In-situ stabilization of clays with lime, dolerite and quartzite powders

IF 0.9 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
S. A. Shah
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引用次数: 4

Abstract

This study presents the results of in-situ field stabilization of clay soil using lime, dolerite and quartzite powders. The rock samples were collected from Oghi village and Misri Banda village of Khyber Pakhtunkhwa Province, Pakistan. A 415m2 site comprised of loose clay in Haripur district of Khyber Pakhtunkhwa was selected for field stabilization. In order to implement the experimental plan, eight test pits were dug and soil samples were collected from each pit to determine their major geotechnical properties. The raw soil contained kaolinite, illite and montmorillonite and hence characterized as CH type according to the Unified Classification System. The addition of 6 % lime was found to produce the most positive impact on soil properties. Following a steady augment by 10 %, a maximum of 30 % dolerite and quartzite powders were separately mixed with each of the 6 % lime-added soil samples. The resulting mixed soils were placed back into their respective pits and compacted using compaction vibrator. Standard penetration, field density and plate load tests were performed on each test pit. Finally, soil samples were extracted from all the test pits and the values of their direct shear box and Atterberg limits were measured. The results demonstrate that the addition of dolerite and quartzite leads to a significant increase in the bearing capacity, dry density, penetration resistance and angle of internal friction and thus improves the performance of the formerly lime-stabilized soil by drastically decreasing its compressibility. The resulting improvement is mainly due to the denser and less hydrophilic character of the constituents of the added rock powders as compared with the lime and raw soil. It has also been found that the magnitude of impact on the soil properties by dolerite and quartzite is notably different owing to the difference in mineralogical composition and physical characteristics of individual minerals present in both rock types. This study would help construction engineers for better soil treatment. ARTICLE INFO
用石灰、粗玄岩和石英岩粉末原位稳定粘土
本文介绍了石灰、白云石和石英岩粉对粘土进行现场稳定的结果。岩石样本采集自巴基斯坦开伯尔-普赫图赫瓦省的Oghi村和Misri Banda村。在开伯尔-普赫图赫瓦省的哈里普尔地区,一个415平方米的由松散粘土组成的场地被选中进行现场稳定。为了实施试验计划,挖掘了8个试验坑,并从每个坑中收集了土样,以确定其主要岩土力学特性。原土中含有高岭石、伊利石和蒙脱石,按统一分类系统划分为CH型。研究发现,添加6%石灰对土壤性状的影响最为积极。在稳定增加10%之后,最多30%的白云石和石英岩粉末分别与添加了6%石灰的土壤样品混合。将得到的混合土放回各自的坑中,用压实振动器压实。在每个试验坑上进行标准贯入、场密度和板载试验。最后,从所有试验坑中提取土样,测量其直剪箱和阿特贝格极限值。结果表明:白云石和石英岩的加入显著提高了石灰稳定土的承载力、干密度、渗透阻力和内摩擦角,通过显著降低石灰稳定土的压缩性,改善了石灰稳定土的性能。结果改善的主要原因是,与石灰和原土相比,添加的岩石粉的成分更致密,亲水性更差。研究还发现,由于两种岩石类型中单个矿物的矿物学组成和物理特征不同,玄武岩和石英岩对土壤性质的影响程度有显著差异。这项研究将有助于建筑工程师更好地处理土壤。条信息
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来源期刊
Acta Geodynamica et Geomaterialia
Acta Geodynamica et Geomaterialia 地学-地球化学与地球物理
CiteScore
2.30
自引率
0.00%
发文量
12
期刊介绍: Acta geodynamica et geomaterialia (AGG) has been published by the Institute of Rock Structures and Mechanics, Czech Academy of Sciences since 2004, formerly known as Acta Montana published from the beginning of sixties till 2003. Approximately 40 articles per year in four issues are published, covering observations related to central Europe and new theoretical developments and interpretations in these disciplines. It is possible to publish occasionally research articles from other regions of the world, only if they present substantial advance in methodological or theoretical development with worldwide impact. The Board of Editors is international in representation.
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