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Roozbeh Geraili Mikola

Roozbeh Geraili Mikola
McMillen Jacobs Associate · Underground

PhD

About

30
Publications
47,508
Reads
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383
Citations
Additional affiliations
November 2018 - August 2021
WSP USA
Position
  • Engineer
August 2012 - November 2018
McMillen Jacobs Associates
Position
  • Engineer
August 2009 - January 2012
University of California, Berkeley
Position
  • Research Assistant

Publications

Publications (30)
Conference Paper
Full-text available
ADONIS is a free finite element program designed to perform deformation and stability analysis of geotechnical structures. ADONIS is an easy-to-use program for various geotechnical projects. It features a full graphical interface for preprocessing or postprocessing and uses an automated unstructured mesh generator to create complex finite element m...
Conference Paper
Full-text available
Observations of the performance of basement walls and braced retaining structures in recent earthquakes show that failures of basement or deep excavation walls in earthquakes are rare even if the structures were not designed for the actual magnitude of the earthquake loading. For instance, no significant damage or failures of retaining structures o...
Article
Full-text available
The Sanitation District of Los Angeles County is planning to construct a 5.5 m inside diameter (18 ft), approximately 11.3-km-long (7 mi) effluent outfall tunnel, to be excavated by TBM and lined with precast concrete segments. This new tunnel will be located in a seismically active region and will cross several seismically active fault zones. Thes...
Article
Observations of the performance of basement walls and retaining structures in recent earthquakes show that failures of basement or deep-excavation walls in earthquakes are rare even if the structures were not designed for the actual magnitude of the earthquake loading. For instance, no significant damage or failures of retaining structures occurred...
Conference Paper
Full-text available
The Wilshire Grand redevelopment project in downtown Los Angeles includes construction of a new 73-story tower. Construction required excavation up to 93 feet deep (28 m). The south side of the excavation, up to 57 feet deep (17 m), required placement of shoring within about 6 to 10 feet (1.8 to 3.0 m) horizontally away from a 400-foot-long (122 m)...
Conference Paper
Full-text available
The Sanitation Districts of Los Angeles County is planning to construct a new, approximately 7-mile-long (11.3 km) effluent outfall tunnel to be excavated by TBM and lined with precast concrete segments. Anticipated net operating pressures within the tunnel are expected to approach 3 bar. To counteract joint opening and exfiltration leakage, an app...
Conference Paper
Full-text available
The Wilshire Grand redevelopment project in downtown Los Angeles includes demolition of a 16-story hotel and construction of a new 73-story tower. Construction of the basement and foundation of the new tower required excavation up to 93 feet deep (28 m). The south side of the excavation, up to 57 feet deep (17 m), required placement of shoring with...
Article
Full-text available
We present a three dimensional fluid-structure coupling between SPH and 3D-DDA for modelling rock-fluid interactions. The Navier-Stokes equation is simulated using the SPH method and the motions of the blocks are tracked by a Lagrangian algorithm based on a newly developed, explicit, 3D-DDA formulation. The coupled model is employed to investigate...
Chapter
We present a three dimensional fluid-structure coupling between SPH and 3D-DDA for modelling rock-fluid interactions. The Navier-Stokes equation is simulated using the SPH method and the motions of the blocks are tracked by a Lagrangian algorithm based on a newly developed, explicit, 3D-DDA formulation. The coupled model is employed to investigate...
Technical Report
Full-text available
Observations of the performance of basement walls and retaining structures in recent earthquakes show that failures of basement or deep excavation walls in earthquakes are rare even if the structures were not designed for the actual intensity of the earthquake loading. Failures of retaining structures are most commonly confined to waterfront struct...
Conference Paper
Full-text available
The evolution of the methodology for the evaluation of seismic earth pressures on retaining structures and basement walls is reviewed together with observations of field performance. The case history data and data from recent experimental work are used to show that the currently used methods are quite conservative and lead to excessively conservati...
Article
Full-text available
The original (i.e. first order) discontinuous deformation analysis (DDA) formulation has two main shortcomings. First, a linear function is used to represent the displacement field in the blocks. This formulation implies that the state of stress (and strain) within each block is constant. Second, the material within each block is assumed as linear...
Article
This paper presents a new point-to-face contact algorithm for contacts between two polyhedrons with planar boundaries. A new discrete numerical method called three-dimensional discontinuous deformation analysis (3-D DDA) is used and formulations of normal contact submatrices based on the proposed algorithm are derived. The presented algorithm is a...
Article
Full-text available
This paper presents a coupled approach using an artificial neural network (ANN) and the finite difference method (FDM) that has been developed to predict the distribution of axial load along fully grouted standard cable bolts in the field using laboratory pullout test data. A back-propagation training algorithm was used in ANN to determine axial lo...
Article
A modified three-dimensional discontinuous deformation analysis (3D-DDA) method is derived using four-noded tetrahedral elements to improve the accuracy of current 3D-DDA algorithm in practical applications. The analysis program for the modified 3D-DDA method is developed in a C++ environment and its accuracy is illustrated through comparisons with...
Article
This paper presents a new contact calculating algorithm for contacts between two polyhedra with planar boundaries in the three-dimensional discontinuous deformation analysis (3-D DDA). In this algorithm, all six type contacts in 3-D (vertex-to-face, vertex-to-edge, vertex-to-vertex, face-to-face, edge-to-edge, and edge-to-face) are simply transform...
Article
Modelling cable bolts as a means of reinforcement in rock masses has developed during last two decades. However a complete integration between a proper cable element model and software with the capability to model discontinuities of the rock mass has not been achieved. In this paper such an attempt is demonstrated and the capabilities of such an al...
Article
The discontinuous deformation analysis (DDA) with second-order displacement functions was derived based on six-node triangular mesh in order to satisfy the requirement for the accurate calculations in practical applications. The matrices of equilibrium equations for the second-order DDA were given in detail for program coding. By close comparison w...
Article
The present study reports the application of a neural network for the prediction of the axial load distribution along fully grouted cable bolts based on a database of laboratory pullout tests on short samples. At first, the network was trained to predict the axial force of a series of short cables grouted with Portland cement at a specific w/c rati...

