• Indexed in Scopus
  • Source Journal for Chinese Scientific and Technical Papers and Citations
  • Included in A Guide to the Core Journal of China
  • Indexed in Ei Compendex
YANG Kaixuan, ZHAO Heng, ZHAO Minghua, JIA Wurong, HUA Xugang. Analytical solution for vertical load transfer of cast-in-place piles considering shear-induced volumetric contraction across shaft-rock joints[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(6): 1229-1238. DOI: 10.11779/CJGE20240112
Citation: YANG Kaixuan, ZHAO Heng, ZHAO Minghua, JIA Wurong, HUA Xugang. Analytical solution for vertical load transfer of cast-in-place piles considering shear-induced volumetric contraction across shaft-rock joints[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(6): 1229-1238. DOI: 10.11779/CJGE20240112

Analytical solution for vertical load transfer of cast-in-place piles considering shear-induced volumetric contraction across shaft-rock joints

More Information
  • Received Date: February 01, 2024
  • Available Online: June 18, 2024
  • In soft rock strata, the vertical load transfer behavior of cast-in-place piles is significantly influenced by the roughness of shaft-rock joints. It is particularly pronounced at the interface between the shaft and the surrounding rock, where dislocations occur under loads, leading to shear dilation and an increase in the lateral constraint (normal stress). The existing models, such as the Patton's model and its generalized form, can well predict the normal stress at the pre-peak, but they ignore a critical aspect: in specific, the potential destruction of the asperity when shear dilation reaches the critical state due to increasing local stress, leading to the rapid release of accumulated energy. This destruction is macroscopically represented as the volume shear contraction of the shaft-rock joints, causing a decrease in the normal stress. This study identifies that a newborn debris will be separated from the original rock asperity and obliquely slides after the asperity fails based on the upper-bound solution of a unilaterally compressed wedge and the existing laboratory observations. Considering the kinematic principles, the energy principle is used to determine the shear contraction angle and the sliding resistance at the post-peak. The modified shear model is verified using the observations of the existing direct shear tests. On this basis, the analytical solutions for the distribution of axial force are obtained. The parameter studies reveal that the half chord-length, shear dilation inclination and internal friction angle of rock have a strong impact on the shear contraction angle and unit shaft resistance.
  • [1]
    宋随弟, 彭雄志, 杨泉, 等. 超大直径嵌岩桩基础竖向受荷性状研究[J]. 铁道工程学报, 2023, 40(2): 41-46, 105.

    SONG Suidi, PENG Xiongzhi, YANG Quan, et al. Research on the characters of super-large diameter rock-socketed pile foundation under vertical load[J]. Journal of Railway Engineering Society, 2023, 40(2): 41-46, 105. (in Chinese)
    [2]
    何思明, 卢国胜. 嵌岩桩荷载传递特性研究[J]. 岩土力学, 2007, 28(12): 2598-2602. doi: 10.3969/j.issn.1000-7598.2007.12.022

    HE Siming, LU Guosheng. Study on load transfer characteristic of rock-socketed pole[J]. Rock and Soil Mechanics, 2007, 28(12): 2598-2602. (in Chinese) doi: 10.3969/j.issn.1000-7598.2007.12.022
    [3]
    刘松玉, 季鹏, 韦杰. 大直径泥质软岩嵌岩灌注桩的荷载传递性状[J]. 岩土工程学报, 1998, 20(4): 58-61. https://cge.nhri.cn/article/id/10164

    LIU Songyu, JI Peng, WEI Jie. Load transfer behavior of large diameter cast in place pile embedded in soft rock[J]. Chinese Journal of Geotechnical Engineering, 1998, 20(4): 58-61. (in Chinese) https://cge.nhri.cn/article/id/10164
    [4]
    梁晋渝, 史佩栋. 嵌岩桩竖向承载力的研究[J]. 岩土工程学报, 1994, 16(4): 32–39. https://cge.nhri.cn/article/id/9786

    LIANG Jinyu, SHI Peidong. Study of vertical bearing capacity of socketed piles[J]. Chinese Journal of Geotechnical Engineering, 1994, 16(4): 32–39. (in Chinese) https://cge.nhri.cn/article/id/9786
    [5]
    龚成中, 龚维明, 何春林, 等. 孔壁粗糙度对深嵌岩桩承载特性的影响[J]. 中国公路学报, 2011, 24(2): 56-61.

