| 花岗岩力学特性的温度效应试验研究 |
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| 引用本文： | 张志镇,高峰,徐小丽.花岗岩力学特性的温度效应试验研究[J].岩土力学,2011,32(8):2346-2352. |
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| 作者姓名： | 张志镇 高峰 徐小丽 |
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| 作者单位： | 1. 中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008;中国矿业大学力学与建筑工程学院,江苏徐州221116
2. 南通大学建筑工程学院,江苏南通,226019 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目(No.2010CB226804,2011CB201205); 江苏省普通高校研究生科研创新计划资助项目(No.CX10B_134Z); 国家自然科学基金项目(No.50909093,50974125) |
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| 摘 要： | 通过实时高温(常温～850℃)加载和高温(常温～1 200℃)后冷却再加载两种情况下的单轴压缩试验,对不同高温下花岗岩的力学性质进行了研究,分析了两种情况下单轴抗压强度、弹性模量、纵波波速、剪切滑移应变等随温度的变化规律,并研究了热-力耦合效应。研究结果表明:(1)在实时高温加载作用下单轴抗压强度和弹性模量随着温度升高而发生连续劣化;(2)高温作用冷却后再加载,花岗岩在常温～600℃区间峰值强度变化不大,800℃左右岩样强度突然降低;(3)纵波波速随加热温度的升高而逐渐降低;(4)剪切滑移应变在800℃之前相对较小,且变化不大,之后便迅速增大,表现出明显的塑性;(5)提出了热-力耦合因子的概念,并借助其提出了一维非线性热-力耦合本构模型,模型曲线和试验曲线较吻合。
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| 关 键 词： | 岩石力学 高温 热-力耦合因子 力学性质 本构模型 |
| 收稿时间： | 2010-05-04 |
Experimental study of temperature effect of mechanical properties of granite |
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| ZHANG Zhi-zhen,GAO Feng,XU Xiao-li.Experimental study of temperature effect of mechanical properties of granite[J].Rock and Soil Mechanics,2011,32(8):2346-2352. |
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| Authors: | ZHANG Zhi-zhen GAO Feng XU Xiao-li |
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| Institution: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; 2. School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China; 3. School of Architecture and Civil Engineering, Nantong University, Nantong, Jiangsu 226019,China |
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| Abstract: | According to experiments on granite under uniaxial compression at high temperatures (normal to 850 ℃) and after high temperatures (normal to 1 200 ℃) cooling and reloading, the mechanical properties of granite have been researched. The variations of uniaxial compressive strength, elastic modulus, longitudinal wave velocity, cut-slip strain with temperature are analyzed; then the effects of thermo-mechanical coupling are studied. Some results are achieved: (1) The peak strength and elastic modulus decrease continuously at high temperature. (2) Reloading after high temperature, the strength changes little from 25 ℃ to 600 ℃, then decreases suddenly at about 800 ℃. (3) The longitudinal wave velocity decreases gradually as temperature rises. (4) The cut-slip strain is small, and varies little below 800 ℃, then increases rapidly and the granite presents distinct plastic behavior over 800 ℃. (5) Based on the proposed concept of thermo-mechanical coupled factor, one-dimensional nonlinear thermo-mechanical coupled damage constitutive equation is established; and model curves are in agreement with experimental curves. |
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| Keywords: | rock mechanic high temperature thermo-mechanical coupled factor mechanical properties constitutive model |
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