双台子河口浅海相粉土承载力特征

Bearing Capacity of Neritic Facies Silt from Shuangtaizi River Estuary

双台子河口浅海相地层以粉土受物质组成、沉积环境影响,垂向上物理力学性质复杂多变,对海洋工程尤其是海洋钻井平台的安全存在显著影响。本研究以双台子河口一工程地质钻孔为例,结合海洋钻井平台实际插桩结果,对粉土层的桩基承载力特征进行了分析讨论,认为粉土层的力学性质差异是由于海平面阶梯状上升所导致,其力学参数选取应参考含水量、空隙比、粒度组分以及现场原位测试结果确定。

Effected by the silt composition and the sedimentation environments,the vertical mechanical characteristics are complicated and varied in the neritic facies silt stratum of the Shuangtaizi River estuary,which might influence the safety in marine engineering,especially in the drilling operation on a platform.An engineering geological borehole in the Shuangtaizi River estuary is used as an example in this study and combined with the practical pilings for the marine drilling platform to analyze and discuss the bearing capacity characteristics of the silt stratum for the pilings.It is believed that the mechanical characteristic variability in the silt stratum results from the sea level stairstep rising.The machanical parameters for the silt can be determined from the water content in the silt,the porosity ratio,the grain-size composition,and the in situ test.