| 基坑开挖卸载过程中考虑应力路径的抗剪强度指标的确定 |
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| 引用本文： | 崔宏环,张立群.基坑开挖卸载过程中考虑应力路径的抗剪强度指标的确定[J].建筑科学,2011,27(5). |
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| 作者姓名： | 崔宏环 张立群 |
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| 作者单位： | 河北建筑工程学院土木系,河北,张家口,075024 |
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| 摘 要： | 针对基坑支护设计所采用的抗剪强度指标忽略了开挖卸载这一应力路径造成的影响,本文通过三轴实验以及数值计算,探讨分析不同应力路径条件下土体的抗剪强度指标的变化。室内试验与数值计算均表明,应力路径对基坑的稳定与变形有很大影响,目前采用传统三轴加载试验得到的抗剪强度指标计算的稳定系数偏大,基坑坑壁水平位移、内力值均偏小,处于相对偏于危险状态。因此,如果忽略了卸荷过程对土体抗剪强度指标的影响,必将对基坑支护设计计算造成不良后果。
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| 关 键 词： | 开挖 卸载 应力路径 三轴实验 |
Characteristic Parameter about the Shear Strength of Soil Considering Different Stress Paths |
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| CUI Hong-huan,ZHANG Li-qun.Characteristic Parameter about the Shear Strength of Soil Considering Different Stress Paths[J].Building Science,2011,27(5). |
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| Authors: | CUI Hong-huan ZHANG Li-qun |
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| Affiliation: | CUI Hong-huan,ZHANG Li-qun(Hebei Institute of Architecture and Civil Engineering,Zhangjiakou 075024,Hebei,China) |
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| Abstract: | According to the realistic stress path of deep excavation,general triaxial apparatus of strain control was transformed and the triaxial test conforming to deep excavation characteristics was designed.These tests were done with the saturated soil that was located in the same site and in the different depths of zhangjiakou urban district.The results of these triaxial tests were compared with those of the general triaxial tests.The study indicates that the parameters of shear strength of soil are different in ... |
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| Keywords: | excavation unloading stat stress path triaxial test |
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