| 郑卫锋,邵龙潭,贾金青.基于数字图像测量技术的基坑开挖卸荷试验研究[J].,2008,(6):851-855 |
| 基于数字图像测量技术的基坑开挖卸荷试验研究 |
| Experimental research on simulated foundation excavation unloading process based on digital image processing technique |
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| DOI：10.7511/dllgxb200806013 |
| 中文关键词: 数字图像测量 应力路径 基坑开挖 侧向卸荷 抗剪强度 |
| 英文关键词: digital image processing stress path foundation excavation lateral unloading shear strength |
| 基金项目: |
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| 摘要点击次数: 1045 |
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| 中文摘要: |
| 以原状粉质黏土为试验土体，采用三轴数字图像测量技术为基础的测试仪器，对基坑开挖卸荷过程的土体应力路径进行模拟，研究不同应力路径条件下的土体应力-应变关系，分析侧向卸荷对基坑土体抗剪强度指标的影响．试验结果表明，经历侧向卸荷应力路径的土体抗剪强度指标与常规三轴加载试验明显不同．数值计算验证了不同应力路径的试验结果对基坑稳定与变形的影响．为了准确地分析基坑的稳定与变形情况，有必要在试验时尽可能模拟基坑的侧向卸荷应力路径． |
| 英文摘要: |
| Based on the testing apparatus of digital image processing technique, using silty clay as testing specimen, the stress paths under foundation excavation unloading process are simulated. In order to analyze and compare experimental data, triaxial shear tests with different stress paths are chosen, and the stress-strain characteristics and shear strength parameters are studied. The test results show that the shear strength parameters of soils after lateral unloading are different from those of conventional triaxial test. A numerical example is given to compare the results obtained from different stress paths. The numerical analyses validate the affection for the foundation′s stability and deformation under different stress paths. For accurate estimation of the foundation′s stability and deformation, laboratory tests should be conducted under similar real conditions in foundation excavation unloading process. |
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