Geomechanical Models

Fumagalli, Emanuele

doi:10.1007/978-3-7091-8317-5_7

Cited by 15 publications

(20 citation statements)

References 4 publications

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“…The basic analogy criteria for linear elastic problems deduced from equilibrium, geometric, physical and boundary condition equations (Fumagalli 1979) are:…”

Section: Similarity Relationmentioning

confidence: 99%

A physical simulation test for the rockburst in tunnels

Wang

Meng

2011

J. Mt. Sci.

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According to the test results of the physical and mechanical properties of similar materials in various quality mixture, a type of material with obvious tendency of rockburst was selected to produce a large-size model to simulate rockburst phenomena in tunnels. The prototype model comes from a typical section of diversion tunnels in Jinping Hydropower Station in China. The simulation of excavating tunnels is carried out by opening a hole in the model after loading. The modeling results indicated that under the condition of normal stresses in the model boundaries the arch top, spandrel and side walls of the tunnel produced an obvious jump reaction of stress and strain and the acoustic emission counts of the surrounding rock also increased rapidly in a different time period after the "tunnel" excavation, showing the clear features of rockburst. The spalling, buckling and breaking occurred in the surrounding rock of model in conditions of over loading. It is concluded that the modeling tunnel segment in Jinping Hydropower Station is expected to form the tensile rockburst with the pattern of spalling, buckling and breaking.

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“…The basic analogy criteria for linear elastic problems deduced from equilibrium, geometric, physical and boundary condition equations (Fumagalli 1979) are:…”

Section: Similarity Relationmentioning

confidence: 99%

A physical simulation test for the rockburst in tunnels

Wang

Meng

2011

J. Mt. Sci.

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“…The similar material and its prototype must comply with the similarity principle. The theory requires several similarity coefficients defined as ratios of prototype parameters to model parameters to be constant (Fumagalli) [28, 30]:

\begin{matrix} C_{σ} = C_{γ} C_{L}, \end{matrix}

\begin{matrix} C_{δ} = C_{ε} C_{L}, \end{matrix}

\begin{matrix} C_{σ} = C_{ε} C_{E}, \end{matrix}

\begin{matrix} C_{ε} = 1, C_{f} = 1, \end{matrix}

where C σ , C ε , C E , C L , C γ , C f , C ϕ , and C μ indicate the similarity ratios of stress, strain, MOE, geometry, volume weight, COF, internal friction angle, and passion ratio, respectively.…”

Section: Similarity Theory and Analogical Materialsmentioning

confidence: 99%

“…There are several Institutes researching on the similar material, such as ISMES (Institute of Experimental Models and Structures) in Italy, LNEC (National Laboratory for Civil Engineering) in Portugal, and Tsinghua University in China [30, 31]. Their work shows that whether the model test can reflect the prototype engineering's mechanical response depends on the chosen materials.…”

Section: Similarity Theory and Analogical Materialsmentioning

confidence: 99%

Model Test of Anchoring Effect on Zonal Disintegration in Deep Surrounding Rock Masses

Chen

Zhang

Wang

et al. 2013

The Scientific World Journal

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The deep rock masses show a different mechanical behavior compared with the shallow rock masses. They are classified into alternating fractured and intact zones during the excavation, which is known as zonal disintegration. Such phenomenon is a great disaster and will induce the different excavation and anchoring methodology. In this study, a 3D geomechanics model test was conducted to research the anchoring effect of zonal disintegration. The model was constructed with anchoring in a half and nonanchoring in the other half, to compare with each other. The optical extensometer and optical sensor were adopted to measure the displacement and strain changing law in the model test. The displacement laws of the deep surrounding rocks were obtained and found to be nonmonotonic versus the distance to the periphery. Zonal disintegration occurs in the area without anchoring and did not occur in the model under anchoring condition. By contrasting the phenomenon, the anchor effect of restraining zonal disintegration was revealed. And the formation condition of zonal disintegration was decided. In the procedure of tunnel excavation, the anchor strain was found to be alternation in tension and compression. It indicates that anchor will show the nonmonotonic law during suppressing the zonal disintegration.

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“…Analogue materials research started in Europe. In the 1960s, Fumagalli [8] pioneered techniques for geomechanical model tests in the Experimental Institute for Models and Structures (ISMES). They developed analogue materials which used gypsum as a binder and lead oxide powder and bentonite clay as filler materials.…”

Section: Introductionmentioning

confidence: 99%

“…Indraratna [11] presented a synthetic material to simulate soft sedimentary rocks and it was constituted with gypsum cement, fine sand, and water. Glushinkhin et al [12] developed a series of analogue materials and applied them in model tests of zonal disintegration in deep rock masses, Figure 1: Classification of analogue materials for rock [8].…”

Section: Introductionmentioning

confidence: 99%

Sodium Metasilicate Cemented Analogue Material and Its Mechanical Properties

Yue

Qiu

Fan

et al. 2016

Advances in Materials Science and Engineering

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Analogue material with appropriate properties is of great importance to the reliability of geomechanical model test, which is one of the mostly used approaches in field of geotechnical research. In this paper, a new type of analogue material is developed, which is composed of coarse aggregate (quartz sand and/or barite sand), fine aggregate (barite powder), and cementitious material (anhydrous sodium silicate). The components of each raw material are the key influencing factors, which significantly affect the physical and mechanical parameters of analogue materials. In order to establish the relationship between parameters and factors, the material properties including density, Young’s modulus, uniaxial compressive strength, and tensile strength were investigated by a series of orthogonal experiments with hundreds of samples. By orthogonal regression analysis, the regression equations of each parameter were obtained based on experimental data, which can predict the properties of the developed analogue materials according to proportions. The experiments and applications indicate that sodium metasilicate cemented analogue material is a type of low-strength and low-modulus material with designable density, which is insensitive to humidity and temperature and satisfies mechanical scaling criteria for weak rock or soft geological materials. Moreover, the developed material can be easily cast into structures with complex geometry shapes and simulate the deformation and failure processes of prototype rocks.

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Geomechanical Models

Cited by 15 publications

References 4 publications

A physical simulation test for the rockburst in tunnels

A physical simulation test for the rockburst in tunnels

Model Test of Anchoring Effect on Zonal Disintegration in Deep Surrounding Rock Masses

Sodium Metasilicate Cemented Analogue Material and Its Mechanical Properties

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