| 珠三角地区典型软土卸荷力学特性研究 |
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| 引用本文： | 王祥秋,;杨文涛,;刘文添. 珠三角地区典型软土卸荷力学特性研究[J]. 中南公路工程, 2014, 0(6): 69-72 |
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| 作者姓名： | 王祥秋, 杨文涛, 刘文添 |
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| 作者单位： | [1]佛山大学环境与土木建筑学院,广东佛山528000; [2]广东工业大学土木交通学院,广东广州510006; [3]广州建筑集团第四建筑有限公司,广东广州510030 |
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| 基金项目： | 国家自然科学基金资助项目（51278121） |
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| 摘 要： | 通过珠三角地区3种典型土层，即：淤泥质土、粉细砂以及红粘土进行室内常规三轴试验与真三轴卸荷力学试验，分析探讨了不同应力路径条件下土体的力学特性，得出了侧向卸荷条件下土体的抗剪强度指标大幅度降低，且有效应力指标降低幅度大于总应力指标，粉细砂抗剪强度指标降低幅度明显大于淤泥质土与红粘土的研究结论，并以此提出珠三角地区超大软土深基坑工程设计与施工应充分考虑土体卸荷力学效应的建议。
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| 关 键 词： | 软弱土体 卸荷力学特性 真三轴试验 |
Study on the Unloading Mechanical Character of Typical Soft Soil in the Pearl River Delta |
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| Affiliation: | WANG Xiangqiu , YANG Wentao, LIU Wentan( Dept. of Civil Engineering, Foshan University, Foshan, Guangdong 528000, China; Faculty of Civil Engineering of Guangdong University of Technology,Guangzhou, Guangdong 510006, China; The Fourth Construction Co. , Ltd of Guangzhou Construction Group, Guangzhou, Guangdong 510030, China) |
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| Abstract: | The conventional three axis test and unloading mechanical test of three true triaxial have been carried out for three kinds of typical soil in the Pearl River Delta,such as Silty clay, silty sand and red clay. the mechanical properties of the soil under different stress path has been discussed, some meaningful research Conclusions have been obtained, such as shear strength of soil will greatly reduced under the lateral unloading conditions, the effective stress index decrease is greater than the total stress index, the shear strength index of Sand were significantly less than silt soil and red clay and so on. And then, some proposals have been put forward that the soil unloading mechanical effect should fully considered on the design and construction of Super soft soil deep foundation pit engineering in Pearl River Delta area. |
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| Keywords: | the soft soil unloading mechanical properties three true triaxial test |
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