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Thirty-seven-year investigation of quicklime-treated soil produced by deep mixing method

机译：深层混合法生石灰处理土壤研究三十七年

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摘要

The deep mixing method was developed in Japan and Scandinavian countries in the 1970s. Subsequently, considerable research studies have been carried out on the strength characteristics of treated soil, the interaction of treated soil and surrounding soils, the development of new binders, the development of new execution machines and techniques, the establishment of design procedures and so on. However, long-term changes in the properties of treated soil have not yet been clarified. Two columns of in situ quicklime-treated soil in a soil tank for more than 37 years were analysed in this study. Laboratory tests were conducted on them at curing periods of 11, 27 and 37 years. This paper presents the change of wet density, water content, unconfined compressive strength and calcium content. Additionally, needle-penetration resistance, pH and electrical conductivity were measured in order to reveal the deterioration properties from the surface exposed to soil for more than 37 years. The results showed that the strength of the in situ quicklime-treated soil remained, even after 37 years. However, the deformation modulus tended to decrease and the treated soil deteriorated from the surface.
机译：1970年代在日本和斯堪的纳维亚国家开发了深层混合法。随后，对处理过的土壤的强度特性，处理过的土壤与周围土壤的相互作用，新粘合剂的开发，新执行机器和技术的开发，设计程序的建立等进行了大量研究。但是，尚未弄清处理过的土壤的长期变化。在这项研究中，分析了在土壤罐中使用两根原土生石灰处理过的土壤超过37年的情况。对它们进行了11、27和37年固化期的实验室测试。本文介绍了湿密度，水含量，无侧限抗压强度和钙含量的变化。另外，测量针刺电阻，pH和电导率以揭示暴露于土壤超过37年的表面的劣化特性。结果表明，即使经过37年，原位生石灰处理过的土壤仍保持了强度。但是，变形模量倾向于降低，并且处理后的土壤从表面变质。

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  • 来源
    《Ground improvement》 |2018年第gi3期|135-147|共13页
  • 作者

    Hidenori Takahashi; Yoshiyuki Morikawa; Naruhiko Fujii; Masaki Kitazume;

  • 作者单位

    Soil Stabilization Group, Geotechnical Engineering Division, Port and Airport Research Institute, MPAT, Yokosuka, Japan;

    Geotechnical Engineering Division, Port and Airport Research Institute, MPAT, Yokosuka, Japan;

    Soil Stabilization Group, Geotechnical Engineering Division, Port and Airport Research Institute, MPAT, Yokosuka, Japan;

    Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Tokyo, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    field testing monitoring; foundations; geotechnical engineering;

    机译：现场测试与监控;基础;岩土工程;

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