摘要
试验表明水泥土中掺入适量的纳米硅材料可以大幅度地提高水泥土的抗压强度。在试验的基础上,得出纳米硅水泥土的屈服条件后,采用相关联的流动法则和塑性功硬化条件,建立了纳米硅水泥土的弹塑性本构关系方程。在此基础上,以空间轴对称为研究对象,采用三角形截面的圆环单元,应用虚功原理建立了轴对称条件下纳米硅水泥土有限元方程,用增量刚度法求解,且用Matlab软件编制了有限元程序,在三轴试验条件下验证了该程序的合理性。以某机场水泥土搅拌桩地基处理方法作为工程背景,应用不同纳米硅掺量的水泥土作为地基处理的新材料,与传统水泥土进行了比较,计算结果表明,纳米硅作为水泥土外加剂用于地基处理可有效地减少地基沉降,提高地基承载力,在相同上覆压力下纳米硅水泥土处理后的地基沉降小于普通水泥土材料。
Tests show adding propriety nanometer silicon to cement-stabilized soils can improve compressive strength of cement-stabilized soils greatly. Based on tests, constitutive model of nanometer silicon and cement-stabilized soils is proposed by using the yield criterion attained by tests, related flow rules and plastic work hardening rules. The authors deduce finite element equations in conditions of spatial axisymmetry applying means of incremental stiffness by use of annulus element of triangular cross-section and principle of virtual work; and give Matlab programs; and the rationality of programs is verified by triaxial tests. Regarded as new kind of geotechnical material, nanometer silicon and cement-stabilized soils are used in ground improvement in airfield project in stead of routine cement-stabilized, and compared its use with routine cement-stabilized soils. The results show that nanometer silicon and cement-stabilized soils can decrease ground settlement and improve ground bearing capacity. Born on the same overlying pressure, the settlement of nanometer silicon and cement-stabilized soils is less than that of routine cement-stabilized soils.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第1期143-146,共4页
Rock and Soil Mechanics
关键词
纳米
水泥土
弹塑性
有限元
nanometer
cement-stabilized soils
elastoplasticity
finite elements
