method.
We have solid expertise and equipment for tunnel excavation. We have several years of experience in using electronic detonators on a daily basis in vibration-sensitive areas.
Our personnel have a long pedigree in shaft excavation for mining and infrastructure projects. We take an innovative approach to digging shafts in challenging locations.
Includes hydraulic splitting on difficult sites.
Rock reinforcement
Infrastructure projects: full range of rock reinforcement and shotcreting, using a shotcrete robot, rockbolting, wire-mesh reinforcement. We also do manual drilling, wire-mesh reinforcement, and shotcreting on small sites.
Mining sites with our own machinery: cable bolting, wire-mesh reinforcement and all types of rockbolting.
Scaling
In infrastructure and mining projects, we handle scaling both mechanically and manually.
The method is chosen based on the requirements of each site: final surfaces and areas to be reinforced typically require manual scaling to achieve the best result.
A safe working environment is ensured by thoroughly removing loose rocks and boulders before proceeding to the next stages.Mucking
In tunnel construction, we handle mucking using excavators or wheel loaders, collecting and transporting the blasted rock for further haulage.
Efficient mucking keeps the project on schedule, as it is typically the most time-consuming phase of the excavation cycle. The service is delivered as part of our full-service offering, integrating all stages of tunnel construction into one seamless package.
Grouting
Rock grouting is an essential part of safe and sustainable tunnel construction. It is used to reduce the permeability of the rock and improve its sealing properties. The goal is to prevent water migration within the rock mass, which extends the service life of the structure.
