scholarly journals Determining the REV for Fracture Rock Mass Based on Seepage Theory

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Lili Zhang ◽  
Lu Xia ◽  
Qingchun Yu
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Engineering Application ◽  
Existence Condition ◽  
Analysis Tool ◽  
Fractured Rock Mass ◽  
Rock Classification ◽  
Fracture Spacing ◽  
Fractured Rock Masses

Seepage problems of the fractured rock mass have always been a heated topic within hydrogeology and engineering geology. The equivalent porous medium model method is the main method in the study of the seepage of the fractured rock mass and its engineering application. The key to the method is to determine a representative elementary volume (REV). The FractureToKarst software, that is, discrete element software, is a main analysis tool in this paper and developed by a number of authors. According to the standard of rock classification established by ISRM, this paper aims to discuss the existence and the size of REV of fractured rock masses with medium tractility and provide a general method to determine the existence of REV. It can be gleaned from the study that the existence condition of fractured rock mass with medium tractility features average fracture spacing smaller than 0.6 m. If average fracture spacing is larger than 0.6 m, there is no existence of REV. The rationality of the model is verified by a case study. The present research provides a method for the simulation of seepage field in fissured rocks.

Hydro-Mechanical Coupled Analysis of the Variable Permeability Coefficient of Fractured Rock Mass

2013 ◽  
Vol 477-478 ◽  
pp. 531-534
Author(s):  
Yun Jie Zhang ◽  
Tao Xu
Keyword(s):  
Rock Mass ◽  
Permeability Coefficient ◽  
Coupling Effect ◽  
Fractured Rock ◽  
Dynamic Change ◽  
Damage Zone ◽  
Coupled Analysis ◽  
Fractured Rock Mass ◽  
Variable Permeability ◽  
Fractured Rock Masses

Based on the fluid-solid coupling theory, we describe the fractured rock mass as a continuous porous medium and consider the rock mass permeability coefficient a function of the stress and strain. By using the multi-physics coupling analysis software COMSOL, we achieved the dynamic change of permeability coefficient, and found that serious damage due to micro cracking occurred in the excavated damage zone of rock mass due to the yield and failure of rock mass. Corrodingly, permeability will remarkably increase, which is basically consistent with the experimental results. The simulations indicated the "indirect coupling" effect of seepage and stress. Therefore, the coupled analysis of the seepage and stress in fractured rock masses is important for the practical rock mechanics and rock engineering.

scholarly journals Permeability characteristics of fractured rock mass: a case study of the Dongjiahe coal mine

2020 ◽  
Vol 11 (1) ◽  
pp. 1724-1742 ◽  
Author(s):  
Ke Ma ◽  
Longjiang Wang ◽  
Yilin Peng ◽  
Liji Long ◽  
Sujian Wang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Coal Mine ◽  
Fractured Rock ◽  
Fractured Rock Mass ◽  
Permeability Characteristics

scholarly journals Experimental Study of a New Concrete Admixture and Its Function in Filling and Reinforcing Granite Fissures

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Songnan Ru ◽  
Zuozhou Li ◽  
Handong Liu ◽  
Huaichang Yu ◽  
Chunlei Wei ◽  
...  
Keyword(s):  
Rock Mass ◽  
Water Retention ◽  
Fractured Rock ◽  
Triaxial Compression ◽  
Tensile Tests ◽  
Fractured Rock Mass ◽  
Failure Characteristics ◽  
Basic Performance ◽  
Confining Pressures ◽  
Fractured Rock Masses

A concrete admixture with water retention and superhydrophobic properties was developed according to the high tensile strength, fissure resistance, and antiseepage requirements of concrete linings. Capillary water absorption, early-age anticracking, cube compressive strength, and splitting tensile tests were employed to study the effects of the new concrete admixture on the basic performance of concrete. On this basis, a triaxial compression test was conducted on granite fissures filled with concrete containing the admixture; the stress-strain and failure characteristics under different admixture dosages, confining pressures, and fracture widths were analyzed, and the reinforcement effect of the concrete with the admixture on the fractured rock mass was studied. The results show that the admixture can effectively improve the ability of concrete to resist water and fissures, and the concrete with the admixture significantly reinforced the fractured rock mass. Therefore, it can be widely applied in filling and reinforcing fractured rock masses.

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