|
Abstract Taking open granite in Songliao Basin as study object, uniaxial compression, uniaxial tensile and acoustic tests of the high temperature granite after natural cooling and water cooling are carried out. The relationship between granite temperature (100℃, 200℃, 300℃, 400℃, 500℃, 600℃, 700℃, 800℃, hereinafter referred to as 100℃-800℃) and superficial morphology, longitudinal and transverse wave velocity, elastic modulus, poisson's ratio, compressive strength and tensile strength after cooling in different ways is studied. Moreover, the relationship between longitudinal and transverse wave velocity and compressive strength and elastic modulus was established. Meanwhile, the influence of static setting process on the mechanical-acoustic properties of granite after water cooling is considered. Researches show that: (1) The mass and longitudinal wave velocity decreases mainly during the period of standing 0-2h, while the change rate after 6h is negligible. There is a linear relationship between the amount of free water loss and the amount of mechanical-acoustic characteristic loss. (2) With the increase of temperature, the longitudinal and transverse wave velocity, elastic modulus, compressive strength and tensile strength of granite decline linearly after natural cooling, while they descend in a concave pattern after water cooling. When the temperature is higher than 300℃, the mechanical-acoustic parameters of granite after natural cooling are all greater than that under water cooling, while the change rate of poisson's ratio is opposite. At 600℃, the influence of different cooling methods on the longitudinal and transverse wave velocity, elastic modulus and compressive strength of granite reached the maximum, and water-cooling was 33.33%, 31.88%, 53.33% and 31.74% lower than that of natural cooling, respectively. At 700℃-800℃, the influence of cooling method on the mechanical and acoustic characteristics of granite decreases. (3) With the increase of temperature, the relationships among longitudinal and transverse wave velocities, compressive strength and elastic modulus of granite demonstrate good correlations. The conclusions can improve the accuracy of measurement of mechanical-acoustic characteristics of granite, which will provide a feasible method for prediction of mechanical properties and provide basis for evaluation of safety and stability of geotechnical engineering.
|
|
Received: 03 July 2019
Published: 28 December 2019
|
|
|
|
|
|
2019, Vol. 40 
