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A New Method for Three-Dimensional Fracture Network Modelling for Trace Data Collected in a Large Sampling Window

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Abstract

This study presents a new three-dimensional (3D) network modelling method for fractures collected in a large sampling window, in which the determination of fracture disc diameter is the critical step. To derive the diameter, the disc radius of the fractures of the investigated exposed rock surface is initially obtained based on the collected trace lengths. Then, the disc radius of the fractures in 3D space is deduced. The determination of the density and orientation of fractures is also included in the study. Subsequently, the 3D fracture networks for each fracture set are generated based on the derived diameter, density and orientation. To verify the rationality of the method, the rock masses downstream of the sluice gate of Datengxia hydropower station are selected as study objects, and a plane with identical orientation to the exposed rock surface is intersected by the network, thereby obtaining the fracture traces in the plane. The statistical characteristics of fracture traces in the plane and those of the exposed rock surface are highly similar. Thus, the proposed method is feasible.

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Abbreviations

A :

The area for fracture collection in the field [m2]

A′:

The intersection area between the three-dimensional fracture network and the virtual exposed rock surface [m2]

α :

The average intersection angle of the fracture disc to the exposed rock surface in an interval of dip angle [°]

ch:

Half-trace length [m]

χ 2 :

Chi square [–]

D :

Standard deviation [–]

E :

Average value [–]

F :

The random numbers of ch2 [m2]

F′ :

The random numbers of truncated ch2 [m2]

f :

The probability that a fracture can be collected on the exposed rock surface [–]

γ :

The scale parameter of gamma distribution [–]

θ :

The intersection angle of the fracture disc to the exposed rock surface [°]

k :

The shape parameter of gamma distribution [–]

L :

The height of three-dimensional space that accommodates the fractures [m]

λ :

The rate parameter of negative exponential distribution [–]

M S :

Magnitude of earthquake [–]

μ :

The identical location parameter of logarithmic normal distribution [–]

N :

The number of fractures collected in the field [–]

N′ :

The number of fracture traces in the virtual exposed rock surface [–]

N α :

The number of fractures collected from the field intersecting the exposed rock surface at an average intersection angle of α [–]

N α :

The number of fractures in three-dimensional fracture network intersecting the exposed rock surface at an average intersection angle of α [–]

n :

The number of fractures in the three-dimensional fracture network (fracture density) [–]

n ab :

The number of fractures with radius between a and b that intersects with the exposed rock surface [–]

nab :

The number of fractures with radius between a and b in three-dimensional space [–]

P 1 :

Frequency of fractures of different orientations in the field [%]

P 2 :

Frequency of fractures of different orientations in three-dimensional fracture network [%]

P 20 :

Number of fracture traces per unit area [m−2]

P 21 :

Total length of fracture traces per unit area [m/m2]

r :

Fracture disc radius [m]

r′ :

Fracture disc radius in three-dimensional space [m]

σ :

The identical location parameter of logarithmic normal distribution [–]

u :

The distance between the fracture disc centre and the midpoint of the fracture trace [m]

U(0,1):

Uniform distribution between 0 and 1

X :

The number of intervals divided from the random numbers of r [–]

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Acknowledgements

This work was supported by National Key Research and Development Plan (Grant No. 2017YFC1501000), the National Natural Science Foundation of China (Grant Nos. 41877220 and 41472243), and National Natural Key Science Program Foundation (Grant No. 41330636).

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Nie, Z., Chen, J., Zhang, W. et al. A New Method for Three-Dimensional Fracture Network Modelling for Trace Data Collected in a Large Sampling Window. Rock Mech Rock Eng 53, 1145–1161 (2020). https://doi.org/10.1007/s00603-019-01969-4

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