A stress-based model for the generation of excess pore water pressure in saturated coral sand subjected to various cyclic stress paths

QIN You; DU Xin-yu; MA Wei-jia; WU Qi; CHEN Guo-xing

doi:10.16285/j.rsm.2022.1581

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A stress-based model for the generation of excess pore water pressure in saturated coral sand subjected to various cyclic stress paths

更新时间：2026-06-25

- A stress-based model for the generation of excess pore water pressure in saturated coral sand subjected to various cyclic stress paths
- Vol. 44, Issue 6, Pages: 1729-1738(2023)
- 作者机构：
  
  1. 南京工业大学岩土工程研究所,江苏,南京,211816
  2. 南京理工大学机械工程学院,江苏,南京,210094
  3. 江苏省土木工程防震技术研究中心,江苏,南京,211816
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.1581
  CLC： TU441
- Online First：17 June 2023，
  
  Published：2023
- 稿件说明：
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QIN You, DU Xin-yu, MA Wei-jia, et al. A stress-based model for the generation of excess pore water pressure in saturated coral sand subjected to various cyclic stress paths[J]. 2023, 44(6): 1729-1738.
DOI：

QIN You, DU Xin-yu, MA Wei-jia, et al. A stress-based model for the generation of excess pore water pressure in saturated coral sand subjected to various cyclic stress paths[J]. 2023, 44(6): 1729-1738. DOI： 10.16285/j.rsm.2022.1581.

摘要

为探究复杂循环加载下不同相对密实度Dr的珊瑚砂超静孔压u增长特性，利用GDS空心圆柱扭剪仪对饱和珊瑚砂进行了系列循环应力主轴90º跳转的均等固结不排水循环剪切试验。试验表明，循环应力路径、应力水平和Dr显著影响饱和珊瑚砂u增长模式；建立了适用于不同D和循环加载模式的超静孔压比r表达式，引入单元体循环应力比USR作为表征复杂循环应力路径的应力指标，给出了模型参数和基于USR和D的表达式。所建立的r表达式对复杂循环加载模式下不同D的饱和珊瑚砂ru增长有较好的预测效果。文献中不同类型砂的试验数据独立验证了所建立的ru表达式的适用性。

Abstract

The excess pore water pressure (ue) in saturated coral sand with different relative densities (Dr) features complicated under complex cyclic loading conditions. In order to investigate its generation characteristics

a series of undrained cyclic shear tests subjected to 90º jump rotation of cyclic principal stresses with various orientations was conducted on such saturated coral sand. These laboratory cyclic tests by using the GDS hollow cylinder torsional apparatus showed that the patterns of ue generation in those test specimens are related to the paths of cyclic stress

levels of cyclic stress

and Dr. Then

the expression of excess pore water pressures ratio (ru) was established for different Dr values and cyclic loading modes. The unit cyclic stress ratio (USR) was introduced as a stress index for characterizing complex cyclic stress path

and the expressions of model parameters and based on USR and Dr were proposed. The established expression of ru can predict the generation of ru in saturated coral sand with various Dr under complex cyclic loading modes. Experimental data of different sand types in the literature independently verify the applicability of the proposed equation for ru.

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