| 深部切顶沿空成巷关键参数研究及工程应用 |
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| 引用本文： | 陈上元,赵菲,王洪建,袁广祥,郭志飚,杨军.深部切顶沿空成巷关键参数研究及工程应用[J].岩土力学,2019,40(1):332-342. |
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| 作者姓名： | 陈上元 赵菲 王洪建 袁广祥 郭志飚 杨军 |
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| 作者单位： | 1. 华北水利水电大学 地球科学与工程学院，河南 郑州 450046；
2. 中国矿业大学（北京）深部岩土力学与地下工程国家重点实验室，北京 100083 |
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| 基金项目： | 国家自然科学基金项目(No. 51479195)；华北水利水电大学高层次人才科研启动项目资助(No. 40655) |
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| 摘 要： | 传统充填沿空留巷工艺繁琐﹑留巷速度慢，与现代化高强度开采要求不相适应，由此提出了切顶沿空成巷无煤柱开采新技术，其中关键参数设计是该技术的核心问题之一，对留巷的稳定性具有较大影响。以城郊煤矿21304工作面为研究背景，采用理论分析、数值模拟和现场试验等方法，对切顶沿空成巷关键参数进行了系统研究。基于岩石碎胀自承特性和围岩结构“S-R”稳定原理，推导出切顶高度﹑切顶角度的理论计算公式；建立了聚能爆破力学模型，并结合数值模拟和现场试验，确定了聚能爆破装药量及钻孔间距。研究结果表明：合理的切顶参数能够切断巷道顶板与采空区岩层间的力学关系，使采空区顶板沿切缝顺利垮落，碎胀的矸石可有效支撑上覆顶板，限制其回转下沉，减弱覆岩运动对留巷的扰动作用，沿空巷道围岩变形量明显减小。根据理论计算﹑数值分析和现场试验研究成果，确定了城郊煤矿21304工作面切顶沿空成巷关键参数，并在现场进行了应用，回采后沿空巷道侧向顶板能够迅速切落形成巷帮，留巷稳定后各项指标均能满足现场使用要求。
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| 关 键 词： | 切顶卸压 沿空留巷 关键参数 数值模拟 工程应用 |
| 收稿时间： | 2017-11-01 |
Determination of key parameters of gob-side entry retaining by cutting roof and its application to a deep mine |
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| CHEN Shang-yuan,ZHAO Fei,WANG Hong-jian,YUAN Guang-xiang,GUO Zhi-biao,YANG Jun.Determination of key parameters of gob-side entry retaining by cutting roof and its application to a deep mine[J].Rock and Soil Mechanics,2019,40(1):332-342. |
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| Authors: | CHEN Shang-yuan ZHAO Fei WANG Hong-jian YUAN Guang-xiang GUO Zhi-biao YANG Jun |
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| Institution: | 1. College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China |
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| Abstract: | The traditional gob-side entry retaining with filling is cumbersome and slow, which cannot satisfy the requirements of modern high-intensity mining. Thus, a non-pillar mining technology by cutting roof is proposed to form a roadway along the empty. However, the design of key parameters is one of core problems of this technology, which has a great influence on the stability of gob-side entry retaining. In this study, theoretical analysis, numerical simulation and field tests are conducted to investigate the key parameters systematically at the 21304 working face of Chengjiao mine. We derive the formulas for the height and the angle of cutting roof by using the self-bearing of bulking rocks and the stability principle (S-R) of surrounding rock. A mechanical model of energy-cavity blasting is established and further used to determine the explosive payload and spacing of borehole in combination with numerical simulation and field tests. The results show that the mechanical relationship between the roof and stratum of mining goaf can be cut off if the designed parameters of cutting roof are proper. Additionally, the roof can collapse along pre-cutting and gangue of bulking rock can support the overlying roof. Moreover, the rotary sinking, disturbance to roadway and deformation of surrounding rock of roadway are all controlled by cutting roof. The key parameters for the 21304 working face of Chengjiao mine are obtained by theoretical calculation, numerical simulation and field tests. The field application indicates that the lateral roof of roadway can be quickly cut down into the roadside after robbing and all indicators can meet the requirements of this site. |
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| Keywords: | pressure relief by roof cutting gob-side entry retaining key parameters numerical simulation engineering application |
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