孔压静力触探测定土体抗剪强度的应用

Application of CPTU in Determining the Shear Strength of Soil

本文以泉州市城东镇某工程项目为研究背景,通过分析CPTU测试获取的相关数据并结合十字板剪切试验明确孔压圆锥系数与孔压参数比两者之间的联系,并在此基础上建立CPTU参数与黏性土不排水抗剪强度的关系。结果表明,采用CPTU测试方法得到的试验数据更精确更可靠。孔压参数比与NΔu呈正相关,公式与实测值的拟合度高达0.92,超静水压的差值越大,土体的抗剪强度越大,反算求解得到孔压圆锥系数为8.62时的计算数值,与十字板试验得到的数值拟合高达0.88,两者具有较高的吻合度。

This article takes a certain engineering project in Chengdong Town,Quanzhou City as the research background.By analyzing the relevant data obtained from CPTU testing and combining it with the vane shear test,the relationship between the pore pressure cone coefficient and the pore pressure parameter ratio is clarified.On this basis,the relationship between CPTU parameters and the undrained shear strength of cohesive soil is established.The results indicate that the experimental data obtained using the CPTU testing method is more accurate and reliable.There is a positive correlation between pore pressure parameter ratio and NΔu and the fitting degree between the formula and the measured value is as high as 0.92.The larger the difference in excess static water pressure,the greater the shear strength of the soil.The calculated value when the pore pressure cone coefficient is 8.62 is obtained through reverse calculation,and the fitting degree with the value obtained from the vane test is as high as 0.88,indicating a high degree of agreement between the two.