Method and device for calculating creep time of surrounding rock based on temperature effect
A temperature effect and creep time technology, applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve the problems that cannot reflect, do not consider the influence of temperature on rock creep, and cannot accurately judge the reinforcement of surrounding rocks, so as to improve calculation efficiency Effect
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Embodiment 1
[0039] A method for calculating the creep time of surrounding rock based on the temperature effect, using the classic Poyting-Thomson creep model, considering the influence of temperature on the creep of surrounding rock, obtaining an improved Poyting-Thomson creep model based on the temperature effect, using the improved Poyting- The Thomson creep model represents the relationship between the creep of surrounding rock and time under different temperatures and stresses.
[0040] The relationship between creep of surrounding rock, stress of surrounding rock and stress action time can be represented by viscoelastic body, viscous body and viscoplastic body or a combination of the three. The deformations of viscoelastic body, viscous body and viscoplastic body under the action of stress are recorded as ε ve , ε v and ε vp ,Such as figure 2 shown. In the attenuation creep stage, the creep of surrounding rock ε (t)= ε ve ; In the stable creep stage, the creep of surroundi...
Embodiment 2
[0062] A method for calculating the creep time of surrounding rock based on temperature effects. On the basis of Example 1, this embodiment extends the improved Poyting-Thomson creep model used to calculate the creep of surrounding rock under one-dimensional stress to three-dimensional stress The creep model of the surrounding rock is obtained under the following conditions, and the improved Poyting-Thomson creep model in the three-dimensional state is obtained.
[0063] In a three-dimensional stress state, according to the generalized Hooke's law:
[0064] σ m = 3 Kε m
[0065] S ij = 2 Ge ij
[0066] In the formula, K is the bulk modulus, G is the shear modulus, σ m and ε m are the spherical stress tensor and the spherical strain tensor respectively, the surface in i space, j is the direction in space, i=(1,2,3), respectively represent the surface perpendicular to the X axis and the surface perpendicular to the Y axis and the surface perpendicular to th...
Embodiment 3
[0084] In this embodiment, a method that can be used to fit the temperature-related parameters in Embodiment 1 and Embodiment 2 is provided. This method applies stress to the rock specimen at different temperatures, and draws the rock specimen at different temperatures. Under the action of stress, the curve of the creep and stress action time of the rock test piece, and use the model in embodiment 1 or embodiment 2 to fit the curve, obtain E 1 ( T ), E 2 ( T ), G 1 ( T ), G 2 ( T ), n 1 ( T ), n 2 ( T ), n 3 ( T )and α ( T ) value. The meanings of each parameter and each physical quantity in this embodiment are consistent with those in Embodiment 1 and Embodiment 2.
[0085] In this test, the parameters in the improved Poyting-Thomson creep model under fitting three-dimensional state are taken as an example. The test equipment can be the MTS815 rock mechanics test system, and the test adopts the staged loading method. During the test, first reduce the...
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