Triaxial test for strength characteristics of saturated clay-structure interface based on prefabricated sliding surface

SU Xin-bin; LIAO Chen-cong; LIU Shi-ao; ZHANG Lu-lu

doi:10.16285/j.rsm.2021.2139

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Triaxial test for strength characteristics of saturated clay-structure interface based on prefabricated sliding surface

更新时间：2026-06-25

- Triaxial test for strength characteristics of saturated clay-structure interface based on prefabricated sliding surface
- Vol. 43, Issue 10, Pages: 2852-2860(2022)
- 作者机构：
  
  1. 上海交通大学海洋工程国家重点实验室,上海,200240
  2. 上海交通大学船舶海洋与建筑工程学院,上海,200240
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.2139
  CLC： TU41
- Online First：18 October 2022，
  
  Published：2022
- 稿件说明：
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SU Xin-bin, LIAO Chen-cong, LIU Shi-ao, et al. Triaxial test for strength characteristics of saturated clay-structure interface based on prefabricated sliding surface[J]. 2022, 43(10): 2852-2860.
DOI：

SU Xin-bin, LIAO Chen-cong, LIU Shi-ao, et al. Triaxial test for strength characteristics of saturated clay-structure interface based on prefabricated sliding surface[J]. 2022, 43(10): 2852-2860. DOI： 10.16285/j.rsm.2021.2139.

摘要

通过预制含一定倾角、钻孔的斜截面结构物与饱和黏土结合为三轴组合试样，并使用三轴仪测量出饱和黏土与结构物界面的抗剪强度和超孔隙水压力，分析了饱和黏土与结构物界面的强度特性。相比传统界面直剪试验无法区分界面强度特性的剪切速率效应和排水状态效应，该试验方法可以使饱和黏土与结构物界面充分饱和并严格控制界面排水状态，明确剪切速率对界面强度的影响。开展了不同结构面粗糙度和剪切速率的界面三轴固结不排水剪切试验与不同剪切速率的界面直剪试验。试验结果表明：相同围压下随着结构面粗糙程度增大，界面抗剪强度和超孔隙水压力增大；剪切速率越快，界面抗剪强度越大，界面超孔隙水压力达到稳定所需要的轴向应变越大。排水条件的严格控制和界面超孔隙水压力的准确量测对饱和黏土与结构物界面摩擦角的测量十分重要。

Abstract

The strength characteristics of the interface between saturated clay and structure were analyzed by triaxial instrument. Shear strength and excess pore water pressure at the interface between saturated clay and structure were measured by prefabricating an inclined and drilled structure surface

forming a triaxial composite sample with saturated clay. Compared to the interface direct shearing test which can not distinguish the shearing rates effect and drainage effect of the interface strength characteristics

the proposed method can accurately control the drainage conditions and clarify the influence of the shearing rates on the interface strength. Triaxial consolidated undrained interface shear tests with various surface roughness and shearing rates were carried out. Direct interface shear tests under various shearing rates were also conducted. Results show that the shear strength and excess pore water pressure increase with the increase of the roughness of the structural surface under the same confining pressure. The shear strength and the axial strain required for the stability of excess pore water pressure at the interface increase with the increase of shearing rates. Strict control of drainage conditions and accurate measurement of excess pore water pressure at the interface are of great significance for measuring the interface friction angle between saturated clay and structure.

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