双桥静力触探确定第四系滨海相黏性土不排水抗剪强度

Determination of Undrained Shear Strength of Quaternary Coastal Cohesive Soil by CPT

第四系滨海相黏性土的力学参数具有空间随机分布和变异性等规律,静力触探试验作为应用最为广泛的原位测试方法之一,在确定第四系滨海相黏性土不排水抗剪强度方面具有明显优势。依托盐城市滨海县滨海港工业园区岩土工程勘察,采用回归分析方法,建立静力触探试验与室内试验中不同试验方法获取的不排水抗剪强度之间的相关关系,研究表明,随着净锥尖阻力的增加,黏性土的不排水抗剪强度呈线性增加,采用不同的理论圆锥系数能够较好地拟合室内试验不同方法获取的抗剪强度参数,且理论圆锥系数范围在13.25~22.93之间。

The parameters of the Quaternary marine originated cohesive soil have the characteristics of random spatial distribution and variability,so it is important to obtain the accurate strength parameters in geotechnical investigations.As one of the most widely used in-situ methods,cone penetration test(CPT)has obvious advantages in determining the undrained shear strength of quaternary coastal cohesive soils.Based on the geotechnical engineering investigation of Binhai Port Industrial Park,Binhai County,Yancheng City,this paper uses regression analysis to establish the correlation between the undrained shear strength obtained by CPT and different laboratory tests.The research results show that the undrained shear strength of cohesive soil increases linearly with net cone resistance,and different theoretical cone coefficients are adopted.The theoretical cone coefficient range is between 13.25 and 22.93.