{"id":922,"date":"2025-09-25T11:19:31","date_gmt":"2025-09-25T09:19:31","guid":{"rendered":"https:\/\/powermining.fi\/?page_id=922"},"modified":"2025-09-29T09:57:57","modified_gmt":"2025-09-29T07:57:57","slug":"rock-grouting","status":"publish","type":"page","link":"https:\/\/powermining.fi\/en\/services\/rock-grouting\/","title":{"rendered":"Rock Grouting in Tunnel Construction"},"content":{"rendered":"

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 <\/span>from migrating through the rock structure, which extends the service life of the structure.<\/span><\/p>\n

Well-grouted rock is efficient and safe to excavate. Grouting can also prevent the groundwater table from dropping as a result of excavation.<\/span><\/p>\n

In the grouting process, grout is pumped under pressure into grouting holes drilled into the rock, filling cracks and fissures. <\/span>The desired grouting pressure achieved during pumping ensures that the grout spreads as planned.<\/span>The most commonly<\/span>\u00a0used grouting materials are fine-grained grouting cement or various chemical grouting agents.<\/span>\u00a0<\/span><\/p>\n

Different grouting methods <\/span>and materials used<\/span><\/h2>\n

Depending on the site, we use different grouting methods and <\/span>materials.\u00a0<\/span><\/p>\n

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  • Pre-grouting<\/strong> 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.<\/span><\/li>\n
  • Post-grouting<\/strong> 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.<\/span><\/li>\n
  • The primary grouting material is almost always a fine-grained grouting cement mix.<\/strong>However, grouting can also be performed with chemical agents. This is commonly referred to as chemical grouting, <\/span>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.<\/span><\/li>\n<\/ul>\n

    Check out our reference projects<\/span><\/h2>\n

    Power Mining covers every phase of rock construction \u2013 check out our reference projects via the link. <\/span><\/p>","protected":false},"excerpt":{"rendered":"

    Mining, rock support, scaling and loading. We engage in all phases of rock construction.<\/p>","protected":false},"author":5,"featured_media":339,"parent":89,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-922","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/pages\/922","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/comments?post=922"}],"version-history":[{"count":10,"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/pages\/922\/revisions"}],"predecessor-version":[{"id":946,"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/pages\/922\/revisions\/946"}],"up":[{"embeddable":true,"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/pages\/89"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/media\/339"}],"wp:attachment":[{"href":"https:\/\/powermining.fi\/en\/wp-json\/wp\/v2\/media?parent=922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}