灰岩强度特性的试验分析与数学模拟  

Experimental Analysis and Mathematical Simulation on the Strength Characteristics of Limestone

作　　者：郭中华[1] 朱珍德[1] 花剑岚[1] 张爱军[1] 房震[1] 

机构地区：[1]河海大学岩土工程研究所,南京210098

出　　处：《地下空间》2001年第4期280-286,共7页Underground Space

基　　金：中国博士后自然科学基金;河海大学创新基金 (2 0 0 1 4 0 1 743)

摘　　要：以某电站所提供的灰岩岩芯为例 ,对该电站的岩芯的强度特性进行了研究 ,依据单轴压缩试验结果分别提出了风干状态下岩石的单轴抗压强度与高径比 ,自然状态、饱和状态下岩石的单轴抗压强度与横截面积之间的非线形关系式 ,该式可以很方便地在有关工程中为相似岩石估算其强度值提供参考、借鉴。天然状态下的岩石处于三向压缩状态 ,室内三轴压缩试验是岩石应力状态较为真实的反映。针对灰岩的三轴压缩试验结果 ,对其应力应变关系曲线进行了分析与比较 ,并进行了曲线拟合。结果表明 ,岩石的变形可以分为四个不同的阶段 ,围压对岩石的应力应变关系有一定影响 ,用多项式函数拟合应力应变关系曲线是比较理想的。The strength characteristics of limestone are studied in this paper. The non linear relationship between uniaxial compressive strength and the ratio of highness to diameter, and the non linear relationship between uniaxial compressive strength and cross section in natural and saturation condition are presented separately. The relationship formulas are very convenient to provide consultation and reference for evaluating the strength of the resemble rock in the related engineering. The rock under in situ conditions is always in the state of three dimensional compression, so the laboratory triaxial compression test is the relatively true reflection of the stress state of the rock. Aiming at the results of triaxial compression test, the curves of stress strain relationship of limestone are analyzed and compared and then fitted as well. The results indicate that the procedure of limestone deformation can be divided into four different stages. The stress strain relationship is affected a great deal by the lateral stress and the stress strain relationship can be fitted ideally by polynominal function. [

关 键 词：单轴压缩试验 单轴抗压强度 灰岩 三轴试验 曲线拟合 

分 类 号：TU458[建筑科学—岩土工程]