CAJ | 학술논문

近年来许多研究者致力于通过孔压静力触探(CPTU)确定土体的渗透系数，但是存在偏差大，而且不能从机制上清楚地解释孔压静力触探确定土体渗透系数的原因。为了应用孔压静力触探现场快速地确定土体的渗透系数，在总结前人对孔压静力触探确定土体渗透系数方法的研究基础上，提出孔压静力触探时锥头处呈球冠形孔隙水流动的计算模型，假定锥头处初始超孔隙水压力为负指数型分布，推导出土体渗透系数的表达式，并且结合现场实测数据，将所提出的方法与已有的方法进行对比分析。研究发现：所提出的方法扩大了现有方法的应用范围；渗透系数计算结果受锥头角度的影响较大，随着锥头角度的增大而增大；针对国际上通用的60°角的标准锥头，所提出的方法计算的渗透系数大于前人的方法，而且更接近室内外试验结果。
근년래허다연구자치력우통과공압정력촉탐(CPTU)학정토체적삼투계수，단시존재편차대，이차불능종궤제상청초지해석공압정력촉탐학정토체삼투계수적원인。위료응용공압정력촉탐현장쾌속지학정토체적삼투계수，재총결전인대공압정력촉탐학정토체삼투계수방법적연구기출상，제출공압정력촉탐시추두처정구관형공극수류동적계산모형，가정추두처초시초공극수압력위부지수형분포，추도출토체삼투계수적표체식，병차결합현장실측수거，장소제출적방법여이유적방법진행대비분석。연구발현：소제출적방법확대료현유방법적응용범위；삼투계수계산결과수추두각도적영향교대，수착추두각도적증대이증대；침대국제상통용적60°각적표준추두，소제출적방법계산적삼투계수대우전인적방법，이차경접근실내외시험결과。
Efforts have been made to estimate permeability coefficient of soil using cone penetration test with pore pressure measurement (CPTU) in recent years. However, there are large deviations for the current approaches. Moreover, the mechanism of permeability coefficient determined by CPTU can not be explained explicitly. In order to directly determine the permeability coefficient of soil by CPTU in the field, two assumptions are proposed:i) the flow surface area for pore water is assumed to be a spherical crown covered the tip of the cone;ii) negative exponent distribution of initial excess pore water pressure during CPTU is assumed. Based on these two assumptions and the previous approaches for evaluating the permeability coefficient of soil using CPTU, the equation to calculate the permeability coefficient of soil is derived. According to the measured data in the field, the comparison is made between the proposed approach and the existing one. The results show that the proposed modified approach extends the range of the application of existing approaches. The permeability coefficient of soil is influenced by the degree of the tip of the cone greatly, which increases with the increasing of the degree of the tip. For a cone penetrometer with 60 degrees accepted as the reference and specified in the international reference test procedure, the permeability coefficient determined by the proposed approach is larger than that of previous approaches and more close to that of lab and field tests.