Influence of Water Content on Safety Factor of Gypsum Selenite Slope Mine

Abstract

Influence of water content on safety factor of gypsum selenite slope mine was investigated. Selenite specimens were prepared cutting into square and were unsoaked and soaked for 7 days. The tests included the determination of density, water absorption, point load strength and direct shear along cleavage [001]. Test results bulk density 2170 kg/m3, water absorption 0.27%, point load strength unsoaking and soaking of 1.44 และ 0.80 MPa, respectively. Average peak and residual internal friction angles of sample unsoaking of 22 and 12º. Beside, the soaking was given 17 and 8º, respectively. Slope face angle of mining calculated under unsoaking provided safety factor led to 85º and soaking slope face angle should not exceed 35º.