Correlation between cone resistance with standard penetration value for predicting consistency of cohesive soil in Eastern India

IF 1.827 Q2 Earth and Planetary Sciences Arabian Journal of Geosciences Pub Date : 2024-09-10 DOI:10.1007/s12517-024-12064-6
Saptarshi Nandi, Dipanjan Basu, Kaushik Bandyopadhyay, Amit Shiuly
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Abstract

In the geotechnical engineering field, the rapid speed of urbanization triggers the need for direct measurements of sub-soil parameters through in situ testing, accompanied by instant results. At this juncture, the cone penetration test (CPT) is selected for this study. Here, an attempt is made to develop a correlation between cone penetration resistance (qc) and standard penetration blow count (SPT N) in order to predict a reference range of qc for cohesive (silty clay/clayey silt) sub-soil of different SPT-based consistencies. In this context, 25 CPT were conducted adjacent to conventional boreholes accompanied by SPT tests at eight important locations in West Bengal (WB) and Odisha (OR), India, focusing on infrastructure development. Primarily, sub-soil is characterized by bulk unit weight (γ) along with soil behavior type index (IC) estimated from the CPT and compared with the sub-soil profile identified from conventional boreholes. Further, a comparison of qc with SPT N is made to establish a correlation. Also, an attempt is made to tally the established correlation with the earlier correlations established for different regions. This study quantitatively establishes a quadratic correlation (R2 = 0.84) between qc and SPT N, which is found to be in good agreement with the previous correlations. Overall, the key findings of this study, i.e., the predicted range of qc, reveal a reliable method for assessing the consistency of cohesive sub-soil by virtue of the qc. However, this correlation is limited to soft to very stiff silty clay/clayey silt sub-soil formation.

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用于预测印度东部粘性土稠度的锥体阻力与标准贯入值之间的相关性
在岩土工程领域,快速的城市化进程促使人们需要通过现场测试直接测量下层土的参数,并获得即时结果。此时,本研究选择了锥入试验(CPT)。本研究试图建立锥入阻力(qc)与标准贯入击数(SPT N)之间的相关性,以预测基于 SPT 不同稠度的粘性(淤泥质粘土/粘土质粉砂)底土的 qc 参考范围。为此,在印度西孟加拉邦(WB)和奥迪沙邦(OR)的八个重要地点,在常规钻孔附近进行了 25 次 CPT 试验,同时进行了 SPT 测试,重点关注基础设施的发展。主要是通过体积单位重量 (γ),以及通过 CPT 估算的土壤行为类型指数 (IC) 来描述下层土壤的特征,并与通过常规钻孔确定的下层土壤剖面进行比较。此外,还对 qc 与 SPT N 进行了比较,以建立相关性。此外,还尝试将所建立的相关性与不同地区早期建立的相关性进行比较。这项研究在 qc 和 SPT N 之间定量地建立了二次相关性(R2 = 0.84),与之前的相关性非常吻合。总体而言,本研究的主要发现(即 qc 的预测范围)揭示了一种通过 qc 评估粘性底土稠度的可靠方法。不过,这种相关性仅限于软至非常坚硬的淤泥质粘土/粘土质粉砂底土。
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来源期刊
Arabian Journal of Geosciences
Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
0.00%
发文量
1587
审稿时长
6.7 months
期刊介绍: The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.
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