Pouyan Asem
University of Minnesota
Statistical modelDigital image correlationGeologyBrittlenessComposite materialLimit state designAcoustic emissionBase (geometry)Geotechnical engineeringMaterials scienceShear stressStiffnessContext (language use)Applied mathematicsContact pressureShear stiffnessDrilled shaftCompressive strengthMathematicsRock mass classificationFracture (geology)Load testingProbabilistic logicResistance (ecology)Sedimentary rockStructural engineeringGeological Strength IndexShear (geology)
18Publications
6H-index
55Citations
Publications 16
Newest
#1Pouyan Asem (UMN: University of Minnesota)H-Index: 6
#2Paolo Gardoni (UIUC: University of Illinois at Urbana–Champaign)H-Index: 44
Abstract Rock mass elastic and strength properties are needed for calculation of deformation and determination of stability of underground structures. Most available models for prediction of rock mass properties are site-specific, are deterministic, and cannot properly propagate uncertainty in reliability analysis of underground structures. A generalized Bayesian approach is used to develop probabilistic predictive models for the rock mass properties. A set of training and testing databases for ...
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#1Xiaoran Wang (CUMT: China University of Mining and Technology)
#2Pouyan Asem (UMN: University of Minnesota)H-Index: 6
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 30
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Abstract Acoustic emission (AE) and digital image correlation were used to monitor mode I fracture in center notch and smooth boundary specimens. The AE source was characterized as a microcrack and represented by the moment tensor, which was obtained by minimizing the error between displacements calculated from an elastodynamic solution and those measured, subjected to the constraint of a microcrack source. Results showed that microcracking was locally mixed-mode dominant because of oblique micr...
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#1Pouyan Asem (UMN: University of Minnesota)H-Index: 6
#2Paolo Gardoni (UIUC: University of Illinois at Urbana–Champaign)H-Index: 44
Sockets are often constructed into weak rock mass to improve their axial response to applied compressive or tensile loads. This paper first establishes two separate load test databases for the side and base resistances in in situ socket load tests in weak rocks. The databases include the rock socket geometry, rock socket load–displacement response and the rock mass properties. The paper then reviews the available models for the prediction of (i) the axial resistance (compression or uplift), and ...
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#1Pouyan Asem (UMN: University of Minnesota)H-Index: 6
#2Heloise Fuselier (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 1
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 30
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2 CitationsSource
#1Armin Tabandeh (UIUC: University of Illinois at Urbana–Champaign)H-Index: 7
#2Pouyan Asem (UMN: University of Minnesota)H-Index: 6
Last. Paolo Gardoni (UIUC: University of Illinois at Urbana–Champaign)H-Index: 44
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Abstract This paper proposes a general formulation for physics-based probabilistic models that are computationally convenient for uncertainty quantification and reliability analysis of complex systems while integrating the governing physical laws. The proposed formulation starts with the prediction of the quantities of interest using differential equations that represent the governing physical laws. For computational efficiency, the solution of the governing differential equations might be appro...
1 CitationsSource
Abstract Standard penetration test is often used as an index for prediction of geomaterial elastic and strength properties. It consists of releasing a 63.5 kg hammer from a specified distance of 762 mm on a series of connected drill rods. The N-value is defined after a total 457 mm of penetration is achieved by counting the below counts for the last 300 mm of penetration. This required penetration is not often achieved in weak rocks due to their relatively large compressive strength. To eliminat...
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#1F. Guevara-Lopez (UPM: Technical University of Madrid)H-Index: 1
#2Rafael Jimenez (UPM: Technical University of Madrid)H-Index: 18
Last. Pouyan Asem (UIUC: University of Illinois at Urbana–Champaign)H-Index: 6
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ABSTRACTThis paper develops probabilistic predictive models for the unconfined compressive strength of intact rock based on the point load strength tests. A database of point load strength and unco...
5 CitationsSource
#1Pouyan Asem (UMN: University of Minnesota)H-Index: 6
Abstract In situ load tests and theory are used to investigate the effectiveness of expansive concrete on the improvement of side resistance of sockets in weak rock. Two in situ load test databases are used where rock sockets are constructed with normal and expansive concrete. Both databases include the side shear stress-displacement relationships, the rock mass properties and the socket geometry. Using the side shear stress-displacement relationships, the initial shear stiffness, the peak side ...
1 CitationsSource
#1Pouyan Asem (UMN: University of Minnesota)H-Index: 6
#2Joseph F. LabuzH-Index: 30
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#1Pouyan Asem (UMN: University of Minnesota)H-Index: 6
#2Paolo Gardoni (UIUC: University of Illinois at Urbana–Champaign)H-Index: 44
Abstract The design of socketed foundations in weak sedimentary rocks is often governed by settlement. The shear stiffness of the rock socket sidewalls, and the normal stiffness of the rock socket base are the main parameters that affect the settlement of rock sockets at service load conditions and are needed for settlement calculation in load-transfer method or using the theory of elasticity. In this paper, in situ load test data for socketed foundations in weak rocks are collected. The shear s...
4 CitationsSource