锦屏绿片岩分级卸荷流变规律研究  

Study on Rheological Rules of Greenschist in Jinping Hydropower Station under Condition of Step Unloading

作　　者：石振明[1,2] 张力[1,3] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]上海广联建设发展有限公司,上海200438 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《地下空间与工程学报》2010年第4期756-762,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金委员会;二滩水电开发有限公司雅砻江水电开发联合研究基金项目(50579088;50639090)

摘　　要：利用TLW-2000岩石三轴蠕变试验机对锦屏二级水电站辅助洞的绿片岩进行恒定轴压分级卸围压应力路径下的三轴蠕变试验。本文介绍了整个试验过程,描述和分析了绿片岩轴向与侧向蠕变规律。分析了绿片岩各向受力条件对其轴向和侧向流变特性的影响。结果表明:锦屏绿片岩在平行片理方向和垂直片理方向有较大差异性,在以偏应力为主导因素的外力作用下,侧向表现出比轴向更为突出的流变特性。针对工程实际,利用一维Burgers模型求取绿片岩平行片理方向的流变参数。利用Burgers模型得到的曲线与试样在侧向流变数据可较好拟合,该模型适合描述绿片岩在平行片理方向上的弹—黏弹性流变特征,研究得到的三轴蠕变参数也可为锦屏二级水电站提供参考值。Triaxial creep test was carried out on greenschist specimens from auxiliary tunnel of Jinping II Hydropower Station.The test was carried out under the condition of step unloading lateral stress and constant axial stress.The test process is introduced and the axial and lateral creep properties of the greenschist are described.The influence of the axial and lateral creep properties of the greenschist are analyzed under different stresses.The results show that there are big difference between the axial and lateral orientation of the greenschist and the rheological characteristic of the lateral is more prominent than the axial.At last,in view of the project reality,rheological parameters of greenschist are obtained by using of the Burgers model.The comparison between Burgers model and experimental curves for the Greenschist shows that Burgers model is applicable for determining the viscoelastic rheological parameters of the lateral layer.These parameters are helpful for Jinping II Hydropower Station.

关 键 词：岩石力学 绿片岩 三轴流变试验 卸围压 

分 类 号：TU45[建筑科学—岩土工程]