Macro-and-microscopic Analysis of Shear Strain Zone of Reinforced Tailings Based on Partical Flow Code

YI Fu; JIN Hong-song; YU Hui-ze; DU Chang-bo; YU Ben

doi:10.11988/ckyyb.20201335

PDF(4876 KB)

Journal of Changjiang River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (4) : 116-121. DOI: 10.11988/ckyyb.20201335

ROCK SOIL ENGINEERING

Macro-and-microscopic Analysis of Shear Strain Zone of Reinforced Tailings Based on Partical Flow Code

YI Fu¹, JIN Hong-song², YU Hui-ze³, DU Chang-bo², YU Ben²

Author information +

History +

Abstract

The aim of this research is to enhance the overall stability of tailings dam by identifying the influence range of shear zone of geogrid-reinforced tailings dam. The influence law of shear strain zone was analyzed from macro-and-microscopic perspectives via indoor direct shear tests of tailings sand with varied moisture contents under different overlying loads. Results unveiled that: the test displacement of geogrid-reinforced tailings increased approximately linearly with the peak displacement ranging between 20 mm and 25 mm; overlying load presented a positive proportional relationship with peak shear displacement, and the growth rate of shear displacement gradually attenuated. The water content of tailings sand was 3%, 7%, 11% and 15%, respectively, and the density of tailings declined by 2.2%. With the growth of water content, the apparent cohesion gradually strengthened, and the interfacial friction angle first climbed and then dropped. Furthermore, partical flow code(PFC) model was established to accurately locate the area with large displacement change in the test chamber for meso-scale non-punctuation measurement analysis. The influence distance of shear strain zone reduced with the increase of water content of tailings sand, and such reduction alleviated gradually.

Key words

geogrid / reinforced tailings dam / direct shear test / PFC discrete element / shear strain zone

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

YI Fu, JIN Hong-song, YU Hui-ze, DU Chang-bo, YU Ben. Macro-and-microscopic Analysis of Shear Strain Zone of Reinforced Tailings Based on Partical Flow Code[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(4): 116-121 https://doi.org/10.11988/ckyyb.20201335

References

[1] VIDAL H. The Principle of Reinforced Earth[R]. Washington D.C.: Highway Research Record, 1969.
[2] LESHCHINSKY B, LING H. Effects of Geocell Confinement on Strength and Deformation Behavior of Gravel[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139(2): 340-352.
[3] SAYÃO A S F J, BECKER L B. Behavior of a Geogrid Reinforced Soil Wall Built with Clayey Silt[C] //Proceedings of the 9th International Conference on Geosynthetics. Brazil, May 23-27, 2010: 1685-1688.
[4] COSTA C M L, ZORNBERG J G, BUENO B S, et al. Centrifuge Evaluation of the Time-dependent Behavior of Geotextile-reinforced Soil Walls[J]. Geoextiles and Geomembranes, 2016, 44(2): 188-200.
[5] MORACI N, GIOFFRE D. A Simple Method to Evaluate the Pullout Resistance of Extruded Geogrids Embedded in a Compacted Granular Soil[J]. Geotextiles and Geomembranes, 2006, 24(2): 116-128.
[6] TAFRESHI S N M, DAWSON A R. Comparison of Bearing Capacity of a Strip Footing on Sand with Geocell and with Planar Forms of Geotextile Reinforcement[J]. Geotextiles and Geomembranes, 2010, 28(1): 72-84.
[7] LIAO X, YE G, XU C. Friction and Passive Resistance of Geogrid in Pullout Tests[J]. Advances in Ground Improvement, 2009, 188: 252-259.
[8] 赵晓龙,陆晓平,荣绍洋, 等. 土工布加筋粗颗粒土变形与强度特性试验研究[J]. 工程科学与技术, 2018, 50(6): 165-173.
[9] 张利阳, 易富, 李俊元,等. 土工织物加筋尾矿砂界面力学特性试验研究[J]. 长江科学院院报, 2020, 37(5): 145-150.
[10] 黄文彬, 陈晓平. 土工织物与吹填土界面作用特性试验研究[J]. 岩土力学, 2014, 35(10): 2831-2837.
[11] 刘飞禹,王攀,王军,等.不同剪切速率下格栅-土界面循环剪切及其后直剪特性[J].岩石力学与工程学报,2016,35(2):387-395.
[12] 杨鑫,崔宏环,张立群,等.砂土-结构接触面剪切特性大型直剪试验研究[J].铁道科学与工程学报,2019,16(5): 1672-7029.
[13] 郑俊杰,曹文昭,周燕君,等.三向土工格栅筋-土界面特性拉拔试验研究[J].岩土力学,2017,38(2):317-324.
[14] 朱顺然,徐超,丁金华.土工织物-砂土界面的叠环式剪切试验[J].岩土力学,2018,39(5):1775-1788.
[15] 傅克贤,李元,姜屏,等.纳米粘土的微观结构与直剪力学特性及应用研究[J].绍兴文理学院学报, 2019, 39(7):19-24.
[16] 朱品竹,蒋欢,秦政,等.静动力条件下尾矿库扩容稳定性分析[J].江西理工大学学报,2019,40(1):2095- 3046.
[17] 张超,马昌坤,杨春和,等.粒径对尾矿抗剪强度及坝体稳定性影响[J].岩土工程学报,2019, 41(增刊1):145-148.