| 卸围压时含瓦斯煤力学性质演化规律试验研究 |
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| 引用本文： | 赵洪宝,王家臣.卸围压时含瓦斯煤力学性质演化规律试验研究[J].岩土力学,2011,32(Z1):270-274. |
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| 作者姓名： | 赵洪宝 王家臣 |
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| 作者单位： | 中国矿业大学（北京） 资源与安全工程学院，北京 100083 |
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| 基金项目： | 国家自然科学基金项目资助(No.51004110);国家自然科学基金重点项目资助(No.50834005) |
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| 摘 要： | 以固定轴向应变条件下的轴向应力和径向应变为研究参数，对含瓦斯煤卸围压条件下的力学性质演化规律进行了试验研究，并对各参数的演化规律进行了数学拟合。结果表明，固定轴向应变被逐渐卸除含瓦斯煤的围压后，含瓦斯煤的轴向应力呈分2个阶段逐渐减小的趋势，其减小率与围压、瓦斯压力之差呈正向关系；瓦斯压力越大，卸除单位围压后轴向应力降低越大，轴向应力对卸围压效应越敏感，轴向应力与围压卸除量关系可用二次函数形式表征；固定轴压而逐渐卸除围压时，含瓦斯煤的径向应变呈逐渐增大趋势，瓦斯压力越大卸除单位围压后产生的径向应变越大，径向应变的变化是卸除围压量和瓦斯压力之和的综合作用，径向应变与卸除后的围压关系可用修正对数函数表征
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| 关 键 词： | 卸围压 轴向应力 径向应变 演化规律 拟合函数 |
| 收稿时间： | 2010-11-15 |
Experimental study of evolution law of mechanical properties of coal containing gas under unloading confining pressure |
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| ZHAO Hong-bao,WANG Jia-chen.Experimental study of evolution law of mechanical properties of coal containing gas under unloading confining pressure[J].Rock and Soil Mechanics,2011,32(Z1):270-274. |
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| Authors: | ZHAO Hong-bao WANG Jia-chen |
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| Institution: | School of Resources and safety Engineering, China University of Mining and Technology, Beijing 100083, China |
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| Abstract: | Taking axial stress and radial strain under fixed axial strain as study parameters, the evolution law of mechanical properties of coal containing gas under unloading confining pressure is experimentally studied; and the relationship between test conditions and study parameters is fit. The results show: the axial stress of coal containing gas decreased with two stages if confining pressure is gradually unloaded under fixed axial strain; the relationship between decrease rate of axial stress and the difference between confining pressure and gas pressure is positive. The total decrease of axial stress is larger when the confining pressure is unloaded by unit value as gas pressure increasing; and sensitivity of the influence is stronger, the relationship between axial stress and confining pressure unloaded amounts can be show by quadratic function. The radial strain of coal containing gas shows gradually increases tendency when confining pressure is gradually unloaded under fixed axial strain; the total increasing of radial strain is larger when the confining pressure is unloaded by unit value as gas pressure increasing; the variable quantity of radial strain is influenced by sum of the confining pressure unloaded and gas pressure; the relation between radial strain and confining pressure unloaded can be show by modified logarithm function. |
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| Keywords: | unloading confining pressure axial stress radial strain evolution law fitting function |
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