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Monitoring And Quality Control
Published in Jan van ‘t Hoff, Art Nooy van der Kolff, Hydraulic Fill Manual, 2012
Jan van ‘t Hoff, Art Nooy van der Kolff
Hydraulic fill operations may have a significant impact on the ecosystem near a reclamation site. Nowadays dredging works are, generally, only authorised after certain environmental requirements have been met. Environmental monitoring provides the required information to demonstrate that the dredging process complies with the requirements, which are either legally or contractually stipulated. Furthermore, monitoring can assist in the communication with regulators, the public and other stakeholders. Environmental monitoring is performed to: establish the existing environmental conditions in and around the work areas (baseline monitoring);provide environmental data, which can be used to monitor the effects of the works (feedback monitoring);provide information, which can be used to demonstrate that the works are in compliance with the environmental requirements (compliance monitoring).
Supports
Published in Ratan Raj Tatiya, Surface and Underground Excavations, 2013
The wet fill is mainly referred to as a hydraulic fill that is a mixture of filling material with water. After mixing, a slurry is obtained which is transported through pipes to the void to be filled. In the hardening type of hydraulic fill together with water, sand or mill tailings some hardening ingredient is mixed which allows cementing of the filled massif. In pneumatic fill dry filling material is moved via pipes by compressed air. The ores suitable to work as support temporarily should not cake, ignite or oxidize in its loose state. Given below is a comparison made to cover the important features of these back-filling practices.
Experimental study on the natural mixing behaviour of waste rocks poured in a paste backfill
Published in International Journal of Mining, Reclamation and Environment, 2023
One can only see a few publications related to the mixtures of graded waste rocks and tailings [41–43] or the graded waste rocks and cemented hydraulic fill [44]. The abovementioned mixtures require the waste rocks and tailings or hydraulic fill to be mechanically mixed in pipes or special mixing machines. Crushing and sieving are also necessary to limit the sizes of waste rocks. These mechanical mixtures are thus completely different from the natural mixture of waste rocks poured in a paste backfill. Recently, Veenstra & Grobler [45] present a concept, by which a waste rocks structure is built and wrapped by cemented paste backfill. It can also allow the maximum use of waste rocks and avoid the transportation and hoisting of waste rocks from underground to ground surface. However, they do not show how the poured waste rocks are mixed with the paste backfill in a stope.
Application of a generalised plasticity model in high earth core dam static and dynamic analysis
Published in European Journal of Environmental and Civil Engineering, 2020
Kuangmin Wei, Shengshui Chen, Guoying Li, Huaqiang Han
Statistical results of the relationship of the PGA and dam settlement in the historical earthquakes are shown in Figure 41, in which, CFRD represents the Concrete Faced Rockfill Dam, ECRD represents the Earth core Rockfill Dam, HF represents the Hydraulic fill dam, and EARTHFILL represents the earthfill dam. Results indicate that residual settlement of hydraulic fill dam and earthfill dam is larger than CFRD and ECRD in historical earthquakes, generally.