Medium-high strain rate dynamic damage constitutive model suitable for hard rock and application method thereof
A high strain rate, constitutive model technology, applied in the field of dynamic damage and hard rock strain, can solve the problems of not considering the strain rate effect, and can not reflect the test damage realistically and objectively, so that the method is feasible, more reliable and The effect of accuracy
Pending Publication Date: 2021-05-14
ARMY ENG UNIV OF PLA
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Problems solved by technology
[0005] In order to solve the above problems, the embodiment of the present invention provides a medium-high strain rate dynamic damage constitutive model suitable for hard rock and its application method, which effectively avoids the damage model suitable for hard rock established in the prior art. The analysis of the test results does not consider the influence of the strain rate effect on the damage evolution, and it cannot reflect the defects of the test damage objectively.
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[0048] The embodiments of the present invention will be further described below in conjunction with the drawings and embodiments.
[0049] In the article "Research and Application of ZWT Nonlinear Thermoviscoelastic Constitutive Relation", it is believed that the damage evolution of hard rock materials under dynamic load can be regarded as a stress-promoted thermal activation process D, and the stress-promoted thermal activation process D is as follows: Formula (1) shows:
[0050]
[0051] In the formula, K D , α is the dynamic response parameter of the material.
[0052] Suppose there is a strain threshold ε 0 , when the peak strain is less than the threshold, no damage occurs, and when the strain is greater than or equal to the threshold, the damage evolution is a thermal activation process, and the hard rock dynamic damage evolution equation is shown in formula (2):
[0053]
[0054] Due to the difficulty in monitoring the damage evolution of the rock dynamics test...
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The invention relates to a medium-high strain rate dynamic damage constitutive model suitable for hard rock and an application method thereof, and the method comprises the following steps: firstly, coring in an engineering in-situ rock mass to prepare a rock sample, and measuring basic physical parameters including the longitudinal ultrasonic wave velocity of the sample before a test; then carrying out a uniaxial SHPB pressure dynamic mechanical test on the rock sample, and measuring the longitudinal wave velocity of the sample after the test again; obtaining a rock sample stress-strain curve through calculation according to the SHPB theory, and determining a rock material damage initial strain threshold value based on the corresponding relation between the longitudinal wave velocity and the peak stress; and finally, fitting the SHPB test curve through the medium-high strain rate dynamic damage constitutive model suitable for the hard rock to obtain accurate model parameters. The defect that the test damage cannot be actually and objectively reflected due to the fact that an established damage model suitable for the hard rock breaks away from result analysis of a material test and the influence rule of the strain rate effect on damage evolution is not considered in the prior art is effectively overcome.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of hard rock strain and also belong to the technical field of dynamic damage, and specifically relate to a medium-high strain rate dynamic damage constitutive model suitable for hard rock and an application method thereof. Background technique [0002] Hard rock is a kind of rock classified according to its compressive strength. With the construction of infrastructure such as water conservancy projects, tunnel projects, underground energy storage and the development of underground mining projects, the stability and safety of surrounding rock after excavation In particular, drilling and blasting is the main method for excavating hard rock mass. The dynamic loading of rock is significantly different from the static loading in terms of action time and material transient deformation. The traditional constitutive model obtained by conventional mechanical tests without considering the in...
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Login to View More IPC IPC(8): G06F30/20G01N33/24
CPCG06F30/20G01N33/24
Inventor 李二兵濮仕坤高磊段建立卢辉潘越
Owner ARMY ENG UNIV OF PLA