二滩水电站右坝肩纤闪石化玄武岩软弱岩带流变特性的研究

通过对二滩水电站右坝肩纤闪石化玄武岩软弱岩带的实地调查,并结合室内及现场流变试验结果,建立了该软弱岩带的流变模型——三参数固体模型。应用曲线求参及有限元反演方法获得两组流变参数,并在此基础上对现场岩体的流变参数进行预测,从而确立了该软弱岩带的本构方程。随后,引进金属材料研究领域的成果,利用“转换法”求得各级正应力下的长期抗剪强度,并对现场岩体的长期抗剪强度参数进行了预测。

A STUDY ON THE RHEOLOGICAL CHARACTERISTICS OF THE URALITIZED BASALT WEAK ROCK BAND IN THE RIGHT ABUTMENT OF ERTAN ARCH DAM

Based on the field investigation and the results of laboratory work as well as in-situ rheolog-ical tests, a three-parameter solid model was set up for this weak rock band as it's rheological model.Two sets of rheological parameters were obtained by way of derivation from rheological curve andFEM back-analysis. Then the rheological parameters of in-situ rock mass were predicted and the consti-tutive equation of the weak rock band was established. By introducing the accomplishment in the re-search field of metalic material, a new approch to solve for long-term strength, the transformationmethod, was presented and the long-term shear strengths under each step of vertical stress were ob-tained. Moreover, the parameter of long-term strength of in-situ rock mass was predicted.