Influence of lateral pressure on mechanical behavior of different rock types under biaxial compression

Abstract

Lots of field investigations have proven that layer-crack structure usually appears during the excavation process of deep rock or coal mass. To provide experimental data for studying the formation mechanism of layer-crack structure, this study researches the influence of lateral pressure on the mechanical behavior of different rock types. Four rock types have been tested and the formation mechanism of macro-fracture surface is analyzed. Results indicate that the brittleness and burst proneness of rock or coal material are stronger than that of gypsum material due to the different mineral compositions and structures. When the lateral pressure is less than 10% uniaxial strength, the peak stress and elastic modulus increase with the increase of lateral pressure; but when the lateral pressure is larger than 10% uniaxial strength, the two parameters decrease slightly or keep steady. This is because when the lateral pressure reaches a certain value, local failure will be formed during the process of applying lateral pressure. Under the condition of low lateral pressure, the failure of the specimen is dominated by the tensile mechanism; under the condition of relatively high lateral pressure, the area of the specimen close to the free surface is tensile splitting failure, and the area far from the free surface is shear failure.

Keywords

layer-crack structure / slabbing / spalling / biaxial compression / lateral pressure / failure mechanism

References

[1] GuoW-Y, ZhaoT-B, TanY-L, et al. . Progressive mitigation method of rock bursts under complicated geological conditions [J]. International Journal of Rock Mechanics and Mining Sciences, 2017, 96: 11-22

[2] GuoW-Y, TanY-L, YuF-H, et al. . Mechanical behavior of rock-coal-rock specimens with different coal thicknesses [J]. Geomechanics and Engineering, 2018, 15: 1017-1027

[3] YouW, DaiF, LiuY, et al. . Investigation of the influence of intermediate principal stress on the dynamic responses of rocks subjected to true triaxial stress state [J]. International Journal of Mining Science and Technology, 2021, 31(5): 913-926

[4] YouW, DaiF, LiuY, et al. . Effect of confining pressure and strain rate on mechanical behaviors and failure characteristics of sandstone containing a pre-existing flaw [J]. Rock Mechanics and Rock Engineering, 2022, 55(4): 2091-2109

[5] ChenS-W, LiangF, ZuoS-Y, et al. . Evolution of deformation property and strength component mobilization for thermally treated Beishan granite under compression [J]. Journal of Central South University, 2021, 28(1): 219-234

[6] LiuY, DaiF, PeiP-D. A wing-crack extension model for tensile response of saturated rocks under coupled static-dynamic loading [J]. International Journal of Rock Mechanics and Mining Sciences, 2021, 146: 104893

[7] MartiniC D, ReadR S, MartinoJ B. Observations of brittle failure around a circular test tunnel [J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(7): 1065-1073

[8] HajiabdolmajidV, KaiserP. Brittleness of rock and stability assessment in hard rock tunneling [J]. Tunnelling and Underground Space Technology, 2003, 18(1): 35-48

[9] LiX, KonietzkyH. Numerical simulation schemes for time-dependent crack growth in hard brittle rock [J]. Acta Geotechnica, 2015, 10(4): 513-531

[10] GongF-Q, WangY-L, WangZ-G, et al. . A new criterion of coal burst proneness based on the residual elastic energy index [J]. International Journal of Mining Science and Technology, 2021, 31(4): 553-563

[11] MarkC, GaunaM. Pillar design and coal burst experience in Utah Book Cliffs longwall operations [J]. International Journal of Mining Science and Technology, 2021, 31(1): 33-41

[12] DuH-B, DaiF, XuY, et al. . Numerical investigation on the dynamic strength and failure behavior of rocks under hydrostatic confinement in SHPB testing [J]. International Journal of Rock Mechanics and Mining Sciences, 2018, 10843-57

[13] LiuP-F, ZhouX-P, QianQ-H. Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete [J]. International Journal of Mining Science and Technology, 2021, 31(5): 939-951

[14] FengJ-J, WangE-Y, HuangQ-S, et al. . Experimental and numerical study of failure behavior and mechanism of coal under dynamic compressive loads [J]. International Journal of Mining Science and Technology, 2020, 30(5): 613-621

[15] HeX-H, ZuoT-H, ZouY-F, et al. . Experimental study on aerodynamic characteristics of a high-speed train on viaducts in turbulent crosswinds [J]. Journal of Central South University, 2020, 27(8): 2465-2478

[16] DowdingC H, AnderssonC A. Potential for rock bursting and slabbing in deep Caverns [J]. Engineering Geology, 1986, 22(3): 265-279

[17] WeiM-D, DaiF, LiuY, et al. . Influences of loading method and Notch type on rock fracture toughness measurements: From the perspectives of T-stress and fracture process zone [J]. Rock Mechanics and Rock Engineering, 2021, 54(9): 4965-4986

[18] XuW-B, LiuB, WuW L. Strength and deformation behaviors of cemented tailings backfill under triaxial compression [J]. Journal of Central South University, 2020, 27(12): 3531-3543

[19] ZhangR, LongM-X, LanT, et al. . Stability analysis method of geogrid reinforced expansive soil slopes and its engineering application [J]. Journal of Central South University, 2020, 27(7): 1965-1980

[20] ZHOU Hui, XU Rong-chao, LU Jing-jing, et al. Study on mechanisms and physical simulation experiment of slab buckling rockburst in deep tunnel [J]. Chinese Journal of Rock Mechanics and Engineering, 2015(S2): 3658–3666.

[21] LiD-Y, LiC C, LiX-B. Influence of sample height-to-width ratios on failure mode for rectangular prism samples of hard rock loaded in uniaxial compression [J]. Rock Mechanics and Rock Engineering, 2011, 44(3): 253-267

[22] WuS-Y, GongQ-M, WangG, et al. . Experimental study of slabbing failure for deepburied marble at Jinping II Hydropower Station and its influences on TBM excavation [J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(6): 1089-1095

[23] GongQ M, YinL J, WuS Y, et al. . Rock burst and slabbing failure and its influence on TBM excavation at headrace tunnels in Jinping II hydropower station [J]. Engineering Geology, 2012, 124: 98-108

[24] ZhuW-S, YangW-M, XiangL, et al. . Laboratory and field study of splitting failure on side wall of large-scale cavern and feedback analysis [J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(7): 1310-1317(in Chinese)

[25] SuG-S, ZhaiS-B, JiangJ-Q, et al. . Influence of radial stress gradient on strainbursts: An experimental study [J]. Rock Mechanics and Rock Engineering, 2017, 50(10): 2659-2676

[26] HUANG Qing-xiang, GAO Zhao-ning. Mechanical model of fracture and damage of coal bump in the entry [J]. Journal of China Coal Society, 2001(2): 156–159.

[27] GermanovichL N, DyskinA V. Fracture mechanisms and instability of openings in compression [J]. International Journal of Rock Mechanics and Mining Sciences, 2000, 37(1–2): 263-284

[28] SahouryehE, DyskinA V, GermanovichL N. Crack growth under biaxial compression [J]. Engineering Fracture Mechanics, 2002, 69(18): 2187-2198

[29] ZhangC, ZhouH, FengX, et al. . Layered fractures induced by principal stress axes rotation in hard rock during tunnelling [J]. Materials Research Innovations, 2011, 15(sup1): s527-s530

[30] JIN Hong-wei, HU Qian-ting, LIU Yan-bao, et al. Mechanism research on the spall fracture phenomenon in outburst and coal bump [J]. Journal of Mining & Safety Engineering, 2012(5): 694–699.

[31] CaiM, KaiserP K. In-situ rock spalling strength near excavation boundaries [J]. Rock Mechanics and Rock Engineering, 2014, 47(2): 659-675

[32] CaiM. Influence of intermediate principal stress on rock fracturing and strength near excavation boundaries—Insight from numerical modeling [J]. International Journal of Rock Mechanics and Mining Sciences, 2008, 45(5): 763-772

[33] ZhaoT-B, GuoW-Y, TanY-L, et al. . Case studies of rock bursts under complicated geological conditions during multi-seam mining at a depth of 800 m [J]. Rock Mechanics and Rock Engineering, 2018, 51(5): 1539-1564

[34] ZhaoT-B, XingM-L, GuoW-Y, et al. . Anchoring effect and energy-absorbing support mechanism of large deformation bolt [J]. Journal of Central South University, 2021, 28(2): 572-581

[35] ZHOU Hui, MENG Fan-zhen, LIU Hai-tao, et al. Experimental study on characteristics and mechanism of brittle failure of granite [J]. Chinese Journal of Rock Mechanics and Engineering, 2014(9): 1822–1827.

[36] PanP-Z, FengX-T, HudsonJ A. The influence of the intermediate principal stress on rock failure behaviour: A numerical study [J]. Engineering Geology, 2012, 124: 109-118

[37] YinY-C, ZhaoT-B, TanY-L, et al. . Reconstruction and numerical test of the mesoscopic model of rock based on Otsu digital image processing [J]. Rock and Soil Mechanics, 2015, 36(9): 2532-2539(in Chinese)

[38] GuoW-Y, YuF-H, TanY-L, et al. . Experimental study on the failure mechanism of layer-crack structure [J]. Energy Science & Engineering, 2019, 7(6): 2351-2372