Interaction between transverse isotropy rock slope and supporting structure

Abstract

In order to study the interaction between transverse isotropy rock mass and supporting structure, the laboratory tests for rock sampled from the slope at expressway project were carried out, and the parameters of elasticity for transverse isotropic rock were determined by the uniaxial compression tests for rock sample with different strike of stratification plane. Then, based on the relationship of stress—stain for transverse isotropic rock mass, the analytical model was established for the interaction between transverse isotropic rock mass and frame beam with pre-stressed anchor cable. Furthermore, the conception of the best anchorage-angle in pre-stressed anchor cable was proposed. At last, the parameters of the interaction between transverse isotropy rock mass and frame beam with pre-stressed anchor cable were investigated by finite element method, and the best anchorage-angle in pre-stressed anchor cable was obtained. The rules of the influence of the directivity of stratification plane on supporting structure were determined. The results show that the analytical model and numerical method on the design of pre-stressed anchor cable with frame beam supporting for transverse isotropy rock slope are reasonable and reliable in practical engineering design.

Keywords

rock mechanics / transverse isotropy / pre-stressed anchor cable / frame beam / finite element analysis / anchorage angle

References

[1] ChenC. S., PanE., AmadeiB.. Determination of deformability and tensile strength of anisotropic rock using brazilian tests [J]. International Journal of Rock Mechanics and Mining Sciences, 1998, 35(1): 43-61

[2] ChenH.-k., TangH.-mei.. Visualization research on anisotropy of rock mass in rock project — Taking the slope engineering of permanent shiplocks of the Three Gorges Project as an example [J]. Journal of Chongqing Jiaotong Institute, 2000, 19(1): 92-97

[3] XIA Xiong, ZHOU De-pei. Application for prestressed anchor rope and frame beam-on-foundation on the slope stability [J]. Subgrade Engineering, 2006(2): 68–70. (in Chinese)

[4] LiangY., ZhouD.-p., ZhaoG.. Design of support of frame beam and prestressed anchor [J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(2): 318-322

[5] LekhnitskiiS. G.Theory of elasticity on an anisotropic rock [M], 1981, Moscow, Mir Publishers

[6] AmadeiB.. Importance of anisotropy when estimating and measuring in situ stresses in rock [J]. Int J Rock Mech Min Sci and Geomech Abstr, 1996, 33(3): 293-325

[7] MilouL.Rock mechanics [M], 1981, Beijing, China Coal Industry Publishing House

[8] KulatilakeP. H. S. W., WuT. H., WathugalaD. N.. Probabilistic modeling of joint orientation [J]. International Journal for Numerical and Analytical Methods in Geomechanic, 1990, 14(5): 325-350

[9] HOOPER J A. Elastic settlement of a transversely isotropic continuum with surface loading over a polygonal region [C]// Proceedings of the Institution of Civil Engineers. London, 1985: 247–273.

[10] HunerD. F. C.. Deformability of joints and its relation to rock foundation settlement [J]. Candadian Center for Mineral and Energy Technology, 1978, 15(2): 239-249

[11] ZhuB.-l., YangM., HuH.-t., ChenQ.. Testing study on internal forces for prestressed anchor cable frame in reinforced soil slope [J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(4): 697-702

[12] DengT., YangL.-de.. Characteristics of velocity ratio of p-wave and s-wave for anisotropic rock [J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(10): 2023-2029

[13] XuY.-z., TangH.-ming.. Design of compound structure of lattice frame beam and prestressed anchor [J]. Journal of Central South Highway Engineering, 2004, 29(6): 1-4

[14] XiongW.-l., HeZ.-g., ChenS.-hong.. Optimum design of direction angle of prestressed anchor cable in slope reinforcement [J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(13): 2260-2266

[15] LiQ.Application to ANSYS in civil engineering [M], 2005, Beijing, People’s Posts and Telecom Press

[16] HAO Wen-hua. Application insta

[17] nces of ANSYS in civil engineering [M]. Beijing: China Water Power Press, 2005. (in Chinese)

[18] HuQ., LinD.-s., ChenY.-ming.. Theoretical study on pile-soil homogeneous transversely isotropic model [J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(4): 853-859