Field shear creep test and creep parameters inversion for dam zone rock mass of Dagangshan hydropower station

ZHANG Qiang-yong; CHEN Fang; YANG Wen-dong; LI Wen-gang

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Field shear creep test and creep parameters inversion for dam zone rock mass of Dagangshan hydropower station

更新时间：2026-06-25

- Field shear creep test and creep parameters inversion for dam zone rock mass of Dagangshan hydropower station
- Vol. 32, Issue 9, (2011)
- 作者机构：
  
  1. 山东大学岩土与结构工程研究中心,济南,250061
  2. 中国水电顾问集团成都勘测设计研究院,成都,610072
- 作者简介：
- 基金信息：
- DOI：
  CLC： O344.6
- Online First：13 September 2011，
  
  Published：2011
- 稿件说明：
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ZHANG Qiang-yong, CHEN Fang, YANG Wen-dong, et al. Field shear creep test and creep parameters inversion for dam zone rock mass of Dagangshan hydropower station[J]. 2011, 32(9).
DOI：

ZHANG Qiang-yong, CHEN Fang, YANG Wen-dong, et al. Field shear creep test and creep parameters inversion for dam zone rock mass of Dagangshan hydropower station[J]. 2011, 32(9). DOI：

摘要

现场剪切蠕变试验是了解岩体剪切蠕变特性的最重要手段。针对大岗山水电站坝区“硬、脆、碎”辉绿岩脉进行了现场剪切蠕变试验，分析了岩体的剪切蠕变变形规律和剪切蠕变速率特性。试验结果表明，在剪应力较小时坝区岩体剪切蠕变仅呈现出减速蠕变和稳态蠕变2个阶段；当剪应力接近屈服强度时，坝区岩体剪切蠕变速率由渐变增长转为突变增长，岩体在短时间内即发生破坏，呈现出加速蠕变特性。恒定正应力下辉绿岩体的稳态流变速率与剪应力之间可用指数关系来表征。根据剪切蠕变试验曲线，进行了岩体剪切蠕变模型辨识。辨识表明，西原模型可以较好反映坝区辉绿岩脉的剪切蠕变特性。通过优化反演获得坝区岩体的剪切蠕变参数，为坝基边坡工程稳定性分析和设计提供了重要的力学依据

Abstract

Field shear creep test is the most important means to understand the shear creep properties of rock mass. Field shear creep tests are carried out for the dam zone “hard brittle shatter” diabase dikes in Dagangshan hydropower station. The deformation law of shear creep and the characteristics of shear creep rates have been analyzed. The test results show that decay and steady creep only occur when shear stress is relatively low; however

the shear creep rate changes from gradual growth to sudden growth when shear stress reaches the yield strength

the rock breaks in a short time and the acceleration creep appears in the process of shear creep test. Under the constant normal stress

the relation expression between steady-state creep rate and shear stress of diabase can be expressed by an exponential equation. According to the shear creep curves of diabase

the shear creep model of rock is identified. The identification results show that Nishihara model could effectively describe the shear creep properties of dam zone diabase dikes. The shear creep parameters are got through the optimized back analysis method

which provides important mechanical parameters for design and construction of slope in dam zone.

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