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Cited By

Projects

Projects (12)
Project
HYRCAN (/hərˈkeɪn/) (by-product of quarantine lockdown) is a free 2D slope stability program for evaluating the safety factor of circular failure surfaces in soil or rock slopes. HYRCAN is simple to use, and yet complex models can be created and analyzed quickly and easily. External loading, groundwater and support can all be modeled in a variety of ways. HYRCAN is free and available via http://geowizard.org. Web Page: http://geowizard.org Developer: Roozbeh Geraili Mikola, PhD, PE
Project
wSlope is designed to perform a quick rock slope analysis on your phone device. wSlope is very simple and easy to use. wSlope uses block theory (Goodman and Shi, 1985) method to estimate the stability of surface wedges in rock slopes. wSlope has the following features: AppStore Link: https://apps.apple.com/us/app/wslope-pro/id1505707625?ls=1 YouTube Link: https://www.youtube.com/watch?v=vF1Fftctw7I&t=8s - wSlope determines Factor of Safety (FOS) for translational slip of a single rock wedge formed in a rock slope by two intersecting joints, slope face, upper ground face as well as tenstion crack (optional). - wSlope provides an integrated graphical environment for fast, easy data entry and 3D model visualization. - Water pressure can be applied on joint planes. Water pressure forces can be represented by arrows displayed at the center of each wedge failure plane, directed normal to the plane. - Seismic Force can be applied to the wedge by selecting the Seismic switch box. If Seismic Force has been applied to a model, the direction and existence of a seismic force will be represented on the 3D model as a yellow arrow at the lowermost wedge vertex on the slope face. - Rock bolts and shotcrete can be applied to increase the wedge safety factor. The support parameters dialog allows user to easily add support and define the support properties for the model. Bolt’s trend angle will be calculated automatically based on the slope direction. User also will be able to modify the parameters. Shotcrete is only applied to the slope face of the model (not the upper slope). Slope face will be shaded gray, to indicate the presence of shotcrete. - The Settings Tab can be used to configure the main analysis parameters for your model, such as Units of Measurement, Project Title. - The brief summary of analysis results and input data will be displayed in the Report Page. The report button, allows user to save the current model’s input and output information into PDF file. The generated report file can be sent out via email.
Project
SimTunnel is designed to perform a quick tunnel analysis on your phone device. SimTunnel is very simple and easy to use. SimTunnel uses "rock-support interaction" or "convergence-confinement" method to estimate the deformation of circular tunnels in weak rock, and visualizing the tunnel interaction with various support systems. SimTunnel has the following features: - SimTunnel determines Factor of Safety (FOS) as the ratio of maximum support pressure to the support pressure required for equilibrium. - The Tunnel and Rock Parameters dialog allows you to define the tunnel and rock properties for model. - The Strength Properties which are required will depend on the strength criteria you have selected in Setting Page. - Both Mohr-Coulomb and Hoek-Brown strength criteria are available. - The parameter calculator dialogs are available to help you to calculate some of the parameters (i.e. GSI, mi, D, UCS, insitu stress and etc). - The support parameters dialog allows you to easily add support and define the support properties for the model. - Three different support types can be added to the model: Rockbolts, Steelsets and Shotcrete - The ground reaction curve (GRC) is always displayed in the output page. - The brief summary of analysis results and input data will be displayed in the Output Page. - The report button, allows you to save the current model’s input and output information into PDF file. The generated report file can be sent out via email.