柱状节理岩体横观各向同性本构关系研究  

Transversely isotropic constitutive properties of a columnar jointed rock mass

作　　者：狄圣杰[1] 徐卫亚[1] 王伟[1] 石安池[2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室岩土工程科学研究所,江苏南京210098 [2]中国水电工程顾问集团华东勘测设计研究院,浙江杭州310014

出　　处：《中国矿业大学学报》2011年第6期881-887,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金和法国国家科研署联合基金项目(50911130366);国家自然科学基金项目(50979030)

摘　　要：采用复合材料力学方法,针对柱状节理岩体考虑节理交错、层内错动带及柱轴偏转等因素建立了横观各向同性本构模型,对其等效弹性参数进行了系统分析,并根据某拟建水电站坝址区玄武岩体原位试验资料,探讨了层内错动带和节理等因素对弹性参数的影响.研究表明:坝址区分布的层内错动带对柱状节理岩体弹性参数影响较大,在垂直于层内错动带方向上弹性模量减小了50%以上;柱状节理倾角影响也比较明显,在倾角为15°时,等效弹性模量下降低约19%.该方法可以完善描述柱状节理岩体各向异性变形特征和规律,揭示了原位测试水平向弹性模量大于铅直向的原因.A constitutive model of a transversely isotropic,columnar jointed rock mass is presented.The methods of composite material mechanics were used to consider staggered joints,inner disturbed belts,coordinate deflection,and other factors.Equivalent elastic parameters were calculated from the model.An in situ test at a dam for a hydro-power station showed the impact of the inner disturbed belts and of the joints of a columnar jointed rock mass.It appears that the inner disturbed belts have a large effect upon the elastic parameters of the columnar jointed basaltic mass located at the dam site.This impact reduces the elastic modulus more than 50% in the vertical direction.The effect of dip angle is obvious.In this case the dip angle is 15 degrees and so the equivalent vertical elastic modulus is reduced by about 19%.This approach allows an improved description of the anisotropic columnar jointed rock mass.The field application shows the horizontal elastic modulus is larger than the vertical elastic modulus.

关 键 词：柱状节理 横观各向同性 本构关系 等效弹性参数 

分 类 号：TU45[建筑科学—岩土工程]