天然海相中间沉积土性质研究  

Research on Behavior of Natural Marine Intermediate Deposits

作　　者：石名磊[1] 刘建华[1] 赵俊明[1] 

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《中国矿业大学学报》2005年第5期664-667,共4页Journal of China University of Mining & Technology

基　　金：江苏省交通科学研究计划项目(02Y015)

摘　　要：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qu试验有显著的改善.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.

关 键 词：粒径分布 液限 天然海相中间土 锥尖阻力 室内强度 

分 类 号：P736[天文地球—海洋地质]