王晓丽,裴会敏,王栋.未胶结钙质砂静力和循环强度的单剪试验研究[J].海洋工程,2018,36(6):124~129
未胶结钙质砂静力和循环强度的单剪试验研究
Static and dynamic strengths of uncemented calcareous sand from simple shear tests
  
DOI:10.16483/j.issn.1005-9865.2018.06.015
中文关键词:  钙质砂  单剪试验  循环荷载  液化  应力水平  相对密实度  南海
英文关键词:calcareous sand  simple shear tests  cyclic loading  liquefaction  stress level  relative density  South China Sea
基金项目:国家自然科学基金项目(41772294)
作者单位E-mail
王晓丽 中国海洋大学 山东省海洋环境地质工程重点实验室山东 青岛 266100 wangxiaoli@stu.ouc.edu.cn 
裴会敏 中国海洋大学 山东省海洋环境地质工程重点实验室山东 青岛 266100  
王栋 中国海洋大学 山东省海洋环境地质工程重点实验室山东 青岛 266100 dongwang@ouc.edu.cn 
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中文摘要:
      通过等体积的单调和循环单剪试验研究南海未胶结钙质砂的静、动力反应,讨论应力水平和相对密实度对钙质砂静、动力强度的影响,并与典型的石英砂性质进行比较。在单调单剪试验中,中密和密实钙质砂在100~400 kPa范围的初始竖向应力下都表现出应变硬化的性质,有效内摩擦角随剪应变增大。在循环单剪试验中,钙质砂的反应与相对密实度和初始竖向应力密切相关,但中密和密实钙质砂中的等效孔压都能达到初始竖向应力的85%~90%,此时剪应变突增,试样发生破坏。与相近密实度的石英砂相比,钙质砂抵抗液化的能力更强。提出了南海钙质砂动强度的归一化表达式,建立了不排水静强度、不排水动强度和循环次数之间的关系。
英文摘要:
      The monotonic and cyclic simple shear tests with constant volume were conducted to study the static and dynamic responses of uncemented calcareous sand in South China Sea. The effects of stress levels and relative densities on the static and dynamic strengths were discussed, with comparison between the calcareous sand and typical silica sand. In monotonic simple shear tests, the medium dense and dense calcareous sands exhibited strain-hardening as the initial vertical stress ranged from 100 to 400 kPa. In the cyclic tests, the responses of calcareous sand depended on both the relative density and initial vertical stress. However, the equivalent excess pore pressures in both the medium dense and dense sands could reach 85%~90% of the initial vertical stress, accompanied by sudden increase of the shear strain and failure of samples. The potential to resist liquefaction of calcareous sand was better than silica sand at the similar relative density. For calcareous sand in South China Sea, a normalized expression of dynamic strength was proposed to get the relationship between undrained static strengths, undrained dynamic strengths and cyclic numbers.
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