Advances in Civil Engineering / 2019 / Article / Tab 1 / Research Article
Shield Equipment Optimization and Construction Control Technology in Water-Rich and Sandy Cobble Stratum: A Case Study of the First Yellow River Metro Tunnel Undercrossing Table 1 Cobbles of particle-size distributions.
Type Statistical indicators Grains composition (%) Uniformity coefficient (C U ) Grains sizes (mm) 100∼60 60∼40 40∼20 20∼2 2∼0.5 0.5∼0.25 0.25∼0.75 0.75∼0.005 Cobble ( ) Minimum value 0 8.8 9.4 3.1 0.6 0.5 0.2 0 2.21 Maximum value 42.3 68.3 32.7 25.7 13.9 12.5 9.4 12 310.73 Average value 11.63 30.84 22.11 15.19 7.09 5.36 4.87 2.91 113.1 Standard deviation 12.890 11.166 5.802 4.905 3.506 3.033 2.458 2.763 66.129 CV 1.109 0.362 0.263 0.323 0.494 0.566 0.504 0.949 0.585 Count 37 Cobble ( ) Minimum value 0 13.4 7.5 2.3 0.5 1 0.8 0.01 9.18 Maximum value 34.5 75.1 38.7 21.24 13.7 11.8 8.5 13.6 1027.13 Average value 6.44 32.73 24.65 13.87 7.7 5.56 4.09 4.87 213.06 Standard deviation 8.6 12.9 6.33 5.39 4.1 2.89 1.69 3.71 239.56 CV 1.335 0.394 0.257 0.389 0.533 0.511 0.412 0.762 1.24 Count 24