Page 133 - Water Standards
P. 133
4 The maximum diameter of rock blocks shall be less than 2 / 3
of the layer thickness.
5 The dam filling material shall be compacted by vibrating roll⁃
ers. The number of times compaction shall be determined by corre⁃
sponding tests.
6 The actual slope filling shall leave a margin of 30-50cm more
than the design section value. For convenience of cutting the slope,
fine materials should be filled within a range of 30-50cm close to the
slope.
7 In the sides or corners where a vibrating roller cannot reach,
fine material of 1-1 5m wide should be filled. A tamping plate is used
to compact, or a thin filling layer is used, and then compacted by a
frog rammer. The dry density compaction at the sides and corners
should not be less than the design value of 96%.
3 1 8 Geotextile filter shall comply with Article 3 1 5 and sand
filter shall meet the following requirements:
1 The sand gradation, silt content and fineness modulus shall
meet design requirements.
2 The filter materials shall be transported by loaders and
levelled manually. After sufficient water is sprayed, a vibratory plate
compactor or plate vibrator is used to compact.
3 1 9 The construction of cushion material and transition material in
the faceplate anti⁃seepage body shall meet the following requirements:
1 The paving width, gradation, uniformity coefficient and per⁃
meability coefficient of cushion material and transitional materials shall
meet design requirements.
2 The lay thickness shall be half that of the rockfill materials,
and compacted by traction type vibration rollers. The edge joint
between every two filling layers and the dam shell material shall be
compacted once. A margin of 30 - 50cm shall be maintained at the
1 2 6