Quality inspection and acceptance of mineral tailings dam

1. The temporary flooding standards for the tailings pond during construction period shall be determined in accordance with Table 1G4Z0077.



2. If the rocky soil dam foundation which is easy to weather and easy to disintegrate is excavated and cannot be backfilled in time, the protective layer should be left, or sprayed with cement slurry or sprayed concrete for protection.
3. When grouting the dam foundation, the tm slurry material performance test, the on-site grouting test should be carried out, and the grouting effect should be verified through the inspection hole.
4. When natural Mongolian soil is used as the dam foundation, the protective layer can be pre-positive and removed before filling.
5. Dam foundations of soft loam, collapsible loess, weak interlayer, medium-fine sand layer, expansive soil, and rock-mud structure in the dam foundation shall be carefully treated according to design requirements and meet the design requirements and relevant regulations.

1. The type of dam body filling materials, earth and stone material quality, particle gradation, water content, mud content, super-diameter, weak particles and corresponding filling parts, compaction standards, sampling test results, etc. should meet the design requirements.
2. The upper dam material shall comply with the design regulations, and the corresponding various tests shall comply with the provisions of the construction and acceptance specifications:
1) Density detection: the ring density method should be adopted for the site density detection of the site soil; the r/U sand (irrigation) method should be adopted for the on-site density detection of the gravel soil; the compaction test of the soil and gravel soil with uneven soil quality It is advisable to adopt a three-click method; the on-site density detection of the anti-filter material, the transition material and the sand (gravel) stone should be carried out by the pit-pitting method or the surface wave compaction density meter method; the site density detection of the rockfill material should adopt the pit-pitting method; and many more.
2) Moisture content detection: the drying method should be adopted for the detection of the moisture content of the station soil; the drying method or the drying method should be adopted for the moisture content detection of the sandy soil; the moisture content detection of the filter material, the transition material and the sand (gravel) stone should be adopted. Drying method or roasting method; the moisture content detection of rockfill materials should adopt the combined method of roasting and air drying;
3. The quality control station should be set up in the stockyard, and the quality control of the stockyard should be carried out according to the design requirements, and the properties, gradation and water content of the dam should be checked to meet the requirements, and the drainage, rainproof and negative temperature construction measures should be improved.

1. Dam and body filling should be carried out after the acceptance of the drainage, dam foundation, bank slope and concealed works and the completion of the rolling test.
2. The following contents should be checked for dam filling:
(1) Specifications and quality of rolling equipment, vibrating grinding vibration frequency, excitation rate, pneumatic tire pressure, etc.; paving thickness and rolling parameters and compaction;
(2) The soil level of the anti-seepage body and the treatment of the rolling layer, and the treatment of the rock (concrete) layer in contact with the anti-seepage body meet the requirements;
(3) The combination of dam body and dam foundation, bank slope, rigid building, etc., the treatment and combination of vertical and horizontal joints, the compaction and construction quality of soil-sand joints meet the requirements.
3. The qualification rate of dry density or compaction of anti-seepage soil is required to be not less than 90%. The unqualified dry density or compaction shall not be less than 98% of the design value. The local thickness of each layer of the sand (gravel) stone filter layer or the geotextile protective layer shall not be less than 85% of the design thickness.