Spe Rock-Valley-Direct-Comparison Chemical Explosions Near-Field 3-D Ground Motion Simulations and Predictions
Description:
Rock Valley Direct Comparison (RV/DC) is Phase III of the Source Physics Experiment (SPE) series. The first explosion, RVDC-1, is a 1-ton equivalent TNT located at 1.8km depth, while the second, RVDC-2, is a 10-ton equivalent TNT located at 1.7km depth. The local geology of the site is complex and encompasses a deep hard-rock (dolomite starting at 1km depth) and the shallow 1km is a mixture of tuff and sedimentary layers, deposited under a rugged topography. The water table is located nearly 500m deep. The layered beds are crosscut by a series of faults. The source package is sized to be 3.5 to 4.5 feet diameter emplaced in a 4 to 5 feet diameter ground-zero (GZ) borehole RV/DC includes two chemical explosion experiments. The characterization of the geology is limited and includes one straight continuous core-hole (CH), and two directional observation boreholes (OB) cored as needed sporadically. Based on this complex geological conceptual setting, we have conducted 3-dimensional non-linear numerical simulations of the ground motions generated from both explosions. First, we used deterministic geophysical properties of the layered model and assessed the response of the system with and without the faults to assess their effect on the anisotropic radiation of the ground motions. Second, because of the limited characterization of the site, we have included stochastic variations in the geological layers. We adopted a scheme of including stochastic discrete fractures in the deep dolomite layer (analogue to SPE Phase I), while a continuous stochastic variation of lenses in the shallow geological layers (analogue to SPE Phase II). Assessing the effect of those stochastic parametrizations on the overall response of the system were obtained using a sophisticated interval Monte Carlo method. Material models have been calibrated to laboratory experiments and assessed under variably saturation conditions. Differentials of ground motion under different conditions of physical and structural uncertainties are then derived for both RVDC-1, RVDC-2, and a hypothetical earthquake.
Session: Physics-Based Ground Motion Modeling - I
Type: Oral
Date: 5/3/2024
Presentation Time: 09:00 AM (local time)
Presenting Author: Souheil
Student Presenter: No
Invited Presentation:
Authors
Souheil Ezzedine Presenting Author Corresponding Author ezzedine1@llnl.gov Lawrence Livermore National Laboratory |
Oleg Vorobiev vorobiev1@llnl.gov Lawrence Livermore National Laboratory |
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Spe Rock-Valley-Direct-Comparison Chemical Explosions Near-Field 3-D Ground Motion Simulations and Predictions
Session
Physics-Based Ground Motion Modeling