低掺量水泥土抗剪强度试验研究

利用静三轴CU试验研究了水泥掺入比低于5%的低掺量水泥土的应力-应变关系及强度特性, 探讨了在不同水泥掺量情况下水泥土抗剪强度指标的变化规律, 分析了素土和水泥土的变形破坏模式。试验结果表明, 水泥土强度随水泥掺量增加而提高, 当水泥掺入比大于1.5%时, 水泥土的强度和抵抗变形的能力较素土有显著的增强。研究结果对于深入认识低掺量水泥土的加固机理和现场施工合理选择水泥掺入比具有指导意义。

Experimental Study on Shear Strength of Soft Soil Treated with Low-content Cement

Laboratory CU tri-axial tests were carried out so as to understand the stress-strain relationship and strength property of soft soils treated with cement ratio of less than 5%. The change rule of shear strength indexes of cement-reinforced soils with different cement ratio in the soil samples was investigated. The failure modes of reinforced and unreinforced soils were discussed. The laboratory test results show that addition of cement can improve effectively the mechanical properties of soft soils. The shear strength of cement soil increases with the increasing of cement dosage added. When cement ratio is greater than 1.5%, the strength and the capacity for resisting the deformation of cement-reinforced soils increase remarkably. The research results are of importance for understanding the strengthening mechanism and determining suitable cement ratio in construction.