    GONG Chengzhong, GONG Weiming, HE Chunlin, et al. Influence of hole side roughness on bearing characteristic of deep rock-socketed pile[J]. China Journal of Highway and Transport, 2011, 24(2): 56-61. (in Chinese)
    [6]
    赵明华, 雷勇, 刘晓明. 基于桩-岩结构面特性的嵌岩桩荷载传递分析[J]. 岩石力学与工程学报, 2009, 28(1): 103-110.

    ZHAO Minghua, LEI Yong, LIU Xiaoming. Analysis of load transfer of rock-socketed piles based on characteristics of pile-rock structural plane[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(1): 103-110. (in Chinese)
    [7]
    邢皓枫, 孟明辉, 何文勇, 等. 基于结构面力学特性的嵌岩桩侧摩阻力分布分析[J]. 岩土工程学报, 2012, 34(12): 2220-2227. https://cge.nhri.cn/article/id/14953

    XING Haofeng, MENG Minghui, HE Wenyong, et al. Distribution of shaft resistance of rock-socketed piles based on mechanical properties of pile-rock interface[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(12): 2220-2227. (in Chinese) https://cge.nhri.cn/article/id/14953
    [8]
    JOHNSTON I W, LAM T S K. Shear behavior of regular triangular concrete/rock joints-analysis[J]. Journal of Geotechnical Engineering, 1989, 115(5): 711-727.
    [9]
    PATTON F D. Multiple modes of shear failure in rock[C]// Proceeding 1st Congress International Rock Mechanics, Lisbon, 1966: 509-513.
    [10]
    赵明华, 夏润炎, 尹平保, 等. 考虑软岩剪胀效应的嵌岩桩荷载传递机理分析[J]. 岩土工程学报, 2014, 36(6): 1005-1011. doi: 10.11779/CJGE201406003

    ZHAO Minghua, XIA Runyan, YIN Pingbao, et al. Load transfer mechanism of socketed piles considering shear dilation effects of soft rock[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(6): 1005-1011. (in Chinese) doi: 10.11779/CJGE201406003
    [11]
    ZHAO H, HOU J C, ZHANG L, et al. Towards concrete-rock interface shear containing similar triangular asperities[J]. International Journal of Rock Mechanics and Mining Sciences, 2021, 137: 104547.
    [12]
    赵衡, 侯继超, 赵明华. 岩石-混凝土结构面的广义Patton剪切模型[J]. 岩土工程学报, 2022, 44(11): 2106-2114. doi: 10.11779/CJGE202211017

    ZHAO Heng, HOU Jichao, ZHAO Minghua. Generalized Patton shear model for rock-concrete joints[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(11): 2106-2114. (in Chinese) doi: 10.11779/CJGE202211017
    [13]
    LIU Y N, ZHAO H, ZHAO M H, et al. Laboratory and theoretical study for concrete-mudstone interface shear to account for asperity degradation[J]. Environmental Earth Sciences, 2021, 81(1): 1-16.
    [14]
    YANG K X, HU Q, ZHAO H, et al. Numerical study on the shear behavior of concrete-rock joints with similar triangular asperities[J]. Computers and Geotechnics, 2023, 159: 105468.
    [15]
    SEIDEL J P, HABERFIELD C M. A theoretical model for rock joints subjected to constant normal stiffness direct shear[J]. International Journal of Rock Mechanics and Mining Sciences, 2002, 39(5): 539-553.
    [16]
    HOU J C, ZHAO H, PENG W Z, et al. A limit solution for predicting side resistance on rock-socketed piles[J]. Journal of Engineering Mechanics, 2022, 148(1): 04021131.
    [17]
    JOHNSTON I W, LAM T S K, WILLIAMS A F. Constant normal stiffness direct shear testing for socketed pile design in weak rock[J]. Géotechnique, 1987, 37(1): 83-89.
    [18]
    ZHAO H, XIAO Y, ZHAO M H, et al. On behavior of load transfer for drilled shafts embedded in weak rocks[J]. Computers and Geotechnics, 2017, 85: 177-185.
    [19]
    周韬, 王星华, 巢万里. 大直径嵌岩桩的承载性状[J]. 湖南交通科技, 2006, 32(4): 85-87.

    ZHOU Tao, WANG Xinghua, CHAO Wanli. Supporting capacity behavior of large diameter rock-socketed piles[J]. Hunan Communication Science and Technology, 2006, 32(4): 85-87. (in Chinese)
    [20]
    O'NEILL M W, TOWNSEND F C, HASSAN K M, et al. Load Transfer for Drilled Shafts in Intermediate Geomaterials[R]. HWA-RD-95-172, McLean, Va: Federal Highway Administration, 1996: 141-157.

Catalog

    Article views PDF downloads Cited by()
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return