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含瓦斯软弱煤三轴力学特性试验

ISSN号：1000-582X
期刊名称：重庆大学学报
时间：2013.1.15
页码：103-109
分类：TU452[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044, [2]河南工程技术学校采矿系,河南焦作454000, [3]中国矿业大学北京资源与安全工程学院,北京100083
相关基金：国家自然科学基金项目（51004110）;国家科技重大专项项目（2008ZX05034-002）;国家自然科学基金重点项目（50834005）;中央高校基本科研业务费资助项目（2009QZ03）
相关项目：大型露天煤矿高陡时效边坡稳定性理论研究

关键词：含瓦斯软弱煤, 瓦斯压力, 围压, 经验公式, soft coal containing gas, gas pressure, confining pressure, empirical formula

中文摘要：

以由具有突出倾向的软弱煤制备的型煤试件为研究对象，对围压、瓦斯压力二因素对含瓦斯软弱煤的力学特性影响进行了系统研究。试验结果表明：围压对含瓦斯软弱煤的力学性质具有明显影响，随着围压的增大，含瓦斯软弱煤的压密阶段不明显且三轴强度逐渐增加；围压对含瓦斯软弱煤弹性模量影响不明显，对应力应变曲线形状影响亦不明显。随着瓦斯压力的增加，煤样强度呈减小趋势；围压较小时，含瓦斯软弱煤强度受瓦斯压力影响较显著，而围压较大时影响较小；瓦斯压力对含瓦斯软弱煤的杨氏模量影响不明显，且对煤样进入屈服阶段的变形量影响亦不明显；瓦斯压力对煤样具有显著的力学影响，而且也存在明显的化学作用；含瓦斯软弱煤的应力应变曲线可由二次曲线表征，并认为瓦斯压力影响可归结为等效围压效应。

英文摘要：

Taking briquette specimens composed by soft coal with outbursting trends as research object, systematic research of the influence on triaxial mechanical properties of soft coal containing gas caused by confining pressure and gas pressure is done. The results show that confining pressure can significantly affect mechanical properties of soft coal containing gas, the compression phase of soft coal containing gas is obvious and the triaxial strength is increased gradually as confining pressure is increased; the influence on elastic modulus and shape of stress-strain curve is not obvious. The triaxial strength of soft coal containing gas shows decrease trend as gas pressure is increased; the influence on strength of soft coal containing gas caused by gas pressure is obvious when the confining pressure is smaller, but it is not obvious when the confining pressure is bigger, the influence caused by gas pressure on elastic modulus and deformation of yield step is not obvious; gas pressure has not only obvious mechanical effects, but also have chemical action on soft coal containing gas; stressstrain curve of soft coal containing gas can be expressed by conic, the influence caused by gas pressure can be considered as equivalent confining pressure effects.

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