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水泥土-混凝土的界面特性是控制劲性复合桩竖向承载力和沉降特性的关键参数。文章设计了水泥土-混凝土制样方法,通过直剪试验研究了水泥土-混凝土界面特性,并分析了水泥土中水泥掺入量、混凝土强度等对界面特性的影响规律。试验结果表明,混凝土-水泥土破坏面位于两者交界面上;水泥土强度较低时,界面破坏模式为塑性破坏,随着水泥土强度的提高,脆性特征逐渐显现,破坏模式由塑性破坏转为脆性破坏;界面剪切强度与法向应力符合库伦定律;在一定的水泥土无侧限抗压强度范围内,界面黏聚力与水泥土无侧限抗压强度符合近似线性函数,但界面摩擦角与水泥土强度之间的相关度不密切;界面剪切强度约为水泥土无侧限抗压强度0.188倍。
The interface characteristics of cement-soil-concrete are the key parameters to control the vertical bearing capacity and settlement characteristics of the rigid composite piles. In this paper, the cement-concrete-concrete method was designed. The interface characteristics of cement-concrete were studied by direct shear test. The influence of cement content and concrete strength on the interface properties was also analyzed. The experimental results show that the failure surface of concrete-cement soil is located at the interface between the two. When the strength of cement soil is low, the failure mode of interface is plastic failure. With the increase of strength of cement soil, brittle characteristics gradually appear, and the failure mode changes from plastic failure Which is brittle failure. The interfacial shear strength and normal stress accord with Coulomb’s law. In a certain range of unconfined compressive strength of cement soil, the cohesion of interface and unconfined compressive strength of cement soil conform to an approximate linear function, but the interface The correlation between friction angle and cement soil strength is not close; the interfacial shear strength is about 0.188 times that of unconfined cement soil.