Abstract
Parameter selection is always a critical issue for the numerical modeling of many geotechnical problems. In this work, an idea of non-parameterized numerical analysis is demonstrated by incorporating tri-axial data as the input into the distinct lattice spring model (DLSM). An automatic parameter acquisition procedure is developed to determine the parameters of a modified Duncan–Chang (DC) model which is implemented in the DLSM through the further development of an incremental DLSM and a fabric stress calculation scheme. These newly developed algorithms are verified against available numerical results and experimental counterparts. Then, the discrete feature of the DC-DLSM is explored and discussed through the numerical modeling of large-scale tri-axial tests and a fracturing test. Finally, a real rockfill dam project is analyzed by using the DC-DLSM with the available tri-axial data as the input, and a reasonable fitting is obtained, which shows the possibility for the numerical modeling of the DLSM with no parameter selection burden.
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Abbreviations
- a :
-
The model constant of the Duncan–Chang model
- \(b\) :
-
The model constant of the Duncan–Chang model
- \(c\) :
-
The cohesion
- \(D\) :
-
The dimensionless constant of the Duncan–Chang model
- \(E_{\text{i}}\) :
-
The initial tangent elastic modulus
- \(E_{\text{t}}\) :
-
The tangent elastic modulus
- \(f_{\text{i}}\) :
-
The bond force component
- \(F\) :
-
The dimensionless constant of the Duncan–Chang model
- \({\mathbf{F}}_{ij}^{n,t}\) :
-
The normal interaction forces at t
- \({\mathbf{F}}_{ij}^{n,t - \Delta t}\) :
-
The normal interaction forces at \(t - \Delta t\)
- \({\mathbf{F}}_{ij}^{s,t}\) :
-
The shear interaction forces at t
- \({\mathbf{F}}_{ij}^{s,t - \Delta t}\) :
-
The shear interaction forces at \(t - \Delta t\)
- \(\sum {\mathbf{F}}_{i}^{(t)}\) :
-
The sum of the forces acting on the particle i
- \(F_{y}^{T} (t)\) :
-
The reaction force in the y-direction
- \(G\) :
-
The dimensionless constant of the Duncan–Chang model
- \(k_{\text{n}}\) :
-
The normal stiffness
- \(k_{\text{s}}\) :
-
The shear stiffness
- \(K_{\text{i}}\) :
-
The dimensionless modulus number of the Duncan–Chang model
- \(l\) :
-
The bond length
- \(l_{i}^{0}\) :
-
The initial length of the ith bond
- \(L\) :
-
The length of the cubic specimen
- \(L^{*}\) :
-
The effective length of the cubic specimen
- \(m_{\text{p}}\) :
-
The particle mass
- \(n\) :
-
The dimensionless modulus exponent of the Duncan–Chang model
- \({\mathbf{n}}\) :
-
The normal unit vector
- \(p_{\text{a}}\) :
-
The atmospheric pressure
- \(q\) :
-
The deviatoric stress
- \(q_{j}^{*}\) :
-
The ultimate deviation stress
- \(r_{i}\) :
-
The radius of particle i
- \(r_{j}\) :
-
The radius of particle j
- \(R_{f}\) :
-
The failure ratio
- \({\mathbf{u}}_{i}^{(t + \Delta t)}\) :
-
The displacement of particle i at \(\left( {t + \Delta t} \right)\)
- \({\mathbf{u}}_{i}^{(t)}\) :
-
The displacement of particle i at t
- \({\dot{\mathbf{u}}}_{i}\) :
-
The velocity of particle i
- \({\dot{\mathbf{u}}}_{i}^{(t + \Delta t)}\) :
-
The velocity of particle i at \(\left( {t + \Delta t} \right)\)
- \({\dot{\mathbf{u}}}_{i}^{(t)}\) :
-
The velocity of particle i at t
- \({\dot{\mathbf{u}}}_{ij}\) :
-
The relative velocity between particle \(i\) and particle \(j\)
- \({\dot{\mathbf{u}}}_{ij}^{n}\) :
-
The normal relative velocity between particle \(i\) and particle \(j\)
- \({\dot{\mathbf{u}}}_{ij}^{s}\) :
-
The shear relative velocity between particle \(i\) and particle \(j\)
- \({\dot{\mathbf{u}}}_{j}\) :
-
The velocity of particle j
- \(u_{\text{n}}\) :
-
The normal deformation of the springs
- \(u_{\text{s}}\) :
-
The shear deformation of the springs
- \(u_{\text{n}}^{*}\) :
-
The ultimate deformation of the springs
- \(u_{\text{s}}^{*}\) :
-
The shear deformation of the springs
- \(u_{x}^{L} (t)\) :
-
The average displacement of the cubic left surface in the x-direction
- \(u_{x}^{R} (t)\) :
-
The average displacement of the cubic right surface in the x-direction
- \(u_{y}^{B} (t)\) :
-
The average displacement of the cubic bottom surface in the y-direction
- \(u_{y}^{T} (t)\) :
-
The average displacement of the cubic top surface in the y-direction
- \(u_{z}^{B} (t)\) :
-
The average displacement of the cubic back surface in the z-direction
- \(u_{z}^{F} (t)\) :
-
The average displacement of the cubic front surface in the z-direction
- \(V\) :
-
The volume of the computational model
- \(V^{\prime}\) :
-
The particle’s represented volume
- \({\mathbf{x}}_{i}\) :
-
The coordinate of particle i
- \({\mathbf{x}}_{j}\) :
-
The coordinate of particle j
- \({\mathbf{x}}_{i}^{0}\) :
-
The initial coordinate of particle i
- \({\mathbf{x}}_{j}^{0}\) :
-
The initial coordinate of particle j
- \(\alpha\) :
-
The coefficient of the elastic modulus
- \(\alpha^{ 3D}\) :
-
The lattice geometry coefficient
- \(\beta\) :
-
The translation coefficient of the weight function
- \(\gamma\) :
-
The scaling coefficient of the weight function
- \(\varepsilon_{1}\) :
-
The axial strain
- \(\varepsilon_{v}\) :
-
The volumetric strain
- \(\varepsilon_{x}\) :
-
The strain in the x-direction
- \(\varepsilon_{y}\) :
-
The strain in the y-direction
- \(\varepsilon_{z}\) :
-
The strain in the z-direction
- \([\dot{\varepsilon }]_{\text{bond}}\) :
-
The local strain rate of a spring bond
- \([\dot{\varepsilon }]_{i}\) :
-
The strain rate of particle i
- \([\dot{\varepsilon }]_{j}\) :
-
The strain rate of particle j
- \(\nu_{t}\) :
-
The tangent Poisson
- \(\nu_{t}^{'}\) :
-
The modified tangent Poisson ratio
- \(\nu^{*}\) :
-
The upper limit of the Poisson ratio
- \(\sigma_{1}\) :
-
The major principal stress
- \((\sigma_{1} - \sigma_{3} )_{f}\) :
-
The failure strength
- \(\sigma_{1,j}^{*}\) :
-
The failure first principle stress
- \(\sigma_{3}\) :
-
The minor principal stress
- \(\sigma_{3,j}^{0}\) :
-
The confining pressures
- \(\sigma_{ij}^{{}}\) :
-
The stress of the particle
- \(\sigma_{y}\) :
-
The stress in the y-direction
- \(\varphi\) :
-
The internal friction angle
- \(\chi\) :
-
The dimensionless damping constant
- ∆t :
-
The time step
- \(\xi_{i}\) :
-
The ith component of the normal vector of the lattice bond
- \(\prod\) :
-
The strain energy
- \(\lambda\) :
-
The ratio of horizontal acceleration to gravitational acceleration
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Acknowledgements
This research is financially supported by the National Key R&D Program of China (under # 2018YFC0406800) and National Natural Science Foundation of China (Grant no. 11772221).
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Zhao, GF., Wei, XD., Liu, F. et al. Non-parameterized Numerical Analysis Using the Distinct Lattice Spring Model by Implementing the Duncan–Chang Model. Rock Mech Rock Eng 53, 2365–2380 (2020). https://doi.org/10.1007/s00603-020-02047-w
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DOI: https://doi.org/10.1007/s00603-020-02047-w