| 主应力对巷道交岔点围岩稳定性影响研究 |
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| 引用本文： | 赵维生,韩立军,赵周能,孟庆彬,刘海泉.主应力对巷道交岔点围岩稳定性影响研究[J].岩土力学,2015,36(6):1752-1760. |
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| 作者姓名： | 赵维生 韩立军 赵周能 孟庆彬 刘海泉 |
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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 221116；2. 中国矿业大学 煤炭资源与安全开采国家重点实验室，江苏 徐州 221116；3. 西南科技大学 环境与资源学院，四川 绵阳 621000 |
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| 基金项目： | 国家自然科学基金项目（No.51174196，No.51204168，No.51109209）。 |
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| 摘 要： | 为研究主应力对交岔点围岩稳定性的影响，以某矿为工程背景，建立5组交岔点数值计算模型，研究了交岔点开挖前的扰动应力场偏转规律，并引入点安全系数法研究了主应力和交岔角度对交岔点围岩位移场、扰动破碎区的影响规律。研究结果表明：在交岔点开挖之前，交岔点附近围岩的主应力方向发生偏转，偏转后的应力场类型由σh型变为σv型，交岔点开挖过程中围岩受σv型应力场影响；交岔角（α≤90°）越大，交岔点越稳定；交岔角度相同时，新掘巷道轴向较靠近最大水平主应力方向的交岔点更稳定。交岔点现场实测数据验证了研究结果。
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| 关 键 词： | 交岔巷道 围岩稳定性 交岔角度 点安全系数 |
| 收稿时间： | 2014-01-20 |
Influence of principal stress on surrounding rock stability of roadway intersection |
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| ZHAO Wei-sheng,HAN Li-jun,ZHAO Zhou-neng,MENG Qing-bin,LIU Hai-quan.Influence of principal stress on surrounding rock stability of roadway intersection[J].Rock and Soil Mechanics,2015,36(6):1752-1760. |
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| Authors: | ZHAO Wei-sheng HAN Li-jun ZHAO Zhou-neng MENG Qing-bin LIU Hai-quan |
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| Institution: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 2. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China; 3. School of Environment and Resources, Southwest University of Science and Technology, Mianyang, Sichuan 621000, China |
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| Abstract: | To study the influence of principal stresses on the stability of roadway intersection, five numerical models of roadway intersection are developed based on the engineering project in Wujiagou coal mine, and the rotation of the disturbance stress field due to roadway excavation is investigated. By introducing the pointwise safety factor method, the influence of principal stress and the angle of roadway intersection is analyzed on the displacement field and the disturbed broken zone around the surrounding roadway intersection. The results show that the orientation of principal stress in the vicinity of the intersection rotates after the excavation of the main roadway, and thus the stress field changes from σh type to σv type. In addition, during the excavation at the intersection, the surrounding rockmass is influenced by the σv-type stress field, and the surrounding rockmass at the intersection becomes more stable when the intersection angle (α≤90°）increases. At the same intersection angle, the intersection point on the direction of the maximum horizontal principal stress becomes more stable in a newly excavated tunnel. These results are confirmed by the monitoring data at the intersection in Wujiagou coalmine. |
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| Keywords: | roadway intersection stability of rock angle of roadway intersection pointwise safety factor |
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