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Secondly, Mohr-Coulomb strength criterion only applies to material of , in this formula, ,,, are material tensile strength, pressive strength, yield strength and shear strength.
Unified strength theory, which is created by professor Yu Maohong, can rationally reflect intermediate principal stress effect[18] and flexibly apply to various kinds of materials in engineering.
Liner material parameter =20000MPa, =0.167, =5MPa, .
Wall rock material parameter =2000MPa, =0.25, =1MPa, .
Acknowledgements This work reported herein is supported by the Science Foundation of Shaanxi Province (SJ08E204), the Natural Science Foundation of China (50908015).

Several hard materials were investigated as spray feedstocks.
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For example, Fig. 3 can be used to determine the minimum distance between the salt caverns, to find safe places for people to stay, and to identify proper areas for storing flammable and explosive materials.
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Materials and Equipments Wood residual fibers from aspen and larch, shattered into 60-80 mesh.
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Ultrasonic machining has been proven to be a promising machining method on hard and brittle materials.
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Thermal stress and mechanical properties of material can reduce natural frequencies;the flutter boundary will also change as changing of structural normal modes.
Take the 7075 aluminum alloy as the material object in this paper, the E and G varied as the changing of temperature in the Table 1.
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The work presents the research results of modern composite materials.
Additionally, hardness and tensile test was performed for acquired materials.
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Annealing Heat Treatment of ZnO Nanoparticles Grown on Porous Si Substrate Using Spin-Coating Method, Advances in Materials Science and Engineering, 2014 (2014) 6
Morphology and optical properties of zinc oxide thin films grown on Si (100) by metal-organic chemical vapor deposition, Journal of Materials Science: Materials in Electronics, 20 (S1) (2008) 441-445
Growth of ZnO Nanosturctures on Porous Silicon in Different Concentration of Zn2+ Ion, Advanced Materials Research, 832 (2014) 691-694
Microstructure and Materials Properties, 8 (6) (2013) 478-487
Surface Morphology of Seeded Nanostructured ZnO on Silicon by Sol-Gel Technique, Advanced Materials Research, 667 (2013) 265-271