| 碎石变形特征及挤密碎石桩复合地基效果评价 |
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| 引用本文： | 朱志铎,刘义怀.碎石变形特征及挤密碎石桩复合地基效果评价[J].岩土力学,2006,27(7):1153-1157. |
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| 作者姓名： | 朱志铎 刘义怀 |
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| 作者单位： | 1.东南大学 交通学院，南京 210096；2.江苏省高速公路指挥部，南京 210004 |
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| 摘 要： | 挤密碎石桩的材料是粒径较大的碎石，粒间粘结很小，其力学特性和其密度与侧压力有关，以往研究多作为弹性材料看待。利用大型三轴试验研究了碎石的变形特点，并根据试验结果总结了碎石的变形规律。在工程上常遇到的应变范围内，碎石三轴剪切试验的应力-应变关系可用双曲线拟合，体变曲线则接近于抛物线；单向压缩试验的轴向应力-应变符合幂函数曲线。徐－宿高速公路挤密碎石桩地基处理现场试验结果表明，经过碎石桩处理后的液化地基的液化势得到消除，该试验研究工作对类似工程有参考价值。
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| 关 键 词： | 碎石变形 复合地基 液化势 变形规律 三轴剪切试验 单向压缩试验 |
| 文章编号： | 1000-7598-（2006）07-1153-05 |
| 收稿时间： | 2004-10-11 |
| 修稿时间： | 2005-04-16 |
Deformation characteristics of broken stone and effect evaluation of composite foundation with stone compaction column |
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| ZHU Zhi-duo,LIU Yi-huai.Deformation characteristics of broken stone and effect evaluation of composite foundation with stone compaction column[J].Rock and Soil Mechanics,2006,27(7):1153-1157. |
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| Authors: | ZHU Zhi-duo LIU Yi-huai |
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| Institution: | 1.College of Transportation, Southeast University, Nanjing 210096, China; 2.Headquarters of Highway of Jiangsu, Nanjing 210004, China |
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| Abstract: | Stone column is composed of broken stones,among which the interconnections are very small.Thus the mechanical characteristics of broken stones depends on their densites and lateral pressure mainly.The deformation characteristics of broken stones are studied by the large scale triaxial shear tests and axial compression tests,the laws about broken stones are drawn according to the test results as follows: the relationship between the deviator stress and axial strain is close to a hyperbola and the relationship between the volume strain and the axial strain is similar to a parabola for the triaxial shear tests;the relationship between the axial stress and the axial strain are near to a power function curve for the axial compression tests.The test for the composite foundation of stone columns of Xu-Su Expressway is described in detail.The results show that the liquefaction potential has been eradicated when the stone columns are used to treat the soil foundation of this area.The tests and results have a referential value to the similar engineering problems. |
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| Keywords: | stone column ground treatment liquefaction potential laws of deformation triaxial shear tests axial compression tests |
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