淤泥地基原位十字板剪切与单桥静力触探参数相关性研究

Study on Parameter Correlation of Vane Shear and Single Bridge Cone Penetration Test of Muck Ground

利用广州南沙某大型地基处理工程勘察资料及单桥静力触探、十字板剪切等测试数据进行分析研究,建立了适用于淤泥地基的单桥静力触探与十字板剪切参数间的经验关系并给出适用条件,其中比贯入阻力Ps和剪切强度Cu间呈线性关系,Ps与灵敏度系数St呈幂函数关系,后一关系适用于不排水抗剪强度区间为0-20k Pa,以及比贯入阻力区间为50-360k Pa的淤泥土层。此外,本文还导出了淤泥地基Ps-St半理论公式并与实测数据、经验关系进行了比较,结果表明其具有较好的适用性。本文工作对淤泥地基的常用原位实测力学参数及相互关系具有一定参考价值及借鉴性。

Based on the site investigation data,the test data of single bridge cone penetration and vane shear of one large-scale ground improvement project in Guangzhou,a muck ground applicable empirical relationship between parameters of single bridge cone penetration and vane shear test with applicable condition is established; of which the relationship between the specific penetration resistance Psand the shear strength Cuis linear,while the relationship between Psand the sensitivity coefficient Stis a power function. The latter one is applicable to be used in muck ground with the undrained shear strength of 0 - 20 k Pa,and the specific penetration resistance of 50 -360k Pa; the muck applicable half theoretical formulation of Ps-Stis also derived and compared with the test data and the empirical relationship,which appears good applicability. This paper gives a value reference to the situ mechanic test parameters and the correlations for muck ground.