In this paper

a series of triaxial compression experiments was performed to investigate the effects of fracture dip

trace length

gap width

confining pressure and temperature on mechanical properties of the single-fractured rock mass. Experimental results show that the mechanical parameters of rock mass exhibit the quadratic function with dips and the exponential distribution with trace length

respectively. Moreover

the fitting formula (3) is employed to calculate rock mass strength approximately. It is found that rock mass strength linearly increases with the confining pressure. However

Poisson ratio and elastic modulus under negative temperature are independent of the confining pressure. The strength of rock mass decreases with the increase of gap width when it is less than 0.1 mm or greater than 0.8 mm. However

mechanical parameters are irrelevant to the gap width when it locates between 0.1 mm and 0.8 mm. Water

existing in pores and fractures

freezes under negative temperature so that both the cohesion and friction angle between rock particles are increased. Hence

the change of water form is the reason why the rock mass strength increases with reducing temperature. Results also show that the fracture angle affects the initial position of failure surface

the trace length affects the expansion scale of failure surface

and the confining pressure influences the extension direction of failure surface. In addition

the crack dip is the most sensitive influencing parameter to the strength of rock mass

followed by trace length

with the least temperature.