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Continuum Modeling of Partially Saturated Soils

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Shock Phenomena in Granular and Porous Materials

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Abstract

Essential features in continuum-scale models for sand and/or clay under high-rate loading conditions are summarized. The scope of this chapter is limited to adiabatic load/unload conditions in order to focus on model features that are most crucial for simulations of buried explosives and similar phenomena that involve shock compression followed by free expansion (possibly with recompression when ejecta impacts an object). Evidence is provided that such conditions fall in a realm for which there is expected to be no substantial difference between additive and multiplicative inelasticity approaches. A new constitutive model, Arena, for fully and partially saturated soils is presented and validated with split-Hopkinson pressure bar experiments. Similarities of the presented cap-plasticity model with quasistatic critical-state theories are briefly mentioned. Simplifying assumptions for a tractable and robust computational model, as well as avenues for further research, are identified. Though the model is calibrated with data that is largely from quasistatic experiments on dry soils it is found to perform remarkably well in predicting the behavior of partially saturated Colorado Mason sand at high strain rates, with mild discrepancies typical of what can be handled via conventional viscoplasticity enhancement.

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Notes

  1. 1.

    Other examples can be found in the following publications and the references cited in them. In [12] the validity of the effective stress model for quasistatic loading of soils with high pore pressure (6 MPa) is reconfirmed. A complete thermodynamic description of multiphase soils and connections between microscopic and macroscopic quantities can be found in [13,14,15,16,17]. An alternative to the “pressure equilibrium” assumption in mixtures and a rigorous definition of fluid pressure are explored in [18]. Alternative approaches based on effective medium theory can be found in [19,20,21]. In [22, 23], the “zero air-pressure” assumption is used to extend the small deformation theory of partially saturated soils to quasistatic large deformations. In more recent papers, the importance of suction is acknowledged but the water and air phases are typically assumed to be incompressible [24,25,26]. The mixture theory developed by Hassanizadeh was extended to finite strains and dynamics in [27,28,29,30]. Phenomenological models have also been developed at a regular pace [31,32,33]. For instance, models for the interaction between damage and fluid flow in porous rocks can be found in [34,35,36]. A cap evolution model for partially saturated soils is described in [37]. Configurational mechanics-based theories and models have also been developed, e.g., [38]. Scant attention has been paid to the deformability of the fluid phases but a few works do address that issue, e.g., [39, 40].

  2. 2.

    Arena (available under open source [48]) has been verified against several analytical tests [53] and validated against data for a variety of sands at different moisture and initial states.

  3. 3.

    Not part of Kayenta, these governing equations are based on work of Uzuoka and Borja [56] (see also [27,28,29,30, 56,57,58]) which is, in turn, a simplification of the averaging theory proposed by Hassanizadeh and Gray [13, 14, 16, 17, 59].

  4. 4.

    This assumption can significantly increase computational overhead if a highly expanded domain impacts an obstacle after a blast event. The problem arises because an RVE does not exist on this distended scale, and might be alleviated via enriched basis functions [61].

  5. 5.

    This model is applied in the “unrotated” configuration to satisfy frame indifference. The applications of interest are assumed to have negligible rotation of reference stretch directions, thus making the symmetric part of the velocity gradient, d, a very good approximation to the rate of Hencky strain and hence (in this approximation) conjugate to Cauchy stress σ.

  6. 6.

    As this theory is described in the context of an additive decomposition of strain rates, it carries with it an implicit potential limitation that reference stretch directions remain approximately stationary or that, by the time such rotations become large, the stress in the material is negligible due to disaggregation. These assumptions are quite reasonable in high-rate buried-explosive applications for which the model was designed. In this context, the unrotated symmetric part of the velocity gradient d equals the rate of reference Hencky strain \(\dot {{\boldsymbol {\varepsilon }}}\) and is conjugate to the unrotated Cauchy stress σ. Because multiplicative decompositions of the deformation gradient should (for initially isotropic media) become additive in these conditions, any claim of their superiority must be backed with (1) demonstrated equivalence to simpler additive models if stretch directions are stationary and (2) compellingly better agreement with validation data when stretch directions rotate.

  7. 7.

    For high-rate applications, a crush curve that is measured in quasistatic conditions must be converted to a form that removes low-rate creep (and other effects from heat transfer, fluid seepage, etc.) that would not occur in dynamic loading. The constitutive model must be furthermore supplemented with viscoplasticity parameters needed to predict apparent strengthening (beyond hardening) that does pertain to slow loading.

  8. 8.

    This particular model has been developed by the authors to fit experimental data on Colorado Mason sand. Existing bulk modulus models, e.g., the Kayenta model, were found to be inadequate for sand. Even if the numerical model is revised to use tabular data for this type of function, this approximate form can potentially serve as an interpolation function that would be more accurate (filling unknown gaps in data better) than a piecewise-linear fit—especially for low-data situations and for extrapolation beyond available data.

  9. 9.

    Experiments at quasistatic strain rates indicate that the saturation can affect the shear modulus [66]. However, these effects are important only at low confining pressures. We are not aware of any analogous experimental studies for high-rate loading.

  10. 10.

    To obtain a numerically tractable set of equations, several simplifying assumptions (such as neglecting elastic contributions to pore pressure) are adopted in [62], suggesting avenues appropriate for future research to justify or replace these choices.

  11. 11.

    Details of the derivation of internal variable evolution equations can be found in [62].

  12. 12.

    Such efforts should be seen as no more objectionable than long-accepted similar procedures in gas dynamics, where the low-rate (isothermal) pressure–volume curve along with the constant-pressure specific heat and thermal expansion properties is sufficient to infer the isentropic properties required for a purely mechanical model to accurately model acoustic waves. The key in such simplifications is to recognize that the resulting mechanical model is, by definition, limited in its application scope.

  13. 13.

    Note that the Arena model does not include damage at this stage and therefore we are only concerned with the rise part of the stress–time curves.

  14. 14.

    These invariants, denoted r and z, do not refer to radial and axial directions of an SHPB rod. Instead, they are radial and axial directions in six-dimensional stress space, defined such that z is the projection of stress tensor onto the hydrostat, while r is the hyper-distance of the stress from the hydrostat, making these, respectively, the magnitudes of the isotropic and deviatoric parts of stress. Unlike more traditional invariants (such as equivalent stress \(q=\sqrt {3J_2}\) and pressure p = I 1∕3), the (r, z) stress invariants are isomorphic to stress space, making lengths and angles in an (r, z) plot identical to those in stress space. For axisymmetric problems, r is a multiple of the difference between axial and lateral SHPB stresses, and therefore discrepancies in r will be magnified whenever the stress difference is small in comparison to the mean stress. Other applications involving larger shearing stresses, on the other hand, would likely exhibit errors that would highlight a long-standing need for induced anisotropy (requiring greater resources to develop and calibrate than what is available in a typical engineering budget).

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Banerjee, B., Brannon, R. (2019). Continuum Modeling of Partially Saturated Soils. In: Vogler, T., Fredenburg, D. (eds) Shock Phenomena in Granular and Porous Materials. Shock Wave and High Pressure Phenomena. Springer, Cham. https://doi.org/10.1007/978-3-030-23002-9_3

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