scholarly journals Numerical simulation of fluid‐solid coupling of fractured rock mass considering changes in fracture stiffness

2019 ◽  
Vol 8 (1) ◽  
pp. 28-37 ◽  
Author(s):  
Yuandong Qiao ◽  
Cun Zhang ◽  
Lei Zhang ◽  
Wei Zhao
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Fractured Rock ◽  
Fractured Rock Mass ◽  
Fracture Stiffness

scholarly journals Calculation of Elastic Modulus for Fractured Rock Mass Using Dimensional Analysis Coupled with Numerical Simulation

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Fengyu Ren ◽  
Jing Zhang ◽  
Zhihua Ouyang ◽  
Hao Hu
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Elastic Modulus ◽  
Dimensional Analysis ◽  
Underground Mining ◽  
Fractured Rock ◽  
Continuum Theory ◽  
Equivalent Model ◽  
Fractured Rock Mass ◽  
Natural Rock

Underground mining activities make the fractures in the natural rock mass develop randomly. The elastic modulus of the fractured rock mass Em is changed with the redistribution and development of the fractures. An equivalent model of fractured rock mass is structured to represent the hydraulic conductivity and the rock mass strain because of the continuum theory. Dimensional analysis is very useful to build relationship of the parameters in complex physical phenomena. Based on the engineering phenomenon of groundwater flowing into the goaf along the fracture in the rock mass, a fuzzy expression among parameters such as the parameter Em, the seepage flow Q, and the exposed area of the goaf A is obtained using dimensionless analysis. To calculate the parameter Em, the fuzzy relationship is then characterized by Darcy’s law and numerical simulation. Under the scripting environment of Python, an automated program to realize the numerical simulation of all scenarios is established, which also provides convenience for drawing the dimensionless flux charts. The results show that the parameter Em can be calculated by the dimensional analysis coupled with numerical simulation. In addition, the parameter Em decreases with the increase of the parameter Q, and the integrity of rock mass is also worse. Finally, a mine example is used to verify the feasibility of the method.

scholarly journals The Deviation of Semi-Theoretical and Semi-Empirical Water Inflow Prediction Formula Based on Sphere Coordinate Conversion and a Grouting Excavation Evaluation Method

2021 ◽  
Vol 11 (24) ◽  
pp. 11956
Author(s):  
Yonghong Wang ◽  
Jiabin Li ◽  
Chuan Wang ◽  
Qin He
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Fractured Rock ◽  
Water Inflow ◽  
Theoretical Formula ◽  
Simulation Methods ◽  
Confined Aquifer ◽  
Fractured Rock Mass ◽  
Numerical Simulation Methods ◽  
Weight Method

The water in the rock medium is exchanged with the confined aquifer through the fracture, which leads to the water inflow line in the confined aquifer is no longer horizontal. This paper assumes that the aquifuge is a kind of semi-isolation layer, while the first-order derivative of the total head slope line function within the influence of precipitation approaches the slope of the line connecting the top plate of the aquifuge with the spherical center. This hypothesis demonstrates the relationship between the bottom of the well water inflow and the complete well gushing water. Laplace’s equation for the spherical coordinate transformation is used to find the analytical solution of the water inflow for stable flow. The calculation results are in line with reality through actual engineering and numerical simulation methods. The current numerical simulation methods and theoretical methods mostly consider the aquifer in the ideal state, which is difficult to simulate the fractured rock mass. The theoretical formula proposed in this paper can more effectively reflect the actual seepage situation of fractured rock mass than other formulas. In addition, the combination of theoretical derivation, numerical simulation and field measurement can predict the water inflow more accurately than unilateral research. At the same time, for the question of whether the face excavation is grouted or not, this paper using the subjective and objective assignment weight method combined with analytic hierarchy process method and entropy-weight method to take the weight calculation and giving a slurry excavation judgment method based on the proposed formula. Theoretical support is given for the selection of permeability coefficients for each hole in the overrun exploration and this method is validated by different projects, which has some degree of reference value.

Study of the geometrical size effect of a fractured rock mass based on the modified blockiness evaluation method

2018 ◽  
Vol 11 (11) ◽  
Author(s):  
Qingfa Chen ◽  
Tingchang Yin ◽  
Wenjing Niu ◽  
Wenshi Zheng ◽  
Junguang Liu
Keyword(s):  
Rock Mass ◽  
Size Effect ◽  
Evaluation Method ◽  
Fractured Rock ◽  
Fractured Rock Mass ◽  
Geometrical Size

Application of Borehole Camera Technology in Fractured Rock Mass Investigation of a Submarine Tunnel

2019 ◽  
Vol 83 (sp1) ◽  
pp. 609 ◽  
Author(s):  
Zengqiang Han ◽  
Chuanying Wang ◽  
Sheng Hu ◽  
Yiteng Wang
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Fractured Rock Mass ◽  
Borehole Camera
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