非均质土层的注浆扩散特性与加固力学行为研究  

Diffusion characteristics and reinforcement mechanics of grouting in non-homogeneous soil strata

作　　者：雷进生[1] 刘非[1] 王乾峰[1] 彭刚[1] 姜袁[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《岩土工程学报》2015年第12期2245-2253,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51279092;51278282);湖北省自然科学基金项目(2013CFB218);宜昌市科学技术研究与开发项目(A2011-302-5);三峡大学人才科研启动基金项目(KJ2014B004)

摘　　要：注浆加固区域土层具有非均质性和原位变异性,土层参数服从一定的分布规律。基于随机分形理论和物性参数关联的特点,构建非均质土层的物性参数随机分布模型。基于Delaunay方法将土层分形网格结点连接成三角形网格,利用三角形面积坐标插值方法实现土层分形网格中动态参数向注浆有限元网格的传递。应用精细化的流固耦合力学模型,考虑土体物性参数动态变化和浆液时变效应的影响进行注浆扩散模拟,分析土层物性参数动态变化规律,研究非均质土层中浆液扩散范围和结石体的真实形态。通过定义不规则结石体的物理力学参数,研究荷载作用下注浆加固地层的应力和变形分布特征。The soil layers are of non-uniform distribution and variability in the grouted region, and their parameters obey the distribution laws. Based on the random fractal theory and the characteristics of the related physical parameters, a random distribution model for the physical parameters of non homogeneous soil strata is established. The soil fractal mesh nodes are connected into triangular meshes based on the Delaunay method, using the triangle area coordinates interpolation method to achieve the soil dynamic parameters in the fractal grids to pass to the finite element mesh of grouting. Applying the fluid-solid coupling theory, considering dynamic change of physical parameters of soil and time-varying effect of slurry, the characteristics of dynamic change of the physical parameters are analyzed, and the diffusion scope and concretion shape of the slurry in non homogeneous soil strata are studied. The material parameters of irregular concretion are defined, and the characteristics of stress and deformation under loads after grouting are analyzed.

关 键 词：非均质 动态参数 流固耦合 注浆 加固 

分 类 号：TU43[建筑科学—岩土工程]