Failure mechanism and stability analysis method of the Xiyu conglomerate slope

WANG Yujie; SUN Ping; LI Wenxin; ZHANG Qiang

doi:10.16511/j.cnki.qhdxxb.2021.21.028

PDF(29386 KB)

Journal of Tsinghua University(Science and Technology) ›› 2021, Vol. 61 ›› Issue (8) : 863-872. DOI: 10.16511/j.cnki.qhdxxb.2021.21.028

Engineering Application

Failure mechanism and stability analysis method of the Xiyu conglomerate slope

{{article.zuoZhe_EN}}

Author information +

History +

Abstract

Because the Xiyu conglomerate slope is commonly encountered in the construction of hydraulic projects in Xinjiang, its specific deformation characteristics and failure mechanism were studied through field investigation and discrete element method (DEM) numerical simulation analysis. A stability analysis method that is compatible with the deformation and failure mechanism was proposed according to force and moment balance analysis. The influence of erosion and crack depths on slope stability was analyzed. Results indicate that the failure process of the Xiyu conglomerate slope generally shows the characteristic of "slope toe erosion-tension crack at crown-staggered collapse." This can be divided into four evolutionary stages:slope toe erosion, local collapse, local collapse aggravated, and vertical tension crack formation. As the erosion or crack depth increases, the dumping safety factor of the slope decreases.

Key words

Xiyu conglomerate / slope stability / slope toe erosion / failure mechanism / discrete element method (DEM)

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

WANG Yujie, SUN Ping, LI Wenxin, ZHANG Qiang. Failure mechanism and stability analysis method of the Xiyu conglomerate slope[J]. Journal of Tsinghua University(Science and Technology). 2021, 61(8): 863-872 https://doi.org/10.16511/j.cnki.qhdxxb.2021.21.028

References

[1] 李冰晶, 武登云, 逄立臣, 等. 西域砾岩的地层属性与成因:进展与展望[J]. 地球环境学报, 2019, 10(5):427-440. LI B J, WU D Y, PANG L C, et al. Stratigraphic attribute and origin of the Xiyu conglomerates in NW China:Progress and prospect[J]. Journal of Earth Environment, 2019, 10(5):427-440. (in Chinese)
[2] 樊海柱. 西域砾岩结构特性及力学特性的试验研究[D]. 北京:北京交通大学, 2016. FAN H Z. Test research on structure and mechanical characteristics of conglomerate[D]. Beijing:Beijing Jiaotong University, 2016. (in Chinese)
[3] 田巍巍, 陈洁, 吴彬. 西域组钙质胶结砾岩物质构成试验研究[J].水利水电技术, 2018, 49(12):185-193. TIAN W W, CHEN J, WU B. Experimental study on material composition of Xiyu Formation calcareous cementitious conglomerate[J]. Water Resources and Hydropower Engineering, 2018, 49(12):185-193. (in Chinese)
[4] 张敬东, 陈朝红. 新疆西域组砾岩的工程地质特性[J]. 中国水运, 2013, 13(7):244-246. ZHANG J D, CHEN C H. Engineering geological characteristics of conglomerate in Xiyu Formation of Xinjiang[J]. China Water Transport, 2013, 13(7):244-246. (in Chinese)
[5] 陈祖煜, 汪小刚, 杨健, 等. 岩质边坡稳定分析:原理·方法·程序[M]. 北京:中国水利水电出版社, 2005. CHEN Z Y, WANG X G, YANG J, et al. Rock slope stability analysis:Theory, methods and programs[M]. Beijing:China Water Power Press, 2005. (in Chinese)
[6] 黎康平, 王玉杰, 李守义, 等. 西域砾岩高边坡坡脚侵蚀的破坏机理研究[J]. 水利水电技术, 2017, 48(12):184-190. LI K P, WANG Y J, LI S Y, et al. Study on failure mechanism of toe erosion of high Xiyu conglomerate slope[J]. Water Resources and Hydropower Engineering, 2017, 48(12):184-190. (in Chinese)
[7] 秦学林. 西域砾岩高边坡坡脚软岩软化的破坏机理模拟研究[J]. 中国水运, 2019, 19(8):258-259. QIN X L. Simulation study on failure mechanism of softening of soft rock at the foot of high conglomerate slope in western region[J]. China Water Transport, 2019, 19(8):258-259. (in Chinese)