Q_2黄土的结构损伤演化分析  

Structural damage development of Q_2 loess

作　　者：谢星[1] 赵法锁[2] 王东红[3] 

机构地区：[1]长安大学地球科学与国土资源学院,陕西西安710054 [2]长安大学地质工程研究所,陕西西安710054 [3]机械工业勘察设计研究院测试中心,陕西西安710043

出　　处：《西安科技大学学报》2007年第1期78-82,88,共6页Journal of Xi’an University of Science and Technology

基　　金：科技部科研基金(2002CCC00200)

摘　　要：通过西安地区不同含水量的Q2黄土的单轴无侧限压缩试验研究表明,Q2原状黄土的单轴应力应变关系呈强软化型,峰值强度前曲线近似呈线形,峰值强度后的指数型应力应变关系可以用含损伤变量的线弹性本构方程描述。对应力应变门槛值及损伤演化规律的分析和探讨认为:损伤的应变门槛值εc几乎不随着含水量的变化而变化,而损伤的应力门槛值σS及初始弹性模量E0则随着含水量的增加分别呈指数和线性减少;以强度劣化和刚度劣化来描述的损伤均适用于描述水敏性Q2黄土的损伤演化。The uniaxial compressive test results of Q2 loess in various water content in Xi＇ an show the strain-stress relationships of Q2 natural loess is strain-soften type. The curve of pest-peak strergth is nearlinear. The exponential function type curve of pre-peak strength can be described by linear elastic equation including damage variable. Although the strain damage threshold εe is fixed, the stress damage threshold σ, and initial modulus of elasticity E0 are exponential and linear decreased with the increasing of water content. The study result shows the loess damage law which is described by strength and the rigidity degradation are all proper to the Q2 loess.

关 键 词：Q2黄土 损伤演化规律 结构强度 

分 类 号：TU411.3[建筑科学—岩土工程]