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| 高地应力软弱围岩铁路隧道的衬砌压力 | |
| 引用本文： | 陈志敏,赵德安,李国良,余云燕.高地应力软弱围岩铁路隧道的衬砌压力[J].中国铁道科学,2011,32(6). |
| 作者姓名： | 陈志敏 赵德安 李国良 余云燕 |
| 作者单位： | 1. 甘肃省道路桥梁与地下工程重点实验室,甘肃兰州 730070;兰州交通大学土木工程学院,甘肃兰州730070 2. 兰州交通大学土木工程学院,甘肃兰州730070;西北民族大学土木工程学院,甘肃兰州 730030 3. 中铁第一勘察设计院集团有限公司,陕西西安,710043 |
| 基金项目： | 铁道部科技研究开发计划项目 |
| 摘 要： | 以关角隧道为工程背景,采用开挖应力释放率模型,研究高地应力软弱围岩地质条件下铁路隧道的衬砌压力.基于现场实测地应力和施工监测位移,根据台阶法开挖中存在的空间效应,推算未监测到的坑道周边位移和掌子面前方位移,再采用改进的BP人工神经网络模型预测隧道围岩的最终位移.利用开挖应力释放率模型获得隧道衬砌压力及应力释放规律.该规律与经典围岩特征曲线规律一致,且与工程经验和现场施工状态基本符合.采用FLAC3D软件对该段隧道开挖过程进行三维数值模拟,验证了上述方法在高地应力软弱围岩地质条件下的正确性和合理性.计算结果和模拟结果均表明:由于高地应力软弱围岩和初支效果不佳,使得关角隧道DyK307+ 900处衬砌压力较大,隧道结构处于不利的受力状态. |
| 关 键 词： | 高地应力 软弱围岩 位移 应力释放率 衬砌压力 |
Lining Pressure of Railway Tunnel in High Geostress and Soft Surrounding Rock |
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| CHEN Zhimin,ZHAO Dean,LI Guoliang,YU Yunyan.Lining Pressure of Railway Tunnel in High Geostress and Soft Surrounding Rock[J].China Railway Science,2011,32(6). | |
| Authors: | CHEN Zhimin ZHAO Dean LI Guoliang YU Yunyan |
| Institution: | CHEN Zhimin1,2,ZHAO Dean2,3,LI Guoliang4,YU Yunyan1,2(1.Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province,Lanzhou Gansu 730070,China,2.School of Civil Engineering,Lanzhou Jiaotong University,3.School of Civil Engineering,Northwest University for Nationalities,Lanzhou Gansu 730030,4.China Railway First Survey and Design Institute Group Limited,Xi'an Shaanxi 710043,China) |
| Abstract: | With Guanjiao tunnel as engineering background,the model for calculating the release ratio of excavation stress was adopted to study the lining pressure of railway tunnel under the geological conditions of high geostress and soft surrounding rock.Based on the in-situ measured geostress and construction monitoring displacement,the displacement around the tunnel unable to be monitored and the displacement before tunnel face were calculated according to the space effect in the excavation by benching tunneling ... |
| Keywords: | High geostress Soft surrounding rock Displacement Release ratio of stress Lining pressure |
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