土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (6): 972-976.

• 测试技术 • 上一篇    下一篇

不同试验条件下花岗岩残积土不排水抗剪强度指标研究

吴国颖1,2,3，潘生贵4，郑伟军4   

  1. (1.福州大学环境与资源学院，福州 350116；2.地质工程福建省高校工程研究中心，福州 350116；3.自然资源部丘陵山地地质灾害防治重点实验室，福州 350116；4.华东勘测设计院(福建)有限公司，福州 350003)
  • 收稿日期:2021-05-20 修回日期:2021-06-03 出版日期:2022-12-31 发布日期:2022-12-28
  • 作者简介:吴国颖（1996-），女，硕士研究生，研究方向为岩土体稳定性分析等。

Undrained Shear strength Parameters for Residual Granitic Soil Samples Under Different Test Conditions

WU Guoying1,2,3, PAN Shenggui4， ZHENG Weijun4   

  1. (1.College of Environment and Resources, Fuzhou University, Fuzhou 350116；
    2.Fujian Provincial Universities Engineering Research Center of Geological Engineering, Fuzhou 350116；
    3.Key Laboratory of Geohazard Prevention of Rolling Hill Mountains, Ministry of Land and Resources, Fuzhou 350116；
    4.Huadong Engineering (Fujian) Co. Ltd., Fuzhou 350003)
  • Received:2021-05-20 Revised:2021-06-03 Online:2022-12-31 Published:2022-12-28

摘要： 为了对比不同试验方法获得的花岗岩残积土不排水抗剪强度指标的差异，对福建莆田某海上风电场的原状花岗岩残积土开展快剪试验、固结快剪试验、三轴不固结不排水（UU）压缩试验、三轴固结不排水（CU）压缩试验，研究几种试验所获得的不排水抗剪强度的差异。研究结果表明：固结对于不排水抗剪强度有显著影响，固结后剪切的试样获得的粘聚力c、内摩擦角φ均大于未固结条件下的试样；取样深度对直剪试验、UU试验测得的粘聚力c影响较大；CU试验的内摩擦角φcu、有效内摩擦角φ′cu随深度的增加而增大，有效粘聚力c′cu随深度增加而减小；相同深度、固结条件的直剪试验获得的粘聚力c小于三轴试验，φ远大于三轴试验。

关键词: 花岗岩残积土, 直剪试验, 三轴试验, 不排水抗剪强度指标

Abstract: In order to compare the difference in the undrained shear strength parameters of the residual granitic soil samples obtained by different test methods, the undisturbed residual granitic soil samples from an offshore wind farm in Putian, Fujian Province were performed with the laboratory unconsolidated undrained direct shear tests, the consolidated undrained shear tests, the unconsolidated-undrained (UU) triaxial compression tests, the consolidated-undrained (CU) triaxial compression tests. The objective of these tests was to study undrained shear strength parameters obtained from different test methods. The results show that the consolidation has a significant effect on the undrained shear strength. The cohesion c and the internal friction angle φ obtained by the sample sheared after consolidation are greater than those under the unconsolidated condition; the sample depth has a great effect on the cohesion c measured by the direct shear tests and UU tests; the internal friction angle φcu and the effective internal friction angle φ'cu of the CU tests increase with the increase of the sample depth, and the effective cohesion φ'cu decreases with the increase of the sample depth; the cohesion c obtained by the direct shear tests with the same depth and consolidation conditions is smaller than the triaxial tests, and φ is much larger than the triaxial tests.

Key words: Residual Granitic Soils, Direct Shear Tests, Triaxial Tests, Undrained Shear Strength Index

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