| 引用本文: | 孟凡树,王迎超,焦庆磊,王月明,李朝阳.断层破碎带突水最小安全厚度的筒仓理论分析[J].哈尔滨工业大学学报,2020,52(2):89.DOI:10.11918/201810155 |
| MENG Fanshu,WANG Yingchao,JIAO Qinglei,WANG Yueming,LI Zhaoyang.Analysis of the minimum safe thickness of water inrush in fault fracture zone based on the silo theory[J].Journal of Harbin Institute of Technology,2020,52(2):89.DOI:10.11918/201810155 |
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| 摘要: |
| 隧道临近富水断层破碎带时易发生突水突泥灾害,防突岩盘最小安全厚度的确定是关键问题.为此,基于筒仓理论和极限平衡方法,分别建立隧道轴线与掌子面正交和平行时的断层破碎带突水力学模型并且推导防突岩盘所受地应力的计算公式.在此基础上,得出富水断层破碎带突水突泥的力学判据,并分析断层破碎带宽度对防突岩盘最小安全厚度的影响.最后,将理论研究成果应用于永莲隧道和祁连山隧道工程中.理论分析表明:断层破碎带宽度小于200 m时,断层破碎带宽度对防突岩盘最小安全厚度的确定影响显著.经过计算,永莲隧道的防突岩盘最小安全厚度为7.34 m,实际工程中未预留足够安全厚度而发生突水事故；祁连山隧道F6、F7断层破碎带的防突岩盘最小安全厚度分别为10.22和11.59 m,实际工程中预留了12 m顺利通过断层带,表明理论计算值与工程实际比较符合,具有一定的可靠性. |
| 关键词: 隧道工程 富水断层破碎带 突水突泥 筒仓理论 最小安全厚度 极限平衡方法 |
| DOI：10.11918/201810155 |
| 分类号:U45 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(3,2); 徐州市重点研发计划(社会发展)项目(KC18219); 江苏高校“青蓝工程”资助,中国矿业大学实验室开放基金Ⅱ类项目(20180220) |
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| Analysis of the minimum safe thickness of water inrush in fault fracture zone based on the silo theory |
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MENG Fanshu1,2,WANG Yingchao1,2,JIAO Qinglei2,WANG Yueming2,LI Zhaoyang2
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(1.State Key Laboratory for Geomechanics and Deep Underground Engineering (China University of Mining and Technology), Xuzhou 221116, Jiangsu, China; 2.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)
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| Abstract: |
| When a tunnel is near a water-rich fault fracture zone, water and mud inrush disaster easily occurs, where the determination of the minimum safe thickness of water-resistant rock mass is a key issue. Based on the silo theory and the limit equilibrium method, models of water inrush in fault fracture zone were established under the conditions that the tunnel axis is orthogonal and parallel to the tunnel face respectively. The analytic formulas of the water-resistant rock mass influenced by ground stress were obtained. Then, the criterion of water inrush in fault fracture zone was established, and the influence of the width of the fault fracture zone on the minimum safe thickness of the water-resistant rock mass was analyzed. Finally, the research result was applied to the Yonglian tunnel and the Qilianshan tunnel. Results showed that the width of the fault fracture zone had a significant influence on the determination of the minimum safe thickness of the water-resistant rock mass when the width of the fault fracture zone was less than 200 m. The minimum safe thickness of the water-resistant rock mass of Yonglian tunnel was calculated as 7.34 m. Water inrush occurred in Yonglian tunnel due to the insufficient safe thickness. The minimum safe thickness of the water-resistant rock mass value of F6 and F7 faults in Qilianshan tunnel were 10.22 and 11.59 m respectively. In the construction of Qilianshan tunnel, it is safe to pass F6 and F7 faults with 12 m water-resistant rock mass, which indicates that the theoretically calculated value is relatively close to the actual value and has certain reliability. |
| Key words: tunnel engineering water-rich fault fracture zone water and mud inrush silo theory minimum safety thickness limit equilibrium method |
