| 角闪斜长片麻岩流变力学特性研究 |
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| 引用本文： | 蒋昱州,徐卫亚,王瑞红.角闪斜长片麻岩流变力学特性研究[J].岩土力学,2011,32(Z1):339-0345. |
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| 作者姓名： | 蒋昱州 徐卫亚 王瑞红 |
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| 作者单位： | 河海大学岩土工程研究所;长江科学院水利部岩土力学与工程重点实验室;三峡大学三峡库区地质灾害教育部重点实验室 |
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| 基金项目： | 国家自然科学基金资助项目(No.50979030;No.40872192);国家重点基础研究发展计划(973)项目(No.2011CB710603);长江科学院博士科研启动基金(No.CKSQ2010084) |
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| 摘 要： | 为了解小湾水电站枢纽区角闪斜长片麻岩的流变力学特性,采用岩石全自动三轴流变伺服仪对角闪斜长片麻岩进行三轴流变力学试验。试验结果表明,强度较高的角闪斜长片麻岩会发生流变现象,尤其在高应力水平条件下,其流变特性明显;外荷载超过岩样的长期强度时,随着时间的逐渐增加试样变形经历典型流变3个阶段,并最终加速流变破裂。依据岩样稳态流变阶段的流变速率与应力水平的关系,提出了一种确定长期强度的方法。在Burgers流变模型中加入统计损伤,并用Mohr-Coulomb准则确定的岩石长期强度作为开始进入非线性加速流变阶段的阀值,得到相应的非线性损伤流变模型。利用岩石全程三轴流变试验结果,采用优化后的算法,对非线性损伤流变模型相应的参数进行了辨识,结果表明,建立的岩石统计损伤非线性流变变模型与流变试验结果吻合较为理想,可以较为准确地反映角闪斜长片麻岩的流变力学特征。
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| 关 键 词： | 岩石力学 角闪斜长片麻岩 流变 试验研究 |
| 收稿时间： | 2010-11-09 |
Investigation on rheological mechanical properties of hornblende plagioclase gneiss |
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| JIANG Yu-zhou,XU Wei-ya,WANG Rui-hong.Investigation on rheological mechanical properties of hornblende plagioclase gneiss[J].Rock and Soil Mechanics,2011,32(Z1):339-0345. |
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| Authors: | JIANG Yu-zhou XU Wei-ya WANG Rui-hong |
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| Institution: | 1. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China; 3. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Education Ministry, China Three Gorges University, Yichang, Hubei 443002, China |
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| Abstract: | In order to investigate the rheological properties of hornblende plagioclase gneiss in Xiaowan Hydropower Project, triaxial compression rheological experiments for hornblende plagioclase gneiss spceimens are carried out on the rock servo-controlling rheology testing machine. The rheology testing results show that rheological properties of hornblende plagioclase gneiss is very obvious. Based on the triaxial rheological experimental results, the variance law of axial strains of hornblende plagioclase gneiss specimens with the time under different pressures is investigated; and the development trends and characteristics of rock deformation in stage of accelerated rheology are discussed. At the same time, the scanning electron microscopy experiments of rheological rupture fracture are carried out; the rupture forms and mechanisms are analyzed. Based on the relation between creep rate and stress level in the stage of steady-state creep, a new method is put forward to determine long-term strength. Combining statistical damage model and Burgers rheological model, the corresponding damage rheological model is proposed; and then rock statistical damage rheological model is verified by accelerated rheological test curves of rock spceimen. The results show that the rock statistical damage nonlinear rheological model agrees well with the rheology test results, and can exactly describe the rheological properties of hornblende plagioclase gneiss in Xiaowan Hydropower Project. |
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| Keywords: | rock mechanics hornblende plagioclase gneiss rheology experimental investigation |
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