BS EN 16907-7:2021 pdf free download – Earthworks Part 7: Hydraulic placement of extractive waste.
— Operation:
— ongoing sampling and testing of construction materials incorporated into the confining structure as part of the quality assurance programme;
— sampling and testing of the deposited extractive waste in order to confirm design parameters and obtain parameters for the design of future embankment raises;
— Closure:
— sampling and testing of cover and confining structure in order to confirm long-term stability;
— sampling and testing of extractive waste in order to provide information on its future behaviour;
— Postdosure:
— sampling and testing of all geomatenals included in the MWF for compliance purposes.
7.3 Geotechnical characterization
7.3.1 General
Geotechnical investigations shall be planned and conducted in such a way that the relevant physical, mechanical and hydraulic parameters of the foundation materials, construction materials and extractive waste are obtained and can be used as the basis for the design of a mine waste facility.
Geotechnical characterization should be carried out through a combination of sampling, laboratory
testing and in situ testing, and should be undertaken in accordance with the requirements outlined in
EN 1997 (series) and National Annexes, EN ISO 22475-1, EN 16907 (series), EN ISO 22476 (series),
EN ISO 22282 (series), EN ISO 17892 (series), EN ISO 14688 (series), EN ISO 14689, and EN ISO 18674
(series).
7.3.2 Characterization of foundation and construction materials
A detailed geotechnical characterization shall be conducted once the final site of a mine waste facility has been selected from the evaluation of all potential sites. The geotechnical investigation shall be adequate to define the ground conditions and identify potential borrow areas for the construction of the confining embankment.
During the geotechnical investigation, samples should be collected for geotechnical and geochemical testing to an agreed plan. All investigation works should be undertaken by appropriately qualified personnel.
NOTE 1 Properly qualified personnel include a competent contractor supervised by a suitably qualified engineering geologist, geological engineer or geotechnical engineer familiar with ground Investigation work.
NOTE 2 A minimum of two geotechnical investigation campaigns are generally undertaken during the development of a new mine waste facility: initially at the feasibility study stage and thereafter during the iInal (detailed) design stage, as shown in Annex 13, Table 8.1. Additional ground investigation campaigns may be required during operation for future embankment raises as well as during the closure works.
7.3.3 Characterization of extractive waste
As a minimum, detailed characterization of extractive waste shall be undertaken during the following phases:
— pre-operational – by means of laboratory testing of pilot and pre-operational (commissioning) samples;
— deposition = by means of in situ testing within the facility, fully supported by further laboratory testing of field samples.
Both the intrinsic and state parameters of the extractive waste should be determined as part of the geotechnical characterization process. Laboratory and field tests available for ground investigation work will yield the majority of properties of the extractive waste. Additional laboratory tests used to characterize extractivc waste are described in Annex A.
7.3.4 Sampling and in situ testing
7.3.4.1 Foundation and construction materials
Sampling and in situ testing ol loundation and construction materials for geotechnical characteritation shall be carried out as part of a geotechnical investigation and shall be in accordance with EN 1997 (series), EN ISO 22475-1 and EN 16907 (series).
7.3.4.2 Extractive waste.