Study on the Temperature to the Uniaxial Creep Property of the New Similar Soft Rock

Abstract

In this paper, the standard specimen is made of the new similar soft rock, whose cementing agent is paraffin. The standard specimen are experimental research of creep properties under six temperature ranging from 10°C to 60°C, which can obtain that the raising temperature has a huge impact on creep property law of the similar soft rock. The creep curve of soft rock only shows decay and constant creep law within 2h under 10°C and at 2.5MPa. However under 60°C and at low 0.25MPa, the creep law shows acceleration within 2h and the slope of the stress-strain curve is increasing. While the average creep modulus is decreasing and the capacity of resist deformation. COMSOL is used to numerically calculate the creep characteristics of similar roadway. The maximum elastic strain energy density and the maximum equivalent creep rate of roadway increase with the increasing of temperature. The gradient increasing indicate that similar roadway accelerate into the rheological stage under the action of high temperature, When large deformation, instability and failure are more likely to occur. The maximum strain and energy accumulation of roadway occur at the edge and key points of roadway. Strengthening and supporting key areas is the key to the stability of soft rock engineering.