岩土力学2012，Vol.33Issue(3)：957-960,4.
现场软土欠固结程度孔压消散试验评价方法
Degree of underconsolidation determination method of in-situ soft soil through pore pressure dissipation test
摘要
Abstract
Stress history of soft soil analyzed by in-situ test technology can avoid the structural disturbance of soils during sampling and laboratory experiments, and better reflect their real property. Traditional overconsolidation ratio (OCR) calculation methods of cone penetration test with pore pressure measurement (CPTU) technology are mainly based on overconsolidated soils and lack consideration of those soils under the condition of underconsolidated state. Therefore, it shows certain limitations in practical application. Based on literature review, a consolidation state evaluation method is introduced in detail. First, the in-situ initial pore pressure is deduced through final part of the incomplete pore pressure dissipation test curve together with the extrapolation method of inverse time square root of time. It means that there exists inherent pore pressure if the initial pore pressure is greater than hydrostatic pressure; and the soil is underconsolidated. Then, the degree of underconsolidation of soft soil can be quantitatively evaluated by calculating the parameter of consolidation state. Engineering application indicates that the method is not only reasonable but feasible, and can be widely used without limitation of soil property and region. The method can effectively determine the consolidation degree of soft soil without any laboratory consolidation test. The research achievement is instructive for reasonable engineering property assessment of underconsolidated soft soils.关键词
孔压静力触探/消散试验/固有孔压/固结状态参数Key words
piezocone penetration test (CPTU)/ dissipation test/ inherent pore pressure/ parameter of consolidation state分类
建筑与水利引用本文复制引用
居俊,刘松玉,刘志彬,蔡国军..现场软土欠固结程度孔压消散试验评价方法[J].岩土力学,2012,33(3):957-960,4.基金项目
国家自然科学基金资助项目(No.40702047) （No.40702047）
江苏省交通厅资助项目(No.09Y33) （No.09Y33）
东南大学优秀博士论文基金(No.YBJJ1117). （No.YBJJ1117）
