分级加载下薄层状岩石蠕变特性研究  

STUDY OF CREEP PROPERTIES OF THINLY LAMINATED ROCK UNDER STEP LOADING

作　　者：韩庚友[1,2] 王思敬[1] 张晓平[1,2] 王彦兵[1] 赵国斌[1] 马超锋[1] 

机构地区：[1]中国科学院工程地质力学重点实验室中国科学院地质与地球物理研究所,北京100029 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《岩石力学与工程学报》2010年第11期2239-2247,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室资助课题(Z110808);国家重点基础研究发展计划(973)项目(2010CB731501;2009CB724605)

摘　　要：为研究丹巴水电站薄层状岩石二云石英片岩的蠕变特性,在RLW–2000微机控制岩石三轴蠕变试验机上对试样进行加载方向分别为平行片理面(0)°、垂直片理面(90)°及与片理面成30°夹角3个方向的单轴蠕变试验。基于试验结果,研究不同加载方向的蠕变规律;分析片理面对二云石英片岩蠕变的影响。根据蠕变曲线的特征,采用改进的西原模型对二云石英片岩蠕变进行辨识,并根据试样的蠕变试验数据拟合出改进的西原模型参数,拟合结果与试验数据比较吻合。同时,试验结果还表明,3种加载方向的长期强度为对应单轴抗压强度的0.6～0.7倍,这些结论对今后丹巴水电站二云石英片岩的研究具有重要的指导意义。In order to study the creep properties of mica-quartz schist which belongs to thinly laminated rock in Danba hydropower station,uniaxial creep tests of mica-quartz schist specimens which the loading directions are parallel（0°）,perpendicular and 30° to schistosity planes are performed with the computer controlled triaxial creep test machine RLW–2000.Based on the test results,the creep laws of different orientations are investigated.Then,the effects of schistosity planes on creep laws of mica-quartz schist are analyzed.According to the characteristics of creep curves,the modified Nishihara model is used to identify the creep of mica-quartz schist;the parameters of modified Nishihara model are obtained by fitting the data of creep tests;and the fitting results coincide with the test data.Furthermore,the test results reveal that the long-term strength of mica-quartz schist in three loading directions is 60%–70% of uniaxial compressive strength.These studies can provide an important guidance for future study of mica-quartz schist in Danba hydropower station.

关 键 词：岩石力学 薄层状岩石 蠕变特性 二云石英片岩 片理面 

分 类 号：TU45[建筑科学—岩土工程]