大岗山坝区岩体现场剪切蠕变试验及参数反演

›› 2011, Vol. 32 ›› Issue (9): 2584-2590.

大岗山坝区岩体现场剪切蠕变试验及参数反演

张强勇¹，陈芳¹，杨文东¹，李文纲²，王建洪²，贺如平²，曾纪全²

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

收稿日期:2011-03-21 出版日期:2011-09-10 发布日期:2011-09-13
作者简介:张强勇，男，1967年生，博士，教授，博士生导师，主要从事岩土与结构工程教学与科研
基金资助:
国家重点基础研究发展计划资助(No. 2009CB724607)；教育部新世纪优秀人才支持计划资助(No. NCET-08-0336)；国家自然科学基金资助项目(No. 40772173)。

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

ZHANG Qiang-yong¹，CHEN Fang¹，YANG Wen-dong¹，LI Wen-gang²，

1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China; 2. Chengdu Hydroelectric Investigation & Design Institute, China Hydropower Engineering Consulting Group Corporation, Chengdu 610072, China

Received:2011-03-21 Online:2011-09-10 Published:2011-09-13

摘要/Abstract

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

关键词: &ldquo, 硬、脆、碎&rdquo, 辉绿岩脉；现场剪切蠕变试验；剪切蠕变模型辨识；剪切蠕变参数反演

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.

Key words: “hard brittle shatter&rdquo, diabase dikes, field shear creep test, shear creep model identification, shear creep parameter inversion

中图分类号:

O 344.6

张强勇，陈芳，杨文东，李文纲，王建洪，贺如平，曾纪全. 大岗山坝区岩体现场剪切蠕变试验及参数反演[J]. , 2011, 32(9): 2584-2590.

ZHANG Qiang-yong ，CHEN Fang ，YANG Wen-dong ，LI Wen-gang ，. Field shear creep test and creep parameters inversion for dam zone rock mass of Dagangshan hydropower station[J]. , 2011, 32(9): 2584-2590.

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