Advances in Civil Engineering / 2018 / Article / Tab 1

Research Article

A Study on the Seepage Flow Characteristics and Disaster-Causing Mechanism of Collapse Column

Table 1

Permeability coefficients of broken sandstone and broken mudstone/ = 5.6  × 10−5 m·s−1.

Particle sizes and axial pressureBroken sandstone (×10−8 m·s−1)Broken mudstone (×10−10 m·s−1)
12461246

Φ = 15–20 mm11154.76151.66149.52137.34175.14157.15154.86126.26
22121.25116.71117.1341.9834.9248.0633.1529.85
3369.5623.2712.453.3314.0417.6716.863.17
441.371.060.730.512.952.052.551.45
Φ = 10–15 mm1182.6977.8975.462.72251.47201.36140.77140.82
2220.758.929.437.6389.4465.0847.1121.86
331.191.010.920.896.395.563.041.78
441.240.620.560.521.450.970.580.66
Φ = 5–10 mm1144.3240.7835.1230.6352.8442.736.3729.92
2215.67.126.985.325.1223.9219.1212.84
331.080.870.680.549.78.677.895.3
440.790.540.510.482.071.771.251.23
Φ = 2.5–5 mm1115.2712.029.428.6936.2632.1825.5220.77
221.81.791.160.929.878.357.236.19
330.490.330.320.283.022.312.051.75
440.230.190.170.140.930.740.660.54
Mixture of different particle sizes: 1 : 1 : 1 : 1117.045.764.723.2416.0513.4710.857.72
221.421.291.090.846.4854.133.87
330.370.310.280.242.121.781.550.98
440.170.150.140.110.550.430.330.29

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