天然海相中间沉积土性质研究

天然沉积物中存在主要由粉质土或粉细砂土含黏性土构成的中间土．通过系统的室内和现场试验，明确了天然海相黏性土和天然海相中间土之间性质的不同．天然中间土天然含水量与液限之比几乎与软质天然海相黏土相似，但是前者相对后者的灵敏度和现场强度更高．粒度分布对锥尖阻力有显著的影响．由于高灵敏度和相对大的渗透性，试样的扰动更加显著地影响了天然海相中间土的力学参数．无侧限抗压强度试验，显著低估了天然海相中间土的强度，而简易三轴固结再压缩剪切试验相对无侧限抗压强度qo试验有显著的改善。

Research on Behavior of Natural Marine Intermediate Deposits

Coastal structures may encounter natural ground composed of intermediate soils, which mainly consist of silty soils and fine sandy soils. Extensive field and laboratory tests were performed on the natural marine intermediate soils to make clear the difference in behavior between natural marine clayey soils and natural marine intermediate soils. The natural intermediate soils have almost the same ratios of natural water content to liquid limit as those of the soft natural marine clays, but the former have much higher the in-situ strength and sensitivity than the latter. Grain size distribution affects significantly field tip resistance. The mechanical parameters of natural marine intermediate soils are also significantly affected by sample disturbance due to high sensitivity and relatively large permeability. Unconfined compression shear tests seriously underestimate the strength of natural marine intermediate soils. The triaxial equivalently-in-situ consolidated compression shear tests improve much the qo tests.