人工制备结构性土抗剪强度试验研究

Experimental study on shear strength of artificially prepared structural soil

通过在原料土中加入水泥和食盐颗粒制备人工结构性软土和结构性砂土,开展直接剪切试验,研究土体结构性对抗剪强度指标的影响,并分析其影响规律,结果表明:(1)结构性土的抗剪强度相较于重塑土提高明显,结构性软土c值和φ值均有显著提高,而结构性砂土抗剪强度的增加主要是由于c值的增加引起的,φ值的影响较小;(2)考虑土体的结构性,结构性软土抗剪强度指标c值和φ值相较于重塑土分别增长了64.7%和39.2%,且随着土体孔隙比的增加其增长趋势越发明显;(3)结构性砂土的抗剪强度指标c值和φ值相较于重塑土分别增加了39.63 kPa和6.6%,且密实度越大,c值增长越明显,而φ值的增加不受相对密实度的影响。

By adding cement and salt particles into raw soil to prepare artificial structured soft soil and structured sand,direct shear tests were carried out to study the influence of soil structure on shear strength index and analyze its influence law,The results show that:(1)the shear strength of structural soil is significantly higher than that of remolded soil,and the c value andφvalue of structural soft soil are significantly higher than that of remolded soil,while the increase of shear strength of structural sand is mainly caused by the increase of c value,and the influence ofφvalue is small;(2)considering the structure of soil,the c value andφvalue of structural soft soil increase by 64.7%compared with remolded soil;(3)compared with remolded soil,the shear strength indexes of structural sand increased by 39.63kpa and 6.6%,respectively,and the higher the compactness,the more obvious the increase of c value,while the increase ofφvalue was not affected by relative compactness.