印度尼西亚Cikarang膨胀粘土SPT和CPT对比

Eddy Triyanto Sudjatmiko
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引用次数: 1

摘要

世界各地已经报道了几种CPT-SPT相关性,以便从一组可获得的数据到另一组数据来估计土壤物理性质。虽然大多数相关性是针对粉质和沙质土壤的,但关于这些相关性是否与印度尼西亚粉质粘土土壤条件相对应的信息并不充分。因此,本研究的目的是验证和增强广义CPT-SPT相关性,重点关注印度尼西亚土壤条件,以提高其预测精度。研究中的土壤是粉质粘土层,覆盖了印度尼西亚西爪哇北部的大部分地区。这些类型的土壤以其膨胀的粘土特征而闻名,由于含水量的季节性变化,它们对体积变化很敏感。在本研究中,数据收集于芝卡朗地区的8个地点。每个地点由专用SPT和CPT对组成,彼此之间相距2(2)米。在对该类型土壤的相关数据进行各种统计回归分析后,建立了一个简单的线性经验CPT-SPT相关性,并具有相当高的相关性,从而可以对相关土壤类型的测试结果进行翻译和预测。CPT与SPT的简单相关性为n = qc/NSPT = 0.225 (Mpa), n的数据分布范围为0.15 (Mpa) ~ 0.33 (Mpa)。这一结果表明,与世界各地发表的各种相关性相比,n值要低得多。对于粘土的形成,低n值也反映了较低的密度和黏结粘土的黏聚性。
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SPT and CPT Correlation of Expansive Clay in Cikarang, Indonesia
Several CPT-SPT correlations have been reported worldwide to allow for the estimate of soil physical properties from one set of accessible data to another. Although most correlations are for silty and sandy soils, there is insufficient information on whether these correlations correspond to the silty clay soil conditions in Indonesia. Therefore, this study aims is to validate and enhance the generalized CPT-SPT correlation, with emphasis on Indonesian soil conditions to increase its prediction accuracy. The soil under examination is silty clay layers that cover most of Northern parts of West Java – Indonesia. Known with its expansive clay characteristics, these type of soils are sensitive to volume change as a result of seasonal variations in water content. For this study, data is collected from 8 (eight) locations in Cikarang Area. Each location consists of dedicated SPT and CPT pairs tests at 2 (two) m distance between each other. After analyzed with various statistical regression analysis of data relevant to this type of soil, a simple linear empirical CPT-SPT correlation with a fairly high correlation has been established allowing test findings to be translated and predicted for the relevant soils type. The simple CPT and SPT correlation is in form of n = qc/NSPT = 0.225 (Mpa), with data distribution of n ranges from 0.15 (Mpa) to 0.33 (Mpa). This results shows much lower n values compared to various correlation have been published worldwide. With respect to the clay soil formation, the low of n-value also reflect a lower density and cohesion bonding clay properties.
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