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In situ creep tests on the long‐term shear behaviors of a fault located at the dam foundation of Dagangshan hydropower station, China
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-11-07 , DOI: 10.1002/ese3.521 Wendong Yang 1 , Kang Duan 2 , Qiangyong Zhang 2 , Yuyong Jiao 3 , Shugang Wang 2
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-11-07 , DOI: 10.1002/ese3.521 Wendong Yang 1 , Kang Duan 2 , Qiangyong Zhang 2 , Yuyong Jiao 3 , Shugang Wang 2
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Faults in the rock mass of dam foundation are crucial in controlling dam deformation and stability. In particular, long‐term stability of dam foundation is an important factor for the safety of dam operations. The rock in the foundation of Dagangshan hydropower station is mostly granite, and there are many diabase dikes distributed in granite. Geological survey indicates that many faults exist along the interfaces between granite and diabase. Lots of diabase were metamorphosed to chlorites, which have very low strength. In order to investigate the deformation of faults in diabase dikes under long‐term loading, in situ shear creep tests were performed to estimate the creep performance of a fault. The shear creep displacement and the influence of displacement history of the specimen during multi‐level loading tests were measured and analyzed. The isochronous stress‐strain method was used to determine the long‐term strength of the fault in shear creep tests. Considering the instantaneous damage and strain softening, a new viscoelastic‐plastic softening creep model was proposed to describe the shear creep behavior of the fault. Comparisons confirmed that this creep model is capable of describing the shear creep behavior of the fault and the creep parameters were estimated accordingly using this model.
中文翻译：
大港山水电站坝基断层长期剪切特性的原位蠕变试验
坝基岩体中的断层对于控制大坝的变形和稳定性至关重要。尤其是，大坝基础的长期稳定性是影响大坝运行安全的重要因素。大港山水电站地基中的岩石多为花岗岩，花岗岩中分布着许多辉绿岩堤。地质调查表明，花岗岩与辉绿岩之间的界面上存在许多断层。许多辉绿岩变质为绿泥石，其强度非常低。为了研究在长期荷载下辉绿岩堤防中断层的变形，进行了原位剪切蠕变试验以估计断层的蠕变性能。测量并分析了多级载荷试验期间试样的剪切蠕变位移和位移历史的影响。在剪切蠕变试验中，采用等时应力应变法确定断层的长期强度。考虑到瞬时破坏和应变软化，提出了一种新的粘弹塑性软化蠕变模型来描述断层的剪切蠕变行为。比较证实该蠕变模型能够描述断层的剪切蠕变行为，并使用该模型相应地估计了蠕变参数。
更新日期：2019-11-07
中文翻译：
大港山水电站坝基断层长期剪切特性的原位蠕变试验
坝基岩体中的断层对于控制大坝的变形和稳定性至关重要。尤其是，大坝基础的长期稳定性是影响大坝运行安全的重要因素。大港山水电站地基中的岩石多为花岗岩，花岗岩中分布着许多辉绿岩堤。地质调查表明，花岗岩与辉绿岩之间的界面上存在许多断层。许多辉绿岩变质为绿泥石，其强度非常低。为了研究在长期荷载下辉绿岩堤防中断层的变形，进行了原位剪切蠕变试验以估计断层的蠕变性能。测量并分析了多级载荷试验期间试样的剪切蠕变位移和位移历史的影响。在剪切蠕变试验中，采用等时应力应变法确定断层的长期强度。考虑到瞬时破坏和应变软化，提出了一种新的粘弹塑性软化蠕变模型来描述断层的剪切蠕变行为。比较证实该蠕变模型能够描述断层的剪切蠕变行为，并使用该模型相应地估计了蠕变参数。
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