Abstract The purpose of this study is to investigate and relate the geotechnical parameters with the mineralogical properties of the Miocene and Plio-Quaternary (Pliocene to Quaternary) lacustrine and fluvial sediments, particularly clayey soils in the Orta County, Cankiri. The study area is located about 110 km northeast of Ankara which is the capital city of the Republic of Turkey and Orta is a small county of Cankiri. The study area is a structural depression in the northern part of the Orta plain which is filled by fault-controlled continental sedimentation. In order to correlate the geotechnical and mineralogical characteristics and to establish a relation between these properties, comprehensive geotechnical laboratory studies have been performed. For correlation purposes, disturbed and undisturbed soil samples were collected from twenty-two locations of the study area. On these samples, mineralogical (i.e., methylene blue absorption, specific surface area determination, X-ray powder diffraction (XRD) and scanning electron microscope (SEM-EDAX)) analysis and geotechnical (i.e., sieve analysis, hydrometer, Atterberg (consistency) limits, oedometer and swelling) tests were implemented. By the aid of the statistical analysis, cross-correlation of the soil properties was established by the regression analyses performed. In particular, the plasticity index was correlated with cation exchange capacity, specific surface area, clay content, percent of fines, smectite and smectite/kaolinite ratio (SKR). There was a direct relationship between PI and smectite percentage as well as between PI and SKR. Additionally, the liquid limit was correlated with the clay content and the effect of the specific surface area on the swelling characteristics was studied. The effects of the mineralogical properties of the Orta clays together with the geological history on geotechnical parameters were investigated by considering the relationships mentioned. The results of the study revealed that the mineralogical characteristics had a significant effect on the geotechnical behavior of clayey soils of the Orta County which was demonstrated by regression analyses. Finally it was identified that the geotechnical properties of clayey soils can be approximated and more reliably determined if the mineralogical character and composition of clay is accurately investigated and well developed.

中文翻译：

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矿物学对粘土岩土工程参数影响的评估：以土耳其恰克里奥尔塔县为例

摘要 本研究的目的是调查岩土工程参数与中新世和上新-第四纪（上新世至第四纪）湖相和河流沉积物的矿物学特性，特别是坎基里奥尔塔县的粘土质土壤的矿物学特性。研究区位于土耳其共和国首都安卡拉东北约 110 公里处，奥尔塔是坎基里的一个小县。研究区为奥尔塔平原北部的构造洼地，被断层控制的大陆沉积充填。为了关联岩土和矿物学特征并建立这些特性之间的关系，已经进行了全面的岩土工程实验室研究。出于相关目的，从研究区的 22 个地点收集了扰动和未扰动的土壤样品。在这些样品上，矿物学（即亚甲蓝吸收、比表面积测定、X 射线粉末衍射 (XRD) 和扫描电子显微镜 (SEM-EDAX)）分析和岩土工程（即筛分分析、比重计、Atterberg（一致性））极限、固结仪和膨胀）测试。借助统计分析，通过回归分析建立了土壤特性的互相关。特别是，可塑性指数与阳离子交换能力、比表面积、粘土含量、细粉百分比、蒙脱石和蒙脱石/高岭石比 (SKR) 相关。PI 与蒙脱石百分比之间以及 PI 与 SKR 之间存在直接关系。此外，液限与粘土含量相关，研究了比表面积对溶胀特性的影响。通过考虑上述关系，研究了奥尔塔粘土的矿物学特性以及地质历史对岩土工程参数的影响。研究结果表明，矿物学特征对奥尔塔县粘土质土的岩土工程性能有显着影响，回归分析表明这一点。最后确定，如果粘土的矿物学特征和成分得到准确研究和充分开发，则可以近似并更可靠地确定粘土的岩土特性。