Influence Factors of Borehole Shear Characteristics in Loess

YU Yong-tang; ZHU Jian-min; ZHENG Jian-guo; XU Wen-tao; ZHANG Long; HUANG Xiao-wei

doi:10.11988/ckyyb.20211247

PDF(4462 KB)

Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (4) : 100-106. DOI: 10.11988/ckyyb.20211247

ROCK SOIL ENGINEERING

Influence Factors of Borehole Shear Characteristics in Loess

YU Yong-tang^1,2, ZHU Jian-min², ZHENG Jian-guo^2,3, XU Wen-tao², ZHANG Long³, HUANG Xiao-wei³

Author information +

History +

Abstract

The borehole shear characteristics of typical Xi'an Q₃ loess were studied using an improved Iowa borehole shear apparatus to guide the application of borehole shear tests in loess areas. The study present the influence of normal stress range, loading shear mode, shear rate, and other factors on test results. The test results showed that when normal stress is controlled within the range of initial stress and critical plastic stress, shear strength and normal stress can be in good agreement with the Mohr-Coulomb failure criterion. When normal stress is less than the initial stress, cohesion is smaller or even negative, and internal friction angle is larger. When normal stress exceeds critical plastic stress, cohesion is larger and internal friction angle is smaller. There is no significant difference in shear strength parameters between single-stage testing and multi-stage testing. When the loess is consolidated at first-stage normal stress for 10 minutes and graded stages for 5 minutes, the normal displacement rate is less than 0.005 mm/min, which can be used as a basis for determining the stability of consolidation deformation. When shear rate is in the range of 1.7-2.3 r/s, the difference between test results of shear strength index is small. The test results of factors affecting shear characteristics of boreholes can be used as a reference for test manipulation and data processing.

Key words

loess / borehole shear test / shear characteristics / shear strength parameters / normal stress

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

YU Yong-tang, ZHU Jian-min, ZHENG Jian-guo, XU Wen-tao, ZHANG Long, HUANG Xiao-wei. Influence Factors of Borehole Shear Characteristics in Loess[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(4): 100-106 https://doi.org/10.11988/ckyyb.20211247

References

[1] 吴益平, 卢里尔, 薛阳. 基于临界状态的边坡渐进破坏力学模型分析及应用. 地质科技通报, 2020, 39(5): 1-7.
[2] 侯超群, 石恭泽, 孙志彬, 等. 基于滑移线理论的非饱和土条形地基承载力计算. 长江科学院院报, 2020, 37(6): 141-146, 152.
[3] 曹海莹, 刘杰锋, 武崇福, 等. 非极限状态主动土压力与填土张拉裂缝研究. 中国公路学报, 2020, 33(1): 51-61, 78.
[4] 陈志辉. 土体原位测试技术新进展. 中国水运(下半月), 2011, 11(6): 100-101.
[5] 相兴华. 基坑开挖与降水对支护结构受力及地面变形影响的研究. 太原: 太原理工大学, 2013.
[6] 沈珠江. 原状取土还是原位测试: 土质参数测试技术发展方向刍议. 岩土工程学报, 1996, 18(5): 90-91.
[7] HANDY R L, FOX N S. A Soil Bore-hole Direct Shear Test Device. Transportation Research Record, 1967, 27: 42-51.
[8] DRNEVICH V P, LUTENEGGER A J, DA T. Reproducibility of Borehole Shear Test Results in Marine Clay. Geotechnical Testing Journal, 1987, 10(1): 13-18.
[9] LUTENEGGER A J, REMMES B D, HANDY R L. Borehole Shear Test for Stiff Soil. Journal of the Geotechnical Engineering Division, 1978, 104(11): 1403-1407.
[10] LUTENEGGER A, ADAMS M. Tension Tests on Bored Piles in Residual Soil. Geotechnical Special Publication, 1999, 92: 43-53.
[11] SBROGLIA R M, HIGASHI R A R, ESPNDOLA M S, et al. Use of Borehole Shear Test to Obtain Shear Strength Data Comparison to Direct Shear Test//Shakoor A, Cato K. IAEG/AEG Annual Meeting Proceedings, San Francisco, California, 2018—Volume 6. Cham: Springer, 2019: 145-151.
[12] SAKAMOTO M Y,GUESSER L H,CONTESSI R J,et al. Use of a Borehole Shear Test Method for Geotechnical Mapping of Landslide Risk Areas//Landslides and Engineered Slopes. Experience, Theory and Practice. Boca Raton: CRC Press, 2018: 1783-1790.
[13] XIAO S, SULEIMAN M T, ELZEINY R, et al. Effect of Temperature and Radial Displacement Cycles on Soil-Concrete Interface Properties Using Modified Thermal Borehole Shear Test. Journal of Geotechnical and Geoenvironmental Engineering, 2018, 144(7): 1-13.
[14] ABDELSALAM S S, SULEIMAN M T, SRITHARAN S. Enhanced Load-Transfer Analysis for Friction Piles Using a Modified Borehole Shear Test. Geotechnical Testing Journal, 2012, 35(6): 20120071.
[15] DRNEVICH V P, ASTM S S D. Suggested Method for Performing the Borehole Shear Test. Geotechnical Testing Journal, 1987, 10(1): 19-25.
[16] 化建新, 郑建国. 工程地质手册. 5版. 北京: 中国建筑工业出版社, 2018:282-284.
[17] 于永堂, 张龙, 郑建国, 等. 重塑黄土的钻孔剪切变形与强度特性研究. 岩石力学与工程学报, 2021, 40(增刊2): 3367-3378.
[18] 石熊, 张家生, 刘蓓, 等. 土-混凝土接触面剪切破坏模式分析. 铁道科学与工程学报, 2015, 12(4): 790-794.
[19] 于永堂,郑建国,刘争宏,等. 钻孔剪切试验及其在黄土中的应用. 岩土力学,2016,37(12):3635-3641,3649.