固结度对长江漫滩相软土抗剪强度的影响

Effect of consolidation degree on shear strength of soft soil of Yangtze River floodplain facies

为探究长江漫滩相软土的抗剪强度特征,采用静三轴仪对南京长江漫滩相原状软土进行一系列试验,探讨不同固结条件下漫滩相软土抗剪强度的变化规律。结果表明:当固结度在60%~100%时,增大初始有效围压可在一定程度上提高抗剪强度;在相同围压下,抗剪强度随固结度的增加均规律性增大。以完全固结时的抗剪强度值τ_(f,100%)为参考,给出不同固结度下τ_(f)对应的折减系数,同时分别给出内摩擦角和黏聚力随固结度的变化关系,为长江漫滩区建设工程地基设计与施工提供参考依据。

In order to explore the shear strength characteristics of the Yangtze River floodplain facies soft soil,a series of experimental studies were carried out on the undisturbed Yangtze River floodplain soft soil in Nanjing section using the static triaxial apparatus,and the changing law of its shear strength under different consolidation conditions was explored.The test results show that when the consolidation degree is between 60% and 100%,increasing the initial effective confining pressure can increase the shear strength to a certain extent;under different initial effective confining pressures,the shear strength increases regularly with the increase of the degree of consolidation.Taking the shear strength value τ_(f,100%) at the time of complete consolidation as a reference,the corresponding reduction coefficients of τ_(f )under different consolidation degrees were given,and the relationship between internal friction angle and cohesion with the degree of consolidation was given respectively,thus to provide references for foundation design and construction of building projects in Yangtze River floodplain area.