中南大学学报（自然科学版）2013，Vol.44Issue(4)：1587-1595,9.
自然与饱水状态下深部斜长角闪岩蠕变特性
Creep characteristics of plagioclase hornblende rock under natural and water-saturated conditions in deep underground
摘要
Abstract
According to plagioclase-hornblende rock in Jinchuan deep underground mine uniaxial compression creep test results, after selection typical creep curves, it is found that viscoelastic and viscoplastic deformation are significantly less than instantaneous deformation, elastic after-effect is not obvious after unloading. Under 5.1 MPa of uniaxial stress, rock samples show pure elastic properties in natural condition. Under water condition, both instantaneous uniaxial compressive strength σ'b and long-term strength σξx are generally lower than nature condition, σ'∞ approaches deep high underground stress, therefore, under high stress conditions in deep underground, especially joints, fractured rock mass, should pay particular attention to drainage, so as to prevent rock deformation and damage due to long-term strength σ∞ reduction in roadway. Instantaneous elastic and plastic strain εme, εmp increases with stress, but the speed decreases, plastic deformation characteristics becomes more conspicuous in water-saturated condition. Under the same stress, water-saturated condition's creep is higher than that of natural condition, and strain rates are generally faster, two conditions's creep rates all turn stable in 20-30 h, rate curves approach each other with stress increases and micro-cracks compact, rock samples turn into a relative hardening stage. While stress reaches 66.3 MPa, water-saturated condition's strain rates accelerate relatively, curves first move down-left, then back to upper-right, but in natural condition, strain rate curves generally move to upper-right. Finally, in the light of creep data characteristics, empirical equation y=ασk is introduced to fit the experimental data. The results prove that the empirical creep model is correct. The creep experimental research of plagioclase hornblende rock in Jinchuan underground mine can provide effective help for analyzing deep roadway rheological stability and support optimization.关键词
斜长角闪岩/单轴压缩蠕变实验/长期强度/应变速率/蠕变经验模型/回归拟合Key words
plagioclase-hornblende rock/ uniaxial compression creep test/ long-term strength/ strain rates/ empirical creep model/ regression and fitting分类
建筑与水利引用本文复制引用
张春阳,曹平,汪亦显,宁果果..自然与饱水状态下深部斜长角闪岩蠕变特性[J].中南大学学报（自然科学版）,2013,44(4):1587-1595,9.基金项目
国家自然科学基金资助项目(51174228) （51174228）
国家自然科学基金资助项目(10972238) （10972238）
湖南省博士生科研创新立项项目(CX2011B117) （CX2011B117）
长江科学院开放研究基金资助项目(CKWV2012310/KY) （CKWV2012310/KY）
