| 土体侧向卸荷对基坑支护位移的影响 |
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| 引用本文： | 庄心善,胡恺.土体侧向卸荷对基坑支护位移的影响[J].土工基础,2009,23(6):43-45. |
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| 作者姓名： | 庄心善 胡恺 |
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| 作者单位： | 湖北工业大学,土木工程与建筑学院,武汉,430068 |
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| 基金项目： | 湖北省教育厅重点项目 |
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| 摘 要： | 取武汉地区具有代表性的粉质粘土,在真三轴仪上按基坑开挖过程中侧向土体的应力路径进行模拟试验,得到平面应变条件下固结不排水卸荷试验结果,由试验结果可知,侧向卸荷土体其应力-应变关系随固结压力的增加,由应变硬化型向应变软化型转化;侧向卸荷土体可以在很小应变下发生破坏;通过对邓肯—张模型的修正,阐述了开挖卸荷土体模型中卸荷模量的适用范围。
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| 关 键 词： | 侧向卸荷 真三轴试验 平面应变 位移 |
Effect of Lateral Unloading on Foundation Pit Displacement |
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| ZHUANG Xin shan,HU Kai.Effect of Lateral Unloading on Foundation Pit Displacement[J].Soie Engineering and Foundation,2009,23(6):43-45. |
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| Authors: | ZHUANG Xin shan HU Kai |
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| Affiliation: | (Hubei University of Technology, Wuhan 430068, China) |
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| Abstract: | Taking samples of silty clay existing distinctively in Wuhan District, a simulation experiment has been carried on true triaxial experiment. The lateral unloading stress path of foundation pit acts is carried out in order to obtain results of consoli- dated undrained triaxial unloading test under plane strain condition. The results show that the stress-strain curve would change from strain hardening to strain softening with the increase of consolidation pressure in lateral unloading stress path. Soil samples in condition of lateral unloading will be broken with minor stress condition. The area of unloading modulus in unloading model has been discussed by modified Duncan-Chang constitutive model. |
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| Keywords: | lateral unloading ture triaxial experiment plane strain displacement |
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