季冻区水泥土的强度预测模型与变形特征

为了研究季冻区水泥土的强度与变形特征,推动其在寒区设施农业与新农村建设中的应用,以内蒙古黄河灌区周边典型的粉砂土为主要骨料,以硅酸盐水泥为胶凝材料,采用机械压实和人工击实方法分别制作了高径比为1和2的圆柱体试件,利用WDW-50微机控制电子式万能试验机开展单轴抗压室内试验。对比研究了两种成型试件的强度变化规律,建立了相应的强度预测模型；并对其破坏形态、破坏应变和变形模量开展了分析。试验结果表明：两组成型试样具有相似的强度变化规律,强度预测模型的建立需要精细化研究；高径比与水泥掺量的变化对破坏形态、破坏应变影响很大,试样的变形模量与无侧抗压强度基本满足线性关系。

Strength prediction mode and deformation characteristics analysis of cement soil in seasonal frozen area

In order to study the strength and deformation characteristics of cement soil in the seasonal frozen area, and promote its application in the construction of facilities agriculture and new rural construction in the cold zone, using the typical silty soil of the Yellow River irrigation area around Inner Mongolia as aggregate, Portland cement as cementing materials, and cylinder specimens for cement soil, which high diameter ratio equals 1 and 2, were prepared respectively by mechanical compaction and artificial compaction method. Unconfined compression indoor tests were conducted by using a microcomputer-controlled electronic universal testing machine WDW-50. The intensity change law of the two forming test pieces was studied by comparison, and the corresponding strength prediction model was established, and the destructive form, damage strain and deformation modulus were analyzed. The experimental results show that the two-component samples were similar strength variation laws, and the establishment of the strength prediction model requires fine study. The change of high diameter ratio and cement content were a great influence on the destruction pattern and damage strain, and the deformation modulus of the specimen and the unconfined compression strength (UCS) basically meet the linear relationship.