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Method for constructing non-penetrated jointed rock mass damage constitutive models under plane compressive shear stress

A technology of fractured rock mass and constitutive model, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not considering the influence of fracture deformation parameters, and achieve the effect of overcoming errors

Active Publication Date: 2018-09-07
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

However, the above two types of damage tensor calculation methods for fractured rock mass do not consider the influence of fracture deformation parameters.

Method used

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  • Method for constructing non-penetrated jointed rock mass damage constitutive models under plane compressive shear stress
  • Method for constructing non-penetrated jointed rock mass damage constitutive models under plane compressive shear stress
  • Method for constructing non-penetrated jointed rock mass damage constitutive models under plane compressive shear stress

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Embodiment 1

[0119] For example figure 1 The mechanical properties of the rock mass with only a single non-penetrating fracture shown in the plane compressive shear stress state are analyzed.

[0120] Assuming that the height and width of the rock mass specimen in the plane are 10cm and 5cm respectively, the analysis is carried out according to the plane stress problem, that is, the thickness in the third direction is taken as the unit thickness; the length, thickness and internal friction angle of the non-penetrating crack And cohesion, normal and tangential stiffness are 4cm, 1cm, 30°, 0.1MPa, 0.01GPa / cm and 0.02GPa / cm, respectively. The elastic modulus, Poisson's ratio and fracture toughness of the corresponding intact rock are 10GPa, 0.2 and 10MPa.cm 1 / 2 . Assume that the stress state of the specimen is: σ x =5MPa, σ y =20MPa, τ xy = 5MPa. Then, according to the method proposed by the present invention, the rock mass damage variable caused by cracks in the vertical direction is o...

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Abstract

The invention relates to a method for constructing non-penetrated jointed rock mass damage constitutive models under a plane compressive shear stress. The method comprises the following steps of: associating additional strain energy increments caused by crack in fracture mechanics with damage mechanics strain energy burst sizes, and importing the additional strain energy increments and the damagemechanics strain energy burst sizes into a non-penetrated crack extension criterion so as to put forward an external force-considered calculation formula for jointed rock mass damage variables; and finally obtaining a crack parameters (internal causes) and stress conditions (external causes)-considered non-penetrated jointed rock mass damage tensor calculation method, so as to establish a corresponding damage constitutive model. According to the method, the condition of considering external force is suitable for influences caused to rock mass damage variables by common stress states (not comprising positive stress and comprising shearing stress, and suitable for single-axis or double-axis stress states only comprising positive stresses), so that the defect that only rock damage variable calculation under double-axis pressure, namely, influences caused by rock damage variables by confining pressure , is considered in variable calculation of rock mass damages caused to cracks by externalforce in the prior art is overcome.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering constitutive model research, in particular to a method for constructing a constitutive model of non-penetrating fractured rock mass under plane compressive shear stress, which is used for various types of rock and soil such as mining, slopes, tunnels, roads, and dam foundations Research on engineering constitutive models. Background technique [0002] Rock masses in actual engineering are formed through long and complex geological processes, so they all contain many natural defects such as joints and fissures of different sizes, which are collectively referred to as fissures here, and correspondingly, such rock masses are also called fissure rock masses . The existence of cracks and their interaction will lead to obvious stress concentration, which will greatly affect the strength, stiffness and failure mode of rock mass. Therefore, the research on the mechanical properties of cracked rock...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 刘红岩谢天铖李凯何健袁梦军冯鑫侯思雨
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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