Core samples to a depth of approximately 50 m and undisturbed soil samples were retrieved from eight locations in the Saga Plain, Japan, to investigate the effects of the depositional environment and post-depositional processes on the engineering properties of Quaternary clays in the Saga Plain. The engineering properties of these soil samples were measured, and the test results showed that the clays in the Saga Plain have a high void ratio, high water content, high compressibility, high sensitivity, and low stiffness. The one-dimensional compression curves plotted above the sedimentation compression line proposed by Burland, and the compression index was high, which indicated that the clays had been cemented to some degree. The clays have high strength sensitivity and high stress sensitivity, indicating that they have strong structures. It was considered that a considerable amount of volcanic ash from the four large volcanic eruptions that occurred during the deposition of these clays settled into the clays, resulting in a certain degree of cementation, which was attributed as the main driver of the strong structure in these clays. Comparisons of the NaCl concentration, pH, and oxidation-reduction potential (ORP) of the clay samples representing the initial depositional environment and the current ground environment showed that salt leaching occurred in the Ariake clay formation, and that the ground environment changed. When the NaCl concentration was less than approximately 2 g/L, the strength sensitivity of the Ariake clay samples with low-activity clay minerals significantly increased due to the decrease in the liquid limit and subsequent significant decrease in the remolded undrained shear strength. Therefore, salt leaching was probably a main cause of the high strength sensitivity of the clays in the Saga Plain. The depositional environment at some locations changed from an alkaline, reducing environment, to an acidic, oxidative environment, with the potential to change into a strongly acidic environment, which could have deteriorated the strength of the cement/lime-treated clays in the Saga Plain.

中文翻译：

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佐贺平原沉积环境和沉积后过程对第四纪黏土工程性质的影响

从日本佐贺平原的八个位置取回约50 m深度的岩心样品和未扰动的土壤样品，以研究沉积环境和沉积后过程对佐贺平原第四纪粘土工程性质的影响。测量了这些土壤样品的工程性质，测试结果表明，佐贺平原的粘土具有高孔隙率，高含水量，高可压缩性，高灵敏度和低刚度。一维压缩曲线绘制在Burland提出的沉降压缩线上方，并且压缩指数很高，表明粘土已经胶结到一定程度。粘土具有高强度敏感性和高应力敏感性，表明它们具有坚固的结构。据认为，在这些粘土沉积过程中发生的四次大火山喷发中产生了大量的火山灰沉淀到粘土中，导致一定程度的胶结作用，这被认为是这些火山岩中坚固结构的主要驱动力。黏土。代表初始沉积环境和当前地面环境的粘土样品的NaCl浓度，pH和氧化还原电位（ORP）的比较表明，盐浸在Ariake粘土地层中发生，并且地面环境发生了变化。当NaCl浓度小于约2 g / L时，低液粘土矿物的Ariake粘土样品的强度敏感性由于液限的降低而显着提高，随后重塑的不排水剪切强度显着降低。因此，盐浸可能是佐贺平原粘土高强度敏感性的主要原因。某些地方的沉积环境从碱性的还原性环境变为酸性的氧化性环境，有可能转变为强酸性的环境，这可能会使佐贺平原的水泥/石灰处理过的粘土的强度下降。 。