| 基于非接触监测深埋软弱破碎围岩隧洞破坏试验研究 |
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| 作者姓名： | 孙晓明 韩强 缪澄宇 袁帅 苗沛阳 卢昊 |
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| 作者单位： | 1.深部岩土力学与地下工程国家重点实验室,北京100083;2.中国矿业大学(北京)力学与建筑工程学院,北京100083 |
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| 基金项目： | 国家重点研发专项(2016YFC0600901);国家自然科学基金面上项目(51374214) |
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| 摘 要： | 本文以软弱破碎围岩隧洞开展物理模型试验,应用红外成像仪器及高精度位移监测系统两种非接触监测方法,观察分析试验过程中温度场及位移场演化规律及模型破坏机理.通过红外热成像,开挖损伤区伴随全断面开挖的贯通以低温异常区显现.观察损伤区内外测点温度曲线,不同位置随破坏过程的温度变化规律得以显现.通过非接触位移监测提供的位移云图及位移矢量图确定了顶板垮落裂隙的产生机理.裂隙形成并发展至开挖损伤区形成贯通,造成顶板垮落.两种监测手段的结合,合理地分析了模型的破坏机理.
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| 关 键 词： | 软弱破碎围岩 开挖损伤区 红外热成像 位移监测 破坏机理 |
| 收稿时间： | 2016-09-09 |
Modeling test of deep buried tunnel in soft and broken rock based on non-contact monitoring methods |
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| Affiliation: | 1.State Key Laboratory for GeoMechanics and Deep Underground Engineering,Beijing 100083,China;2.School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China |
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| Abstract: | A physical modelling test was carried out based on soft and broken surrounding rock tunnel.The formation and development process of temperature and displacement field were observed by two means of non-contact monitoring methods.The infrared thermal imager and the high-precision displacement monitoring system,the failure mechanism of the model was analyzed.Through the thermal imager,the excavation damage zone(EDZ)turned up in a low-temperature state along with the penetration of the full face excavation.By observing the temperature-time curves of the monitoring points in and out of EDZ,the temperature variation regularity in different area of the model emerged along the test process.The formation mechanism of the cracks which leaded to the destruction of the model was confirmed by the displacement nephogram and vector diagrams provided by the non-contact displacement monitoring.The formation and extension of the cracks connected EDZ and the roof collaps.The failure mechanism was analyzed reasonably by the combination of these two monitoring methods. |
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