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

1)重塑土的最佳含水量是其液限。2）天然沉积粘土和砂的土壤性质的测定。通过模拟土壤取样、放置在仪器中、测定土壤性质的一系列过程，可以估计天然沉积粘土和砂的土壤性质。3）对某特殊地基上路堤的变形破坏进行了估算，研究结果2）可应用于特殊地基。4）路堤荷载作用下软粘土的大滞后固结预测：软粘土地基的长期大沉降超过常规预测，敏感性比可达8.0以上，压缩指数比Cc/Ccr可达1.5以上。中条地区粘土地基原位延迟固结现象的发生，可以用Schmertmann方法考虑试样扰动进行描述。5）砂桩扩孔改良中间土填筑地基研究结果2）也适用于中间土。人工岛在改善前高度结构化，严重过度固结。土壤改良使地面结构化程度较低，通常情况下是固结的。

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.