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  • 1
    Electronic Resource
    Electronic Resource
    The Mechanism Investigation on Propagation and Coalescence Pattern of Three Internal Plane Flaws in Brittle Materials (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 739-742 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Under the action of compressive load, the growth and coalescence containing flaws inbrittle materials (rock and rocklike materials e.g.) will result in the local buckling and globalfracture of rockmass. But, the mechanisms on propagation and coalescence of 3-dimensionalinternal flaws are not clear till now. We examine brittle fractures of manmade specimens usingfrozen casting resin and rocklike material to observe 3D internal flaws growth process at about -30°C. A team of specimens containing three internal flaws is measured; flaws are made of threeparallel oblong aluminum films. The propagation and coalescence pattern of three internal flaws isobserved under compressive stress. An interesting phenomenon is that the crack initiated from thesecond flaw quickly turns to the one induced from the third flaw and forms a bigger fracture plane,then splits the specimen. It shows that the flaw distribution pattern will greatly affect the flawsgrowth and coalescence process. The mechanisms that lead to the wing and anti-wing crackinitiation and coalescence are described
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.739.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Model Testing and Analysis Study on Shear Strength of Rock Mass Containing Multiple Cracks under Compression-Shearing Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 617-622 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two-phase modelling testing was performed to study the shear strength of rock bridges ofjointed rock mass in this paper. The failure process of rock sample containing multiple collinearcracks was observed. Based on theory of fracture mechanics and analytical method, a rock-bridgefailure model was proposed and the expression of shear strength was derived. Comparison ofcalculated shear strength and the model test results was made and they agree well
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.617.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Constitutive Model of Anchored Jointed Rock Mass and its Application (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 657-662 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The jointed rock mass distributed in the nature widely and its mechanical characteristicinfluenced the stability of the rock engineering badly. The cracks propagated and coalesced eachother and macroscopic failure happened. Bolts were a kind of effective reinforcement instrumentand they could prevent the cracks from propagating. However, the anchoring mechanism of boltswas not realized clearly and their reinforcement could not be reflected effectively in the numericalsimulation yet. Based on the damage mechanics, a constitutive relation and damage equation ofanchored jointed rock mass were presented in this paper. With a project application, the model wasproved to be feasible one
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.657.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Research on 3D Geomechanics Model Test for a Large-Scale Offspur Tunnel Project (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 557-560 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Geomechanics model test has some distinctive advantages in simulating changing lawsof stress and strain of rockmass as well as failure mechanism of surrounding rockmass of tunnel. Inorder to systematically study mechanics deformation properties of a large-scale offspur tunnel underexcavation state, we design and manufacture a large scale 3D model test rack installation withhydraulic equipment. The test rack is 3.7 meters long, 2.2 meters wide and 4 meters high, which isthe largest 3D geomechanics model test rack in present Chinese communication trades. Thenew-type similar material of model is a kind of cementitious composite which is mixed with ironore powder, blanc fix, quartz sand, rosin, industrial alcohol and gypsum powder. 3D geomechanicsmodel test for a large-scale offspur tunnel is carried out by utilizing the test installation and thesimilar material. The original design and construction of the offspur tunnel has been effectivelyoptimized by results from model test
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.557.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    New Type Geo-Mechanical Similar Material Experiments Research and Its Application (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1801-1804 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It is very important to choose a similar material which simulates rock mass correctly ingeo-mechanics model test. In this paper, we introduce similar material research status and analyzethe principle of selecting and compounding. According to the experiences of similar materialresearch, we develop a new similar material (we call it iron barites sand cementation material,abbreviate IBSCM) through hundreds of compounding experiment. This similar material is madeup of iron ore powder, barites powder, sand, rosin, alcohol and gypsum powder. Iron ore powder,barites powder and sand are main materials, the solution of rosin and alcohol is glue, and gypsumpowder is regulator. Specimen mechanics tests show that different rock mass can be simulated bythe model materials with different materials compounding. The new similar material is easy tobuy and its price is cheap, and it has some advantages, such as high density, stable performance,easy dryness, and easy cutting. The new similar material can simulate a lot of rock mass, so it isan ideal similar material. At last, we apply this new type similar material to tunnelgeo-mechanical model test and gain the ideal result
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1801.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    On the Damage Evolution of 3-D Hydrous Cracks through CT Tests (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 13-18 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: By using the real-time CT (computerized tomography) unit with specially developed water-injection loading apparatus, several failure tests of single-crack concrete specimens with interstitial water pressures under triaxial compression were conducted. The complete failure process: the closure, the initiation of new damage area, the secondary closure, as well as the crack propagationof the specimens were simulated. The CT images at each stage, the CT numbers and the comparison among different sections in the specimens were obtained. Based on the observed results, the role of compressive pressure in damage and propagation of hydrous crack can be intuitively revealed, and the characteristics of damage-evolution of cracks in brittle material can be better understood atmeso-level
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.13.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fracture Strength Model for Jointed Rockmass and Its Application to Engineering (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1379-1384 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: There are large number of intermittently jointed cracks in rockmass, which exist inrockmass as a kind of initial damage. It is their damage, propagation and propagating interaction that result in a variety of failure forms of rockmass. This paper conducts an in depth research on the influence of cracks propagation interaction upon fracture strength of jointed rockmass. A kind of fracture strength model for jointed rockmass is developed under three-dimensional stress conditions. With the utilization of this model in a large-scale highway slope project, the design and construction are effectively performed and remarkable economic benefit has been achieved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1379.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Model of Damage Fracture and Damage Rheology for Jointed Rock Mass and Its Engineering Application (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1385-1390 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper puts forward a damage-fracture mechanical model and adamage-rheology mechanical model for the jointed rock mass of the high slopes in the ship lock area of Three Gorges Project. These two models are used to analyze the slopes’ stability. A comparison of the computed displacements at numbers of points on the slope surfaces with the results from 3-D analysis is also made. In addition, some computing results are compared with the in-situ measured ones, showing that the model proposed is basically reliable
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1385.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    A Three-Dimensional Numerical Model for Simulating Deformation and Failure of Blocky Rock Structures (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1391-1396 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents a three-dimensional numerical model for simulation of blocky rock structures based on static relaxation approach. The proposed method utilizes static equilibrium equations to calculate the displacements of blocks, compared to Newton’s second law applied by the traditional DEM. In order to obtain displacements simultaneously, the technique of global stiffnessmatrix is introduced in to form the global equilibrium equations. Because large displacements come from the accumulation of small displacement increments, an iteration procedure is adopted in the calculation. A C++ program is developed based on the proposed algorithm, and an illustrative example is computed for verification
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1391.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Humidity-Stress in Unsaturated Argillite Tunnel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1409-1414 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An extension of Hoek-Brown criteria to include unsaturated behavior of argillite inporous medium is presented. The model is applied to simulate evolution of saturation degree in argillite and concrete in an experimental tunnel where field investigation ofthermo-hydro-mechanical response of argillite and concrete will be done. Based on the laboratory experimental data, two different flow rules of water relative permeability and water saturation degree were suggested. The general evolution rules of saturation degree in argillite and concrete with time considering the effects ventilation are obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1409.pdf
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