The elasto-plastic properties of naturally deposited and artificial ground in teims of structure, overconsolidatnn and anisotropy

1)重塑试样弹塑性参数确定的最佳条件评价。制作重塑粘土的最佳含水量是其液限。2)测定自然沉积的粘土和砂土的性质。通过模拟一系列过程，包括土壤取样、仪器设置和实验室测试，可以估计自然沉积的粘土和沙子的土壤性质。异常地基试验路堤变形与破坏的估计。研究结果2)可应用于特殊土壤。对某试验路堤在特殊地基条件下的圆滑破坏过程进行了预测模拟。4)路堤荷载作用下软土大延迟固结预测。地基粘土的敏感性比可达8.0以上，压缩指数比Cc/Ccr可达1.5以上，表现出超出常规预测的长期大沉降。中洼地区粘土地基原位延迟固结的发生可以用Schmertmann方法考虑试样扰动来描述。5)砂桩扩洞法改良中间土填海土地。研究结果2)也可应用于中间土。这个人工岛在改造前结构复杂，过度固结。土壤改良使土地结构松散，通常是固结的。

1) Evaluation of optimum condition of remolded samples for the determination of the elasto-plastic parameters.A optimum water content for making remolded clay is its liquid limit.2) Determination of soil properties of naturally deposited clay and sand.Soil properties of naturally deposited clay and sand can be estimated by simulating a series of process which contain soil sampling, setting in the apparatus, and laboratory testing.3) Estimation of deformation and failure of a test embankment on unusual soil ground.Research result 2) can be applied to unusual soil. The predictive simulation of circular-slip failure process of a test embankment on unusual soil ground was successful.4) Prediction of large delayed consolidation of soft clay due to embankment loading.The clay of foundation, which exhibits a long-term large settlement beyond the conventional prediction, can have sensitivity ratio of more than 8.0 and the compression index ratio Cc/Ccr, more than 1.5. The occurrence of in-situ delayed consolidation of clay foundation in Nakajo can be described by taking the sample disturbance into consideration with the Schmertmann's method.5) Improvement of reclaimed ground with intermediate soils by cavity expansion due to sand piles.Research result 2) can be also applied to intermediate soil. The manmade island is highly structured and heavily overconsolidated before improvement. The soil improvement makes the ground less structured and normally consolidated.