| 石灰改良南阳膨胀土的强度特征与微观机理研究 |
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| 引用本文： | 锁文韬,李新明,孙玉周.石灰改良南阳膨胀土的强度特征与微观机理研究[J].路基工程,2018,0(5):30. |
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| 作者姓名： | 锁文韬 李新明 孙玉周 |
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| 作者单位： | 中原工学院, 河南新郑 451191 |
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| 基金项目： | 国家自然科学基金项目（51509274）；河南省科技创新人才计划（164200510020）；河南省高等学校重点科研项目计划（15A560013）；中原工学院青年骨干教师资助计划 |
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| 摘 要： | 以南阳膨胀土为研究对象，对掺灰比4%~12%膨胀土进行直接剪切试验，研究不同掺灰比膨胀土应力-位移关系，分析不同掺灰比对膨胀土强度的影响规律。通过电镜扫描试验，探求掺灰改良膨胀土微观结构变化的机理。结果表明:在相同上覆荷载下，膨胀土强度随着掺灰比的提高而增强，掺灰比由7%增至10%时膨胀土抗剪强度增幅明显，掺灰比超过10%后抗剪强度增幅较小。电镜扫描结果显示石灰与膨胀土颗粒形成团聚体结构，使改良膨胀土中粗颗粒含量提升，增强了土体结构性。
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| 关 键 词： | 膨胀土 石灰改良 掺灰比 抗剪强度 微观机制 |
| 收稿时间： | 2019-11-12 |
Study on Strength Characteristics and Microscopic Mechanism of Nanyang Lime-modified Expansive Soil |
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| Abstract: | Taking Nanyang expansive soil as the research object, the direct shear tests of expansive soils with 4%~12% lime blending ratio were conducted to study the stress-displacement curves of expansive soils and analyze the influence of different blending ratio on the strength of expansive soils. Through the scanning electron microscope test, the mechanism of the microstructure of the expansive soil is explored. The results showed that with the same overburden, the strength of the expansive soil increases with the increase of the lime blending ratio, as the lime ratio increases from 7% to 10%, the shear strength of the expansive soil increases obviously and when the lime ratio exceeds 10%, the shear strength increases slightly. The result of the scanning electron microscope shows that the lime and expansive soil particles form an aggregated structure, which increases the content of coarse particles in the expansive soil and strengthens the structure of the soil. |
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