Effect of shrinkage behavior by drying on mechanical properties of naturally alluvial clays.

首席研究员Katsumi Fujii教授（岩手大学）采用蒙脱土作为该实验的标准样品，蒙脱土是一种重要的膨胀粘土矿物，通常沉积在八郎县。测定了蒙脱土在悬浮液和膏体状态下的黏度，特别是在不同孔隙溶液浓度下的流动曲线。根据这些结果，推导并检验了屈服应力。除了膨胀粘土外，还测量了非膨胀粘土和稳定粘土高岭石的粘度。研究者，Kiyoshi Koga教授（岩手大学）支持粘度的自动测量。研究者Yasuhisa Adachi博士（筑波大学）用显微镜-摄像机系统观察了粘土颗粒的絮凝沉降。然后从图像数据处理中检测沉降速度，并与溶液浓度相关。另一位研究人员Nobuo Toride博士采集了有明湾冲积粘土的样本，然后测量了盐水环境下的水力导电性。用固相比和孔溶液浓度等因素对实验数据进行了检验。在2001学年，我们综合上述结果，从粘土颗粒结构变化的角度考虑干燥收缩对粘土力学性能的影响。这份报告是他们的摘要，完整的一份在附件中。

Head investigator, Prof. Katsumi Fujii (Iwate Univ.) adopted montmorillonite as a standard sample for this experiment, which is significant swelling clay mineral and typically deposited in Hachiroh-gata. Viscosities of montmorillonite were measured in the state of suspensions and paste, especially flow curves were detected under the several concentrations of pore solution. From these results, yield stresses were derived and examined. In addition to a swelling clay, viscosities of non-swelling and stable clay, kaolinite, were also measured. Investigator, Prof. Kiyoshi Koga (Iwate Univ.) supported the automatic measurement of viscosity.Investigator, Dr. Yasuhisa Adachi (Tsukuba Univ.) observed the flocculated settling of clay particles with microscope-video camera system. Then settling velocities were detected from image data processing and related to the solution concentrations. Another investigator, Dr. Nobuo Toride took samples of the alluvial clays of Ariake Bay, then measured hydraulic conductivities under the saline environment. These experimental data were examined with the factors of solid ratios and pore solution's concentrations.In academic year 2001, we synthesized the results mentioned above, then considered effect of shrinkage by drying on mechanical properties of clay from the viewpoint of changes in clay particles structures. This report is the abstract of them, complete one is attached to this document.