lemaitre meaning in English
莱迈特雷
勒迈特
勒梅特
Examples
- Erosion damage decreases rock load area , after defining damage variable , the damage stress in rock can be calculated by the method bring forward by lemaitre conveniently . for surrounding rock of a deep buried tunnel under the condition of drained , its seepage character is not only controlled by the high stress in rock , but also influenced by the development of erosion damage . in the whole course of rock " s deformation and failure , its seepage character decreases with the increment of stress in elastic stage , while " increases with the development of failure
岩样中全应力?应变三轴渗透试验过程中的典型表现为随着应力的增加，岩体内的空隙和裂纹受载闭合，渗透性降低，应力达到一定阈西南交通大学鹰士研究生学位论文第11页值后，岩体内部裂纹发生扩展和归并，渗透性增强；同样，地下水的动、静压力作用对裂纹的扩展和归并也起着促进作用。 - ( 2 ) because of t he variability of rock subjected to outside action , three new conceptions : postive damage basic damage and negative damage , are suggested , which can deal with the condition that rock density became large . ( 3 ) the present damage variables based on ct number mostly include ct average number of the rock without damage , which is difficult to measure , so a new damage variable , which includes the average ct number is proposed , on the other hand , strain equal theory is generalized because the one put foreword by lemaitre is not good enough to use . ( 4 ) a axial damage constitutive equation is proposed and testified . ( 5 ) with the circle times , the damage propagation laws of two different rocks , subjected to circle of freezing and thawing , are studied , and in the analysis process , traditional analysis method including average ct number and is used , some important conclusions are reached : inner damage of soft rock containing a large mount of apertures is largely propagating with the time increasement of circle , however , at the preliminary time , the hard rock containing a small mount of aperture is a little propagating , at late time , the influence become large ; ( 6 ) zone separation and statistics frequency put forward is used to analysized the three different damage propagation in the open circumstance , when they are subjected to the different circle times of freezing and thawing , in which the temperature variability is linear , different freezing rate , and different freezing temperature , and no water is supplied during the test
在研究过程中本文主要做了以下工作： ( 1 )针对岩石损伤变化较小时，运用ct均值和方差分析不方便的缺陷，本文提出运用对ct数范围划分区段的方法，根据各区段统计频率的变化规律来分析损伤扩展状况； ( 2 )针对岩石受到外部作用的多变性，本文提出了基准损伤，正损伤，负损伤的概念，在某种程度上考虑了岩石受到外部作用时的压密情况； ( 3 )现有的基于ct数的损伤变量大多需要用到岩石基体的ct均值，这实际上是很难观测到的，因此本文建议了一个可运用岩石初始状态ct均值的损伤变量，由于现有的勒迈特教授应变等价原理使用上的不便，本文在其基础上进行了推广； ( 4 )建议了一个可用岩石初始状态ct数和弹性模量的单轴损伤本构方程，并用算例进行了验证； ( 5 )对两种不同岩石在开放环境下受到冻融循环作用且融化过程中补水时，内部损伤随冻融循环次数增加的扩展规律进行了探讨，主要运用了常规的ct均值和ct方差的分析方法进行分析，试验发现：对于孔隙率和含水率较高，密度和强度较低的软弱岩石，冻融循环次数对损伤结构的扩展有明显的影响，而对于孔隙率和含水率较低，密度和强度较高的硬岩，冻融循环次数对其损伤结构扩展初期由于含水率低的原因，影响不是太大，而后期由于水补给后，含水率较高的原因，冻融影响逐渐增大； ( 6 )运用了本文提出的区段划分和统计频率的方法，深入地分析了开放环境下的线性温度变化的冻融循环次数，冻结温度，冻结速度不同岩石作用时，其内部损伤随冻融循环次数，冻结速度和冻结温度变化的扩展规律，需要指出的是除了在试验前饱水外，冻融过程中没有补水。