| 深埋隧道岩爆位置偏转及其微震活动特征 |
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| 引用本文： | 李桐,冯夏庭,王睿,肖亚勋,王勇,丰光亮,姚志宾,牛文静.深埋隧道岩爆位置偏转及其微震活动特征[J].岩土力学,2019,40(7):2847-2854. |
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| 作者姓名： | 李桐 冯夏庭 王睿 肖亚勋 王勇 丰光亮 姚志宾 牛文静 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071；2. 中国科学院大学，北京 100049；
3. 东北大学 深部金属矿山安全开采教育部重点实验室，辽宁 沈阳 110819；4. 中国铁路总公司拉林铁路建设总指挥部，西宁 青海 810007 |
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| 基金项目： | 国家自然科学基金(No. 51621006，No. 41320104005，No. 51509244)；中国铁路总公司科技研究开发计划项目(No. 2017G006-B)。 |
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| 摘 要： | 川藏铁路拉林段控制性工程巴玉隧道,施工过程中岩爆频发且呈现邻近区域岩爆位置不一现象。为此,通过微震监测系统原位观测了岩爆位置偏转过程中的岩体破裂演化规律,进一步探讨了岩爆位置发生偏转的原因。研究结果表明:岩爆位置偏转段两侧微震信息呈不均匀分布特征,微震活动(事件数、能量和视体积等参数)随岩爆偏转向岩爆发生位置集核偏转,两者具有良好的空间相关性。岩爆位置偏转段岩体损伤区及视应力的演化特征说明岩爆位置偏转与局部应力集中区变化相关,应力集中程度大的区域更易发生岩爆。相关研究成果对岩爆位置偏转预警及防治具有一定借鉴和参考意义。
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| 关 键 词： | 深埋隧道 川藏铁路 岩爆 微震监测 偏转 应力集中区 |
| 收稿时间： | 2018-03-28 |
Characteristics of rockburst location deflection and its microseismic activities in a deep tunnel |
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| LI Tong,FENG Xia-ting,WANG Rui,XIAO Ya-xun,WANG Yong,FENG Guang-liang,YAO Zhi-bin,NIU Wen-jing.Characteristics of rockburst location deflection and its microseismic activities in a deep tunnel[J].Rock and Soil Mechanics,2019,40(7):2847-2854. |
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| Authors: | LI Tong FENG Xia-ting WANG Rui XIAO Ya-xun WANG Yong FENG Guang-liang YAO Zhi-bin NIU Wen-jing |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Key Laboratory of Ministry of Education on Safe
Mining of Deep Metal Mines, Northeastern University, Shenyang, Liaoning 110819, China; 4. Lhasa-Nyingchi Railway Construction
Headquarters of China Railway, Xining, Qinghai 810007, China |
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| Abstract: | The Bayu tunnel is a controlled project in Nyingchi-Lhasa section of the Sichuan-Tibet railway. Rockbursts happen frequently, and rockburst locations are different in adjacent areas during the construction process. By using the microseismic monitoring system, the evolution laws of rock mass fracture were observed in situ during the process of rockburst location deflection. In addition, the reasons for the deflection of the rockburst locations were discussed. The results showed that the microseismic information was distributed unevenly on both sides of rockburst location deflection. Meanwhile, all the microseismic activities (the number of events, energy and apparent volume) deflected with the deflection of rockburst location, which indicates that they have an obvious spatial correlation. The evolution laws of apparent stress and excavation damaged zones of rock mass in the deflection location reveal that the deflection of rockburst location is related to the change of local stress concentration area, and the rockburst more easily occurs in the area with larger stress concentration. The results provide significant references for the warning and prevention of the deflection of the rockburst locations. |
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| Keywords: | deep-buried tunnel the Sichuan-Tibet railway rockburst microseismic monitoring deflect stress concentration area |
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