| 荆门弱膨胀土的胀缩与渗透特性试验研究 |
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| 引用本文： | 周葆春,孔令伟,郭爱国.荆门弱膨胀土的胀缩与渗透特性试验研究[J].岩土力学,2011,32(Z2):424-429. |
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| 作者姓名： | 周葆春 孔令伟 郭爱国 |
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| 作者单位： | 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;信阳师范学院土木工程学院; |
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| 基金项目： | 国家自然科学基金资助项目(No.51009118); 中国博士后科学基金资助项目(No.20100470058); 河南省基础与前沿技术研究计划项目(No.082300410180); 河南省教育厅自然科学基础研究计划项目(No.2008B560012) |
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| 摘 要： | 以荆门弱膨胀土为研究对象,开展了完整的胀缩与渗透特性试验,获得了5种不同压实度下膨胀土及其石灰改良土的胀缩与渗透特征。结果表明:膨胀土的膨胀力-干密度关系可用幂函数表达,而无荷膨胀率、有荷膨胀率、体缩率与干密度均非单调关系;由于压实与膨胀效应的耦合作用,95%压实度下膨胀土的无荷膨胀率、有荷膨胀率和体缩率均较小,若直接利用膨胀土进行路基与地基填筑,该压实度下土样不仅具备较大的刚度与强度且胀缩变形较小。经石灰改性后,膨胀力与湿胀变形基本消除,干缩变形大幅降低,胀缩总率仅为0.7%。膨胀土与石灰土渗透系数均很小,且都随干密度的增大而降低,其与干密度的关系仍可用幂函数描述;石灰土的渗透系数大于相应压实度下的膨胀土;而当二者干密度相近时,渗透系数接近。
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| 关 键 词： | 膨胀土 胀缩特性 渗透特性 压实度 干密度 |
| 收稿时间： | 2011-05-03 |
Experimental study of characteristics of swelling-shrinkage and permeability for Jingmen weak expansive soil |
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| ZHOU Bao-chun,KONG Ling-wei,GUO Ai-guo.Experimental study of characteristics of swelling-shrinkage and permeability for Jingmen weak expansive soil[J].Rock and Soil Mechanics,2011,32(Z2):424-429. |
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| Authors: | ZHOU Bao-chun KONG Ling-wei GUO Ai-guo |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. College of Civil Engineering, Xinyang Normal University, Xinyang, Henan 464000, China |
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| Abstract: | A series of tests for characteristics of swelling-shrinkage and permeability are carried out on Jingmen weak expansive soil under five different compactnesses and on the lime-treated soil.The test results show that the swelling pressure-dry density relation can be represented by a power function;while the relations between non-loaded swelling ratio,linear swelling ratio,volume shrinkage ratio and dry density are all non-monotonous.The expansive soil with the compactness of 95 % has the lower swelling ratio ... |
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| Keywords: | expansive soil swelling-shrinkage characteristics permeability characteristics degree of compaction dry density |
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