Pseudo-three-dimensional experimental study on tunnel face stability in weak and fractured rock mass
-
摘要: 在软弱破碎围岩中进行隧道开挖，往往因岩体应力过大或围岩过分变形而导致开挖面失稳破坏，并引发隧道塌方事故。本文以Ⅳ类破碎围岩为参照对象，首先将其等效为单一均值地层，随后利用相似模型材料对隧道地层进行模拟，并在不同加载模式下再现隧道开挖，研究了开挖面的破坏模式及其渐进破坏特征。结果表明，在缓慢加载模式下，开挖面呈穹顶式塌方，而在快速加载模式下，开挖面呈通天型塌方；隧道开挖后的初期，开挖面上部范围岩体的侧向位移较大，而在后期底部岩体侧向位移迅速增大，并最终形成自下而上的破坏面；隧道开挖后，开挖面前方岩体水平向应力增量最大值位于开挖面上部但靠近隧道中线的位置，而竖向应力增量最大值则始终位于开挖面轮廓的顶部。Abstract: Tunnelling in weak and fractured rock mass will inevitably induce excessive stress or deformation of surrounding rock, which results in tunnel face collapse accidents. In order to understand the failure modes and progressive failure characteristics, the weak and fractured rock mass of grade Ⅳ according to Chinese codes is taken as the reference prototype. This rock mass is firstly equivalent for isotropic continual stratum, and then modeled by similar materials. Subsequently, model tests are carried out to simulate tunnel excavation under different loading modes. The test results show that, the tunnel face collapses in dome-style in the slow loading mode, while in the fast loading mode, it collapses in chimney shape and reaches ground surface. In the initial stage after excavation, the lateral displacement at the upside of tunnel face is relatively large; with the increase of overlying loads, the lateral displacement at the downside of tunnel face grows drastically and forms the final failure face from bottom to top. After tunnel excavation, the position of the maximal horizontal stress increment locats at the upside of tunnel face near the line center, but the location of maximal vertical stress increment lies in the top of tunnel face profile.
-
[1] 邓雄业 , 孔祥金 . 靠椅山隧道大塌方处理 [J]. 公路隧道 , 2001(4): 16 – 20. (DENG Xiog-ye, KONG Xiang-jin. Treatment of Kaoyishan mountain tunnel collapse[J]. Highway Tunnel, 2001(4): 16 – 20. (in Chinese)) [2] 邓良胜 , 宋战平 , 李 宁 . 紫坪铺工程 F3 断层大断面隧洞施工中塌方机理的数值仿真分析研究 [J]. 水利水电技术 , 2002, 33 (11): 30 – 32. (DENG Liang-sheng, SONG Zhang-ping, LI Ning. Numerical simulation and analysis on the large section tunnel collapse mechanism at F3 fault in Zipingpu project[J]. Water Resource and Hydropower Engineering, 2002, 33 (11): 30 – 32. (in Chinese)) [3] MASHIMO H, SUZUKI M. Stability conditions of tunnel face in sandy ground[C]// Centrifuge 98: Proceedings of the International Conference Centrifuge 98. KIMURA T, KUSAKABE O, TAKEMURA J, eds. Tokyo, 1998: 721 – 725. [4] AL HALLAK R. Experimental study of the stability of a tunnel face reinforced by bolts[C]// Geotechnical Aspect of Underground Construction in Soft Ground. Balkema, Rotterdam, 2000: 65 – 68. [5] KAMATA H, MASHIMO H. Centrifuge model test of tunnel face reinforcement by bolting[J]. Tunnelling and Underground Space Technology, 2003(18): 205 – 212. [6] SEO K, DOMON T, NISHIMURA K. Behaviour of a tunnel face reinforced by bolts: Influence of an deviated installation[J]. Tunnelling and Underground Space Technology, 2006(21): 444 – 449. -
期刊类型引用(12)
1. 赵洪宝 ，高璐 ，程辉 ，荆士杰 ，王乐 ，陈超男 . 基于开采高度对工作面覆岩裂隙演化影响的钻孔瓦斯抽采研究. 矿业科学学报. 2024(03): 435-445 . 
百度学术
2. 陈尉，马小晶. 基于SPH法的磨料射流破损混凝土裂纹扩展及损伤分析. 应用力学学报. 2024(04): 916-927 . 百度学术
3. 戎虎仁，曹海云，董浩，王占盛，张佳瑶. 双孔洞倾角对红砂岩强度及其破裂分形特征影响. 公路交通科技. 2024(10): 173-183 . 百度学术
4. 王超圣，蔡俊超，韩书娟，赵耀威. 北山花岗岩声发射特征及破坏模式识别研究. 地下空间与工程学报. 2023(01): 87-94 . 百度学术
5. 范财源，孟范宝，刘金锋. 单轴压缩作用下岩石脆性破裂机制的声发射识别. 中山大学学报(自然科学版)(中英文). 2023(03): 14-24 . 百度学术
6. 尹晓萌，张爱明，王鲁男. 干燥和含水状态下片岩的特征强度与能量演化的各向异性规律及机制. 工程地质学报. 2023(05): 1573-1587 . 百度学术
7. 李江哲，南博文. 基于声发射RA-AF值岩石破裂细观裂纹动态演化特征试验研究. 吉林水利. 2023(11): 1-6 . 百度学术
8. 龚囱，包涵，王文杰，钟文，许永斌，赵奎，曾鹏. 红砂岩破坏过程声发射震源演化规律及其主频特征. 煤炭学报. 2022(06): 2326-2339 . 百度学术
9. 龚囱，赵坤，於鑫佳，赵奎，包涵，王文杰. 红砂岩蠕变声发射分形特征. 金属矿山. 2021(04): 76-82 . 百度学术
10. 郑强强，徐颖，胡浩，钱佳威，宗琦，谢平. 单轴荷载作用下砂岩的破裂与速度结构层析成像. 岩土工程学报. 2021(06): 1069-1077 . 本站查看
11. 龚囱，赵坤，包涵，赵奎，曾鹏，王文杰. 红砂岩蠕变破坏声发射震源演化及其分形特征. 岩土力学. 2021(10): 2683-2695 . 百度学术
12. 辛恒奇，黄艳利，张卫清，吴来伟，欧阳神央，郭亚超，李俊孟. 侧限压缩条件下矸石变形破碎规律及声发射特征研究. 采矿与安全工程学报. 2020(01): 162-168 . 百度学术
其他类型引用(19)
计量
- 文章访问数: 1312
- HTML全文浏览量: 2
- PDF下载量: 658
- 被引次数: 31
下载:
