Study On Equivalent Mechanical Behavior Of Jointed Rock Mass And Application In Engineering

The scale, number and complexity of the rock mass has increased following with the development of economy and increased investments on infrastructure. The problems of rock mass engineering need to be addressed become increasingly intricate. People gradually realized that joints have played an important role in the security of rock mass engineering on the basis of many large engineering practices and a series of rock engineering failure accidents analysis. From this perspective, the mechanics properties of jointed rock mass need to be resolved are promising in the domain of rock mass mechanics.Although numerical calculation method has been applied extensively to the engineering design along with computer technology development, the rock mass engineering controlled by the joints is still difficult to describe reasonably due to the complexity of mechanical characteristics, which limited the range of various analysis methods in rock mass engineering application. Equivalent constitutive relation of jointed rock mass has been explored and In order to further understand the mechanical properties of jointed rock mass, slope engineering excavation has also been analyzed in the present study. The major tasks are as follows:(1) The distribution model of geometric parameters of random discontinuities is summarized from geometry characteristic parameters such as joint spacing, trace length, etc. In addition, sample numbers existing in joints network simulation technology are ascertained by dichotomy.(2) According to the basic principle of continuum mechanics, equivalent elastic matrix of rock mass is derived using the principle of equivalent deformation. Associating random discontinuities with auxiliary structural plane, on calculation idea of jointed rock mass equivalent deformation parameter is performed by means of discrete element method.(3) In accordance with the calculation principle of Monte Carlo method determining connectivity rate of jointed rock mass mechanics, the parameter sensitivity of jointed connectivity rate is carried on. Then its influence on the jointed connectivity rate is discussed as well from simulation times, simulated size, bandwidth length and average normal stress, etc., thereby offering basis for calculating parameters determination.(4) Using subroutine modules of finite element software ABAQUS, The equivalent constitutive model applicability of joints materials based upon the intensity parameter anisotropic is explored and a discussion on ubiquitous-joint model in geotechnical engineering is also conducted. Meanwhile, an example analysis of two different jointed rock mass models is performed in the paper.(5) This paper has analyzed and discussed the issues of initial field stress and engineering excavation in geotechnical engineering. Numerical simulation of initial self-weight field stress of slope engineering and stress release during the process of excavation is conducted employing subroutines in the question of excavation of slope.