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采用麦秸秆与石灰共同加筋固化滨海盐渍土,可解决由于盐胀、溶陷和吸湿软化引起的土体强度下降问题。首先,制备盐渍土、石灰土、麦秸秆加筋盐渍土和麦秸秆加筋石灰土试样(整体均匀加筋、上部均匀加筋和下部均匀加筋);进而,进行φ50 mm试样、φ152 mm重型击实试样和φ102 mm轻型击实试样的无侧限抗压强度试验,以及φ61.8 mm试样三轴压缩试验;最后,分析抗压强度增长率、主应力差比值和黏聚力增长率的变化规律,以评价麦秸秆的加筋效果。结果表明:①麦秸秆加筋增强了土的抗压强度和抗变形能力。②麦秸秆加筋提高了土的黏聚力,在试样下部加筋,加筋效果更好。③加筋石灰土的强度由麦秸秆和石灰共同承担,加筋石灰土的浸水稳定性来源于石灰的固化作用。④低围压时,加筋对土的侧向变形约束较强;高围压时,加筋和围压共同限制土的侧向变形。采用麦秸秆加筋是滨海盐渍土的一种有效处理方法。
Adopting wheat straw and lime together to reinforce coastal saline soil can solve the problem of soil strength reduction caused by salt expansion, dissolution and moisture absorption and softening. First, samples of saline soil, lime soil, wheat straw-reinforced saline soil and wheat straw-reinforced lime soil were prepared (uniformly homogeneously stiffened, homogeneously stiffened at the upper portion and uniformly stiffened at the lower portion); furthermore, specimens of φ50 mm , Φ152 mm heavy compaction specimen and φ102 mm light compaction specimen unconfined compressive strength test, and φ61.8 mm specimen triaxial compression test; Finally, analysis of compressive strength growth rate, the ratio of the main stress difference And cohesion growth rate changes to evaluate the effect of wheat straw reinforcement. The results showed that: ① wheat straw reinforced soil compressive strength and deformation resistance. ② wheat straw reinforced soil cohesion increased in the lower part of the sample, reinforced better. (3) The strength of reinforced limestone soil is shared by wheat straw and lime, and the stability of reinforced limestone soil is due to the solidification effect of lime. (4) When the confining pressure is low, the reinforcement has a strong restraint on the lateral deformation of the soil. When the confining pressure is high, the lateral deformation of the soil is limited by the reinforcement and confining pressure. Wheat straw reinforcement is an effective treatment of coastal saline soil.