考虑含水率影响的红砂岩损伤统计模型  

Statistical Damage Model of Red Sandstone with Effect of Water Ratio Considered

作　　者：胡昕[1] 洪宝宁[1] 孟云梅[2] 

机构地区：[1]河海大学岩土工程水利部重点实验室 [2]南京工程学院建筑工程学院,江苏南京211167

出　　处：《中国矿业大学学报》2007年第5期609-613,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50279008)

摘　　要：为了描述红砂岩在不同含水率条件下的力学特性,通过对不同含水率的红砂岩进行单轴压缩试验,分析了含水率变化对其强度和变形特性的影响.结果表明:含水率小于3%时,红砂岩有较高的强度;含水率大于3%时,红砂岩的强度明显降低;但含水率超过6%后,强度衰减趋势显著变缓.含水率与弹性模量及峰值强度之间呈指数函数变化,而峰值强度对应的应变随含水率变化呈线性函数变化.将试验确定的关系式作为边界条件,运用损伤统计理论和Lemaitre应变等价性假说,推导出了能反映含水率影响的红砂岩损伤统计模型.In order to describe the mechanical properties of red sandstone with different water ratios, by means of the uniaxial compression test of red sandstone with different water ratios, the effect of the water ratio on its strength characteristics and deformation behaviors were analyzed. The results show that if its water ratio is less than 3%, the red sandstone have higher strength; if its water ratio is more than 3%, its strength will cut down evidently; but if its water ratio is more than 6%, the trend of its strength retrogression slows down; the relationship between its water ratio and elastic modulus or peak stress presents the variety trend of expo- nential function; the relationship between its water ratio and peak strain presents the variety trend of linear function. Making these relations determined experimentally as boundary conditions, the statistical damage model of red sandstone with effect of water ratio was obtained using the statistical damage theory and strain-equivalence hypothesis.

关 键 词：红砂岩 含水率 损伤统计 应变等价假说 损伤变量 

分 类 号：TU411.92[建筑科学—岩土工程]