Research on Similar Materials for Rheological Test of Hard Rock Mass

Abstract:

The analog material, used in the Geo-mechanical model test that is designed to study the unloading rheological behavior and failure characteristics of rock mass, must reflect the physico-mechanical behaviors of the actual rock mass. The surrounding rock of Meng-di-gou hydropower station is in complex geological conditions. With the excavation of the rock mass, the surrounding rock gradually unloading, and the property of the near rock mass. It is necessary to carry out Geo-mechanical model test to study the rheological properties of deep rock mass under complicated geological conditions. So the similar material, comprised of iron powder, barite powder, and quartz sands bound with a solution of alcohol and colophonium, is suggested to be improvable. Firstly, through more than 300 groups of mix proportion tests, the influence of different mix proportions of the ingredients are analyzed to obtain the optimal analog materials; Secondly, more than 1200 specimens are made into size Φ50mm×100mm; Lastly, physico-mechanical tests were conducted by using the specimens to test the mechanical property of the similar material, and the basic physico-mechanical parameters are obtained from the analog material. The results indicates that the property of the similar material matches well with that of the rock mass in site, so the similar material is suitable for the Geo-mechanical model test, and it can be used to test the unloading rheological behavior of rock mass of Meng-di-gou hydropower station.

• Periodical: Key Engineering Materials (Volume 744)
• Pages: 169-173
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.744.169
• Online since: July 2017
• Authors: Long Yun Zhang, Shang Yang Yang*
• Keywords: Geo-Mechanical Model, Physico-Mechanical Test, Rheological Test, Similar Material

References

[1] S. G. Du, M. Huang, Z. Y. Luo, et al. Similar Material Study of Mechanical Prototype Test of Rock Structural Plane. Chinese J. Rock Mech. Eng. 29(11) (2010) 2263-2270.

[2] B. F. Li, Y. K. Ren, L. W. Qi, et al. Study On Orthogonal Mixing Rate Experiment With Low Strength Similar Material of Coal and Rock Mass. Coal Eng. 4 (2011) 93-95.

[3] B. L. Han, X. L. Chen, Y. L. Song, Research on similar material of rock mass. J. Wuhan Univ. Hydr. Electr. Eng. 30 (1997) 6–9.

[4] F. P. Ma, Z. K. Li, G. F. Luo, NIOS model material and its use in geo-mechanical similarity model test. J. Hydroelectr. Eng. 23 (2004) 48–51.

[5] T. Kawamoto, Macroscopic shear failure of jointed and layered brittle media. Proceedings of the 2nd Congress of International Society for Rock Mechanics, Belgrade, Sept. 21-26, (1970), pp.215-221.

[6] X. M. Liu, Q. Sheng, J. Chen, et al. Seismic shaking table test for large-scale underground cavern group (I): Proportioning test on similar materials of surrounding rock. Rock. Soil. Mech. 23(1) (2015) 83-88.

[7] X. Yang, D. L. Su, B. Zhou, et al. Experiment study on similarity ratio of similar material for model test on red-bed soft rock. Rock. Soil. Mech. 37(8) (2016) 2231-2237.

[8] H. F. Lin, Y. L. Zhai, S. G. Li, et al. Research on mechanics and permeability characteristics of similar material of solid-gas coupling based on orthogonal design. J. China Coal Soc. 41(3) (2016) 672-679.

[9] Y. Y. Wang, Y. M. Zhu, X. Y. Fan, et al. The experimental study on the damage influence of the porosity on shale similar material. Chinese J. Appl. Mech. 33(4) (2016) 695-700.

[10] X. Guo, P. He, K. Zhu, et al. Model test research of similar materials for underwater tunnel lining in fluid-solid two-phase field. Chinese J. Rock Mech. Eng. 35(S2) (2016) 3774-3784.