CAJ | 학술논문

我国海域普遍分布有迭层土，由于结构的特殊性，对于其性质的准确把握，直接影响到海洋工程诸如打桩、钻井船插深等问题预测的准确性，关系到海洋工程建设的安全。现场进行孔压静力触探 CPTU 试验以及室内试验，分析我国南海海域迭层土的物理、力学性质的特点，对迭层土抗剪强度值的确定进行探讨。CPTU 试验数据显示，迭层土的物理力学性质与单一土层具有较明显的差异；由于迭层土中砂层的存在，室内三轴不排水剪切试验（UU 试验）确定的不排水强度明显偏低，是 CPTU 确定的不排水抗剪强度的下限值。CPTU 的结果可以较好地反映了迭层土的特点，根据 CPTU 试验结果得到的摩阻比变化范围较大，在0～8之间远大于一般的砂土或黏土的变化范围，摩阻比与修正端阻之间的关系可用双曲线近似表示。建议进行静力分析时，迭层土不排水抗剪强度参数选取应参考 CPTU 试验结果。
아국해역보편분포유질층토，유우결구적특수성，대우기성질적준학파악，직접영향도해양공정제여타장、찬정선삽심등문제예측적준학성，관계도해양공정건설적안전。현장진행공압정력촉탐 CPTU 시험이급실내시험，분석아국남해해역질층토적물리、역학성질적특점，대질층토항전강도치적학정진행탐토。CPTU 시험수거현시，질층토적물리역학성질여단일토층구유교명현적차이；유우질층토중사층적존재，실내삼축불배수전절시험（UU 시험）학정적불배수강도명현편저，시 CPTU 학정적불배수항전강도적하한치。CPTU 적결과가이교호지반영료질층토적특점，근거 CPTU 시험결과득도적마조비변화범위교대，재0～8지간원대우일반적사토혹점토적변화범위，마조비여수정단조지간적관계가용쌍곡선근사표시。건의진행정력분석시，질층토불배수항전강도삼수선취응삼고 CPTU 시험결과。
Laminated soil distributes widely in the sea around China. Due to its special fabric, its physico-mechanical properties are different from the normal soil which will affect prediction of pile driving, spudcan penetration. In this paper, field piezocone penetration test(CPTU) and laboratory test methods are used to analyze the physico-mechanical properties of laminated soil in South China Sea; and the shear strength of laminated soil is discussed. The test results show that the physico-mechanical properties of laminated soil are different from normal sand’s or clay’s ones. Since the sand lamination presence, the undrained shear strength of laminated soil getting from UU tests is conservative; and it is the lower limit of that got from CPTU. The results of CPTU could show the special characteristics of laminated soil more clearly. The change scale of friction ratio of laminated soil got from CPTU is from 0 to 8 which is much larger than that of normal sand and clay. The relationship between friction ratio and corrected cone resistance could be simulated with hyperbola approximately. The special characteristics of laminated soil should be considered when the undrained shear strength is determined in static analysis properly.