Bulk infill grouting is a ground stabilisation technique involving the drilling of boreholes into abandoned old mine workings and underground voids and then stabilising using bulk grout infill.
Bulk infill grouting is typically used to infill large voids beneath the ground such as those left by abandoned mine workings. The technique is normally carried out from temporary cased boreholes drilled within a predetermined square grid pattern across the treatment area. The stability provided from the grout further reduces the risk of void migration that could cause settlement or collapse at the ground surface to facilitate follow on construction activity.