Mechanical Properties of Sandstone Roof and Surrounding-Rock Control of Mining Roadways Subject to Reservoir Water Disturbance

Table 1

Basic physical parameters of specimens.

Test number	Test plan	Natural mass (g)	Natural density (g/cm^3)	Saturated mass (g)	Saturated mass (g/cm^3)	Saturated wave velocity (km/s)	Porosity (%)
S-1	Unloading without pore pressure	416.69	2.23	441.31	2.36	2.10	13.60
S-2	Unloading at 0.1 MPa pore pressure	410.53	2.25	434.73	2.38	2.23	13.51
S-3	Unloading at 0.2 MPa pore pressure	417.83	2.22	442.17	2.35	2.10	13.36
S-4	Unloading at 0.4 MPa pore pressure	420.77	2.23	446.25	2.36	2.13	14.00
S-5	Unloading at 0.6 MPa pore pressure	415.69	2.26	439.08	2.39	2.17	13.19