海相淤泥水泥土变形特性试验研究

Experimental study on deformation characteristics of marine silt soil-cement

选取典型海相淤泥为研究对象,开展了不同水泥掺入量不同龄期淤泥水泥土的无侧限抗压强度试验和有侧限压缩试验,分析了淤泥水泥土的变形特征及不同变形指标之间的换算关系。结果表明:淤泥水泥土具有明显的弹塑性变形特征;弹性模量随着龄期和无侧限抗压强度的增大而增大,均呈线性相关性,弹性模量可取为无侧限抗压强度的120~150倍;水泥土孔隙比-压力曲线的孔隙比变化范围明显较淤泥小,压缩性减小,压缩模量提高,沉降计算时应根据实际压力选取相应区段的压缩模量;压缩模量(E_(s,1-2),E_(s,2-4))随着弹性模量(E)的增大而增大,两者具有很好的线性相关性,换算时可取E/E_(s,1-2)=9.5,E/E_(s,2-4)=5.5。

The unconfined compressive strength test and the confined compression test of silt soil-cement with different cement content and different ages were carried out by selecting typical marine silt as the research object.The deformation characteristics of silt soil-cement and the conversion relationship between different deformation indexes were analyzed.The results show that the silt soil-cement has obvious elastoplastic deformation characteristics.The elastic modulus increases linearly with the increase of age and unconfined compressive strength,showing a linear correlation.The elastic modulus can be 120~150 times of unconfined compressive strength.The variation range of pore ratio in the pore ratio-pressure curve of soil-cement is obviously smaller than that of silt,the compressibility reduces and the compression modulus increases,so the compression modulus of corresponding section should be selected according to the actual pressure in settlement calculation.The compression modulus(E_(s,1-2),E_(s,2-4))increases with the increase of elastic modulus(E),and the two have a good linear correlation.When converting,we can take E/E_(s,1-2)=9.5,E/E_(s,2-4)=5.5.