Elastic-slip interface effect on dynamic stress around twin tunnels in soil medium subjected to blast waves

Fang, Xue-Qian; Zhang, Tengfei; Li, Bailin; Yuan, Rui-Jia

doi:10.1016/j.compgeo.2019.103301

“…For instance, the time-harmonic interactions between semicoherent heterophase interfaces with core-spreading dislocation structures [63] with extrinsic dislocation loops [64] and interfacial cracks [65,66] in multifunctional composites would be of great importance to understand their effects on the natural frequencies and lower and higher thermoelastic mode shapes for future renewable energy devices in aerospace structures [67]. Due to the present versatile formalism to take care of imperfect interfaces, other interfacial considerations as the elastic-slip interface model [68,69] and surface/interface model [70] raised by Gurtin and Murdoch [71] can be introduced for appropriate applications, as well as nonlocal size effects [13] in nano-and micro-scale structures. ii , and (f) von Mises stress # vm .…”

Section: Discussionmentioning

confidence: 99%

Free vibration of fully coupled thermoelastic multilayered composites with imperfect interfaces

Vattré

¹

,

Pan

²

,

Chiaruttini

³

2021

Composite Structures

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A fully coupled thermoelastic framework is formulated to cope with the free vibration response of anisotropic multilayered plates in three dimensions. The laminated structure consists of homogeneous laminae of arbitrary thickness and width under simply supported edge conditions in thermal environment. The general and exact field expressions of the temperature, heat flux, displacement and stress components are expressed in terms of double Fourier series expansions in any rectangular plate, which lead to the extended Stroh formalism with thermomechanical coupling effects in a concise and compact matrix form. Different imperfect interface conditions are introduced to characterize specific structural and thermal contact properties at the bounding interfaces, and further to determine the finite complex valued coefficients in the suitable series relations. The complete time-harmonic solutions in the laminated composites in the presence of perfect/imperfect interfaces are recursively obtained by means of the modified dual variable and position technique with explicit layer-to-layer transfer matrices. Results are obtained for different layups, length-to-thickness ratios and interfacial boundary conditions for two application examples, namely the graphite/epoxy cross-ply composites and the thermal barrier coatings on superalloys, without suffering from numerical exponential instability. These investigations reveal that the natural frequencies and first and higher vibration mode shapes of the multilayered structures can be considerably affected by increasing the environmental temperature and the severity of the interfacial imperfections. Since the through-thickness stress distribution in 2, 5, and 10 layered composites appears to be strongly correlated to the layups, such modal stress analysis could be exploited to locate the fatigue hotspots operated in dynamic structures and to guide the structural design of aircraft and spacecraft composite laminates subjected to residual vibrations.

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“…At present, the parameter design and data management are usually compiled manually, which leads to a series of problems in actual engineering, such as nonstandard blasting design, complex, and fragmentary blasting parameters. Therefore, how to change the backward situation of manual design calculation, drawing, and manual compilation and management of blasting data has become an urgent problem in the field of blasting and tunnel engineering [4][5][6]. With the continuous development of information technology and computer hardware, the concept of digital mines continues to deepen and improve.…”

Section: Research Status Of the Intelligent Blasting Design Systemmentioning

confidence: 99%

Design and Realization of the Intelligent Design System for Tunnel Blasting in Mine Based on Database

Wu

¹

,

Luo

²

,

Guan

³

2020

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With the improvement of informatization and standardization of mine development, it is an inevitable trend to apply computer technology to the intelligent design of tunnel blasting excavation. Seeking to the problems existing in the intelligent design system of blasting excavation, a new intelligent design system of blasting excavation is constructed from the perspective of database technology. The new intelligent design system adopts the design of central database system and subuser rights to meet the data synchronization and sharing among different users. At the same time, the new system also extracts blasting design parameters and actual engineering data and designs a more reasonable and comprehensive database structure, database logic, and data word table. Based on the T-S fuzzy neural network model, the intelligent search rules of excavation blasting data are also constructed in the new system. Finally, based on Oracle and VB.NET as the new system development platform, MFC, and ADO as the new system development technology, the new intelligent design system for tunnel blasting and excavation was completed. The implementation of the new system addresses the needs of blasting data information storage and search and lays a foundation for the informatization and standardization of tunnel excavation blasting.

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“…Carranzatorres and Fairhurst [5] stated that closed-form results can help engineers assess the general accuracy of numerical analysis and provide valuable means for obtaining insights into the general nature of a solution. Elasticity problems can be solved by combining the complex variable method with numerous theorems arising from analytical functions, such as Cauchy's integral theorem, Laurent's theorem, and theorems on conformal mapping [6,7]. ese theories are widely used for the first fundamental problem of deep tunnels.…”

Section: Introductionmentioning

confidence: 99%

Analytical Method to Interpret Displacement in Elastic Anisotropic Soil due to a Tunnel Cavity with an Arbitrary Cross Section

Zhang

¹

,

Cheng

²

,

Lou

³

et al. 2021

Advances in Civil Engineering

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Based on complex variable theory and conformal mapping method, the paper presents full plane elastic solutions around an unlined tunnel with arbitrary cross section in anisotropic soil. The solutions describe soil elastic solutions for assuming that the displacement vectors along the tunnel boundary are directed towards the center of the tunnel. Tunnels with different cross sections are used to illustrate the method and its correctness. An elliptical unlined tunnel case is discussed in detail in the paper. Using the image method, an approximate solution for predicting surface displacement and subsurface horizontal displacement around an unlined tunnel in anisotropic soil can be obtained. The results show anisotropic stiffness properties n n = E h / E v and m m = G v h / E v have a great effect on the displacement distribution patterns around an elliptical tunnel with certain shape.

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Elastic-slip interface effect on dynamic stress around twin tunnels in soil medium subjected to blast waves

Cited by 47 publications

References 25 publications

Free vibration of fully coupled thermoelastic multilayered composites with imperfect interfaces

Free vibration of fully coupled thermoelastic multilayered composites with imperfect interfaces

Design and Realization of the Intelligent Design System for Tunnel Blasting in Mine Based on Database

Analytical Method to Interpret Displacement in Elastic Anisotropic Soil due to a Tunnel Cavity with an Arbitrary Cross Section